Encyclopedia10 min read
Atlantic Wolffish (Anarhichas lupus): The Shell-Crusher of Cold Reefs
Meet the Atlantic wolffish — a fanged, antifreeze-blooded reef fish that crushes sea urchins and has declined badly from trawl bycatch.
Dr. Theo Nakamura ·
#species-profile
241 articles
Encyclopedia7 min read
Australasian Gannet (Morus serrator): Dive-Bomber of the Kelp Coast
Plunging from thirty metres at highway speed, the Australasian gannet runs the baitfish economies of southern kelp coasts. Meet Morus serrator, the takapu.
Dr. Theo Nakamura ·
Encyclopedia10 min read
Australian Fur Seal (Arctocephalus pusillus doriferus): Species Profile
A species profile of the Australian fur seal, Bass Strait's biggest pinniped — nearly sealed out of existence, now recovering along the kelp coasts of the south.
Dr. Mara Ellison ·
Encyclopedia9 min read
Ballan Wrasse (Labrus bergylta): The Kelp Forest's Cleaning Foreman
Europe's biggest wrasse rules the kelp rocks: nest-building, sex-changing, shell-crushing — and now conscripted onto salmon farms as a cleanerfish. Full profile.
Dr. Mara Ellison ·
Encyclopedia8 min read
Banded Morwong: Tasmania's Banded Elder of the Kelp Reef
The banded morwong is a slow-growing, site-loyal grazer of Tasmania's kelp reefs — a fish that can live for generations and taught fisheries a hard lesson.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Basket Star (Gorgonocephalus eucnemis): Species Profile
Basket stars unfurl branching arms into cold currents to sieve plankton at night. Meet Gorgonocephalus eucnemis, the kelp coast's living gorgon head.
Dr. Mara Ellison ·
Encyclopedia8 min read
Bat Ray (Myliobatis californica): Species Profile
The bat ray is a winged, shell-crushing ray of Pacific bays and kelp edges. Biology, the famous feeding pits, and why divers mistake it for something grander.
Dr. Mara Ellison ·
Encyclopedia8 min read
Bat Star: The Patient Omnivore Cleaning Up Kelp Forest Detritus
The bat star (Patiria miniata) is the kelp forest's web-fingered clean-up crew — a slow omnivore that turns detritus into reef fertility. Facts, ecology, where to see one.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Big Skate (Beringraja binoculata): Species Profile
The big skate is the Pacific's largest skate — a 2.4-metre flatfish-eyed predator of the kelp-edge sands, famous for giant mermaid's-purse egg cases with twins inside.
Dr. Mara Ellison ·
Encyclopedia9 min read
Black-and-Yellow Rockfish (Sebastes chrysomelas): Kelp Bed Homebody with Attitude
The black-and-yellow rockfish holds one crevice for years and defends it with venom-tipped spines — a lesson in how site-attached reef fish live and recover.
Dr. Elias Brandt ·
Encyclopedia8 min read
Black Croaker (Cheilotrema saturnum): The Night Drummer of the Kelp Bed
The black croaker drums after dark in Southern California's kelp beds. How to identify Cheilotrema saturnum, where to find it, and why it sings.
Dr. Mara Ellison ·
Encyclopedia7 min read
Black Surfperch: The Kelp Bed's Plodding Picnicker
The black surfperch (Embiotoca jacksoni) is the thick-lipped, slow-browsing seaperch of California kelp beds — live-bearing, territorial and endlessly photogenic.
Dr. Mara Ellison ·
Encyclopedia7 min read
Black-and-Yellow Rockfish (Sebastes chrysomelas): The Jewel of the Shallow Rocks
The black-and-yellow rockfish is one of the most boldly patterned fish of California's shallow kelp reefs — dark as kelp shadow, patched with shout-yellow.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Blackeye Goby: The Drifting Guard Posts of the Kelp Bed
Pale, black-eyed and hovering nose-down over the reef: how to find, identify and read the blackeye goby, one of the kelp forest's most telling fish.
Dr. Mara Ellison ·
Encyclopedia9 min read
Blacklip Abalone (Haliotis rubra): Australia's Reef-Grazing Giant
The blacklip abalone is southern Australia's largest abalone — a kelp-fed reef grazer that supports one of the world's most valuable wild shellfish fisheries.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Blacksmith: The Damselfish Guarding Kelp Forest Plankton
The blacksmith (Chromis punctipinnis) is the blue-grey damselfish clouding over California kelp beds. Profile: nesting wars, cleaner queues and plankton patrol.
Tom Okafor ·
Encyclopedia9 min read
Blood Star: The Scarlet Slow-Mover of the Lower Reef
Henricia leviuscula, the scarlet blood star of Pacific reefs — smooth-skinned, patient, and able to catch plankton with its stomach. A complete species profile.
Dr. Mara Ellison ·
Encyclopedia8 min read
Blue-Rayed Limpet (Patella pellucida): The Kelp-Grazer with Neon Lines
The blue-rayed limpet lives its whole life on kelp, its shell shot through with living blue light — a profile of Europe's smallest, most beautiful kelp grazer.
Dr. Mara Ellison ·
Encyclopedia7 min read
Brown Rockfish (Sebastes auriculatus): The Dusky Homebody of Shallow Kelp
The brown rockfish is the shallowest of the Pacific rockfish — a dusky, bay-loving homebody of kelp beds, pier piles and eelgrass edges from Alaska to Baja.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Butterfish (Rock Gunnel): The Eel-Like Slip of European Kelp
Pholis gunnellus lives in kelp holdfasts and under tidepool stones, can cross wet rock between pools, and carries a necklace of eyespots down its back.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Cabezon (Scorpaenichthys marmoratus): The Grumpy Guardian of the Reef
The cabezon Scorpaenichthys marmoratus is the largest sculpin on the Pacific coast — an egg-guarding ambush predator of kelp reefs with famously toxic roe.
Dr. Mara Ellison ·
Encyclopedia9 min read
California Mussel: The Rocky Shore's Ecosystem Engineer
Mytilus californianus builds wave-swept mussel beds that shelter hundreds of species. Glue chemistry, keystone starfish, zonation and conservation.
Dr. Mara Ellison ·
Encyclopedia8 min read
California Spiny Lobster (Panulirus interruptus): The Kelp Forest's Clawless Hunter
Panulirus interruptus is the clawless, night-hunting lobster of California kelp reefs — an urchin predator, a famous fishery, and a quiet guardian of the forest.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Canary Rockfish: Comeback Story in Orange and Grey
The canary rockfish went from overfished to rebuilt in fifteen years — one of the US west coast's most instructive fisheries recovery stories.
Dr. Mara Ellison ·
Encyclopedia9 min read
Chain Bladder Kelp: The Canopy With a Rope of Pearls
Cystoseira osmundacea — chain bladder kelp — strings pearl-like floats along California's subtidal rocks. Identification, biology, and why it's no true kelp.
Dr. Mara Ellison ·
Encyclopedia8 min read
Chestnut Cowry: The Polished Alarm Bell of the Reef
Neobernaya spadicea, the chestnut cowry, is the only cowry native to California — a glossy chestnut shell beneath a blazing orange mantle, grazing the reef by night.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Taliepus dentatus: Chile's Kelp Crab and Its Working Fishery
The Chilean kelp crab — jaiba marmola — is a spider-crab grazer of great kelp beds and the centre of a diver-run artisanal fishery. A species and livelihood profile.
Dr. Mara Ellison ·
Encyclopedia9 min read
Lessonia trabeculata: Chile's Huiro and Forests of the Humboldt Coast
Lessonia trabeculata, the huiro, builds Chile's great subtidal kelp forests and feeds a global alginate industry. Biology, fishery, ecology and El Niño risk.
Dr. Theo Nakamura ·
Encyclopedia8 min read
China Rockfish: The Yellow-Spotted Night Watchman
The China rockfish is a small, blue-black, yellow-speckled reef fish that rarely leaves its crevice. Biology, identification, habits and conservation.
Dr. Mara Ellison ·
Encyclopedia9 min read
Cochayuyo (Durvillaea antarctica): The Southern Bull Kelp
Cochayuyo is Chile's great edible bull kelp — a surf-loving brown alga, a market staple and an ocean-going raft. Biology, culture, harvest and rafting ecology.
Dr. Theo Nakamura ·
Encyclopedia10 min read
Common Murre (Uria aalge): The Flying Penguin of Cold Coasts
Meet the common murre, the foot-propelled pursuit diver of kelp-coast upwellings — a flying auk that hunts 100 metres down and raises chicks on bare cliffs.
Dr. Mara Ellison ·
Encyclopedia8 min read
Copper Rockfish: The Long-Lived Reef Resident That Needs Kelp to Hide
The copper rockfish (Sebastes caurinus) is a cryptic, long-lived, home-ranged reef fish of Pacific kelp forests. Biology, fishery history and how it recovers.
Dr. Mara Ellison ·
Encyclopedia10 min read
Coralline Algae: The Pink Concrete That Builds Reefs
Coralline algae are calcified red algae that paint reefs pink, cement them together and decide where young shellfish settle. Forms, ecology and climate risks.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Corkwing Wrasse (Symphodus melops): The Kelp Forest's Nest-Builder
Meet the corkwing wrasse: a small nest-building cleanerfish of Europe's kelp forests, now caught at scale for salmon farms — biology, ID marks, reef role.
Dr. Mara Ellison ·
Encyclopedia10 min read
Crustose Coralline Algae: The Pink Cement That Recruits Kelp Forests
Crustose coralline algae look like pink paint on reef rock, but they are the settlement cue abalone and urchins need. CCA biology and why restoration depends on it.
Dr. Mara Ellison ·
Encyclopedia9 min read
Cystoseira: The Mediterranean's Lost Canopy Forests
Cystoseira and kin built the Mediterranean's underwater forests for millennia. Why these canopy algae are retreating, and what it takes to bring them back.
Dr. Mara Ellison ·
Encyclopedia9 min read
Dall's Porpoise: The Fastest Small Cetacean in the Kelp Latitudes
Dall's porpoise is the slate-and-white speedster of the cold North Pacific, famous for its rooster-tail splash. Biology, range, speed and how to spot one.
Dr. Mara Ellison ·
Encyclopedia8 min read
Dead Man's Bootlace (Chorda filum): The Bootlace Kelp
Chorda filum is a true kelp disguised as a slippery brown string. Where the bootlace kelp grows, how a hollow cord survives a year, and its edible end.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Decorator Crabs: Walking Gardens of the Kelp Reef
Decorator crabs build living costumes from algae, sponges and anemones using velcro-like hairs. How the disguise works, why it evolved and where to see it.
Dr. Mara Ellison ·
Encyclopedia9 min read
Eisenia arborea: The Southern Sea Palm at the Warm Edge
Eisenia arborea, the southern sea palm, is the tree-like kelp of the California–Baja low shore. Profile of its ecology, range shifts and role.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Flat Porcelain Crab (Petrolisthes cinctipes): The Filter-Feeder Under the Rock
The flat porcelain crab packs under Pacific shore rocks by the hundred, sifting plankton with feathery mouthparts and shedding legs it can calmly regrow.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Giant Kelpfish (Heterostichus rostratus): The Shape-Shifting Kelp Mimic
The giant kelpfish changes colour to vanish among kelp blades. Identification, camouflage, behaviour and life cycle of this Southern California clinid.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Giant Keyhole Limpet: The Mantle-Cloaked Gardener
Megathura crenulata, the giant keyhole limpet, cloaks its shell in a living mantle and bleeds blue blood prized by medicine. Identification, diet and reef role.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Giant Red Sea Cucumber: The Forest Floor's Vacuum Cleaner
Apostichopus californicus, the biggest sea cucumber on the Pacific coast, recycles kelp forest sediment from Alaska to California. Biology, defences, fishery.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Goldsinny Wrasse (Ctenolabrus rupestris): The Atlantic Kelp Bed's Small Cleaner
The goldsinny wrasse is the most abundant small wrasse on Europe's kelp coasts — a parasite cleaner, nest guard and aquaculture conscript. Full species profile.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Goose Barnacle: Castaways of the Drift Line
Lepas anatifera spends its life attached to flotsam — kelp rafts, driftwood, plastic. Anatomy, the goose myth, tsunami debris and where to find them.
Dr. Mara Ellison ·
Encyclopedia7 min read
Gopher Rockfish (Sebastes carnatus): Species Profile
The gopher rockfish is a mottled, hole-dwelling resident of California's shallow kelp reefs — sedentary, long-lived and beloved of reef divers.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Graceful Kelp Crab (Pugettia gracilis): The Small Twin of the Kelp Crab World
The graceful kelp crab is the smaller, rougher, more widely wandering sibling of the northern kelp crab — as at home in eelgrass as on a kelp frond.
Dr. Mara Ellison ·
Encyclopedia8 min read
Grass Rockfish: The Kelp Bed's Stealth Hunter
Meet the grass rockfish (Sebastes rastrelliger): a shallow-water ambush predator that barely leaves home — and pays for that loyalty when the pressure comes.
Dr. Mara Ellison ·
Encyclopedia9 min read
Gray Whale (Eschrichtius robustus): The Bottom-Feeder That Navigates by Kelp
Gray whales swim some 10,000 km each way between Arctic feeding grounds and Baja lagoons, hugging the kelp line. Feeding, migration, kelping and survival.
Dr. Mara Ellison ·
Encyclopedia9 min read
Gray Whales and Kelp Forests: The Sentinel of the Coastal Migration
Gray whales hug kelp coastlines for 20,000 kilometres a year — feeding, rubbing and hiding calves in the kelp line. The whale–kelp forest connection, explained.
Dr. Mara Ellison ·
Encyclopedia9 min read
Green Abalone: Life on the Kelp Forest Edge
Haliotis fulgens, the green abalone, is a kelp-trapping herbivore of Baja and southern California. Shell, life cycle, fishery history and recovery.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Green-Lipped Mussel (Perna canaliculus): New Zealand's Famous Shellfish
Endemic to New Zealand, the green-lipped mussel filters big southern water, builds reef — and anchors one of the world's most admired shellfish farms.
Dr. Mara Ellison ·
Encyclopedia9 min read
Green Sea Urchin: The Boreal Grazer That Built the Northern Barrens
The green sea urchin grazes kelp from Norway to Nova Scotia to Alaska. Its biology, the barrens it builds, the roe fishery it feeds, and how reefs recover.
Dr. Mara Ellison ·
Encyclopedia7 min read
Grunt Sculpin: The Fish That Walks on Its Fins and Hides in Barnacles
The grunt sculpin is a thumb-sized fish that walks on its fin rays, hides inside empty barnacle shells and, it seems, impersonates the barnacle itself.
Dr. Mara Ellison ·
Encyclopedia8 min read
Hairy Shore Crab (Hemigrapsus oregonensis): The Quiet Workhorse of Mud and Marsh
The hairy shore crab is the Pacific coast's estuary specialist — bristle-legged, slow-footed and more comfortable in brackish water than its purple cousin.
Dr. Mara Ellison ·
Encyclopedia8 min read
Halfmoon (Medialuna californiensis): The Blue-Silver Kelp Grazer
The halfmoon (Medialuna californiensis) is a blue-grey sea chub that grazes kelp on Southern California and Baja reefs — ID, diet and habitat.
Dr. Mara Ellison ·
Encyclopedia8 min read
Hooded Nudibranch (Melibe leonina): The Canopy's Net-Feeding Slug
The hooded nudibranch Melibe leonina is a translucent sea slug that nets plankton from its perch on kelp blades. Biology, diet and where to see one.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Horn Shark: The Kelp Bed's Armoured Night Specialist
The horn shark is a small, harmless shark that hunts urchins and abalone by night in kelp beds. Biology, the fin spines, the purple teeth, the screw-shaped egg.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Humboldt Penguin (Spheniscus humboldti): The Penguin of the Kelp Coast
The Humboldt penguin breeds in guano caves on the desert coast of Chile and Peru, and fishes in one of the richest — and most changeable — seas on Earth.
Dr. Mara Ellison ·
Encyclopedia9 min read
Irish Moss (Chondrus crispus): The Little Red Alga That Thickened a Century
Irish moss is the small red alga of North Atlantic shores that gave the world carrageenan. Profile: ecology, history, harvest and modern uses.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Kelp Greenling (Hexagrammos decagrammus): Species Profile
Kelp greenling are the kelp forest's most colourful small residents — blue-speckled, sex-changing-looking, nest-guarding. Biology, fishery and where to see them.
Dr. Mara Ellison ·
Encyclopedia8 min read
Kelp Gull: The Southern Hemisphere's Coastal Generalist
The kelp gull is the default large gull of the southern oceans — an adaptable black-backed coastal bird from Cape Town to the Antarctic Peninsula. Full profile.
Tom Okafor ·
Encyclopedia8 min read
Kelp Isopods: The Tiny Pruners Working the Fronds
Kelp isopods graze fouling algae off giant kelp blades — and in boom years can chew through the stipes themselves. Meet the forest's smallest crew.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Kelp Lace Bryozoan (Membranipora membranacea): The White Lattice That Stress-Tests Kelp Blades
Membranipora membranacea skins kelp blades in white lattices of tiny zooids — a grazer, a fouler and, in warm years, a real force in kelp forest loss.
Dr. Mara Ellison ·
Encyclopedia7 min read
Kelp Rockfish: Life Suspended in the Canopy
The kelp rockfish (Sebastes atrovirens) lives in the kelp canopy itself — a mottled, camouflaged hunter: identification, habitat, life history and where to see it.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Spiny Scallop (Chlamys hastata): The Kelp Forest Bivalve That Swims From Predators
The spiny scallop Chlamys hastata is a sponge-armoured, blue-eyed bivalve of Pacific kelp forests that can swim away from sea stars. Full species profile.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Leather Star: The Soft-Skinned Starfish That Eats Anemones
The leather star (Dermasterias imbricata) is a smooth, slippery, garlic-scented sea star that hunts anemones and sea cucumbers — biology, range and how to find it.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Little Penguin (Eudyptula minor): The Smallest Penguin of the Kelp Coasts
About a kilogram of slate-blue determination, the little penguin fishes southern Australia's kelp coasts by day and comes ashore by dark. Meet Eudyptula minor.
Dr. Mara Ellison ·
Encyclopedia9 min read
Long-Spined Sea Urchin (Centrostephanus rodgersii): The Barren-Maker Marching South
The long-spined sea urchin is reshaping Australia's temperate reefs as warming currents carry it south — a species profile of the barren-builder of Tasmania.
Dr. Lena Fischer ·
Encyclopedia9 min read
Lumpfish (Cyclopterus lumpus): The Little Cleaner With a Suction Disc
The lumpfish is a lumpy, suction-bellied cold-water fish that farms raise by the million to eat sea lice off salmon — and its roe fishery is older than you think.
Naomi Reyes ·
Encyclopedia7 min read
Marblefish: The Odd Surgeon of the Southern Kelp
Marbled, thick-lipped and built to crop kelp: the marblefish of New Zealand and southern Australia, a herbivore with the reef's strangest tools.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Monkeyface Prickleback: The Kelp-Eating Eel That Isn't an Eel
The monkeyface prickleback is a long, algae-eating fish of Pacific rockpools — not an eel at all. Biology, the diet switch, and why poke-polers prize it.
Tom Okafor ·
Encyclopedia8 min read
Moonglow Anemone (Anthopleura artemisia): The Buried Anemone of Sand and Rock Seams
Moonglow anemone (Anthopleura artemisia) species profile: the gravel-coated anemone that buries its column in sediment beneath rocks, and how to find it.
Dr. Mara Ellison ·
Encyclopedia8 min read
Morning Sun Star: The Sea Star That Eats Other Sea Stars
With up to sixteen arms and a taste for other sea stars, the morning sun star is the kelp forest's fastest hunter — and a weathervane of sea star wasting.
Dr. Mara Ellison ·
Encyclopedia7 min read
Mossy Chiton: The Eight-Plated Grazer with a Hairy Girdle
The mossy chiton is a surf-swept grazer in eight overlapping plates, its girdle bristling like a tiny hedgehog. Meet Mopalia muscosa of the rocky shore.
Dr. Mara Ellison ·
Encyclopedia10 min read
Northern Abalone: Canada's Pinto, the Endangered Grazer
The pinto abalone is the small, iridescent grazer of the northeast Pacific — endangered since the 1990s and the focus of a careful hatchery recovery effort.
Dr. Theo Nakamura ·
Encyclopedia9 min read
New Zealand Sea Lion (Rāpoka): The Rarest Sea Lion in the Surf
Rāpoka, the New Zealand sea lion, is one of the world's rarest sea lions — a subantarctic breeder slowly recolonising the mainland coast. Its biology and comeback story.
Dr. Mara Ellison ·
Encyclopedia9 min read
Ogonori (Gracilaria): The Agar Weed Behind a Thousand Desserts
Gracilaria sea mosses are among the most farmed seaweeds on Earth and the classic source of agar. Profile of their ecology, culture and cuisine.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Olive Rockfish: The Schooling Midwater Hunter of Kelp Coastlines
Olive rockfish (Sebastes serranoides) school in the dim water above Pacific kelp beds. Profile: ID tips vs kelp rockfish, life history, fishery and role.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Opalescent Nudibranch (Hermissenda crassicornis): Species Profile
The opalescent nudibranch steals stinging cells from its anemone prey and wields them as weapons. Learn to identify Hermissenda crassicornis and its world.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Opaleye: The Blue-Eyed Grazer of the Shallow Kelp
The opaleye is a herbivorous sea chub with opal-blue eyes that shapes California's shallow reefs from tidepools to kelp edges. Biology, diet and ecology.
Dr. Mara Ellison ·
Encyclopedia7 min read
Orange Sea Pen (Ptilosarcus gurneyi): Species Profile
The orange sea pen is a quill-shaped coral colony of the sandy seafloor that retracts into the sediment when touched — and glows when disturbed.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Ornate Cowfish: The Painted Box of the Great Southern Reef
The ornate cowfish (Aracana ornata) carries blue-and-gold armour through southern Australia's kelp and seagrass. A profile of the reef's small Picasso.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Owl Limpet: The Territorial Gardener of the Rocky Shore
Lottia gigantea, the owl limpet, farms a private algae garden on Pacific rocks and bulldozes rivals off it. Biology, territory defence and status.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Pacific Barracuda: The Kelp Forest's Silver Arrow
The Pacific barracuda (Sphyraena argentea) hunts in silver schools over California kelp beds. Profile: biology, range, fishery and how it differs from its tropical cousin.
Dr. Mara Ellison ·
Encyclopedia8 min read
Pacific Bonito (Sarda chiliensis): The Silver Comet Beyond the Canopy
Pacific bonito turn the water beyond the kelp to chrome in warm years. Identification, behaviour, the El Niño connection, and where divers meet these speedsters.
Tom Okafor ·
Encyclopedia8 min read
Pacific Hagfish: The Slimy Deep-Sea Cleaner of the Kelp Coast
The Pacific hagfish (Eptatretus stoutii) is a jawless, knot-tying deep-sea scavenger whose legendary slime and midnight carcass work keep the seafloor clean.
Dr. Mara Ellison ·
Encyclopedia7 min read
Pacific Spiny Lumpsucker (Eumicrotremus orbis): The Kelp Bed's Roundest Resident
How to identify a Pacific spiny lumpsucker: field marks, lookalikes, the suction disc, and where to actually find this walnut-sized kelp bed fish.
Tom Okafor ·
Encyclopedia7 min read
Painted Greenling (Oxylebius pictus): The Small Flash on the Reef
Banded like a convict, tusked in miniature, and perched on the rock: how to find and identify the painted greenling of North Pacific kelp beds.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Painted Topshell (Calliostoma zizyphinum): The Jewel Snail of Kelp Rock
The painted topshell is a glossy, conical grazer of Europe's kelp-bed reefs. How to identify Calliostoma zizyphinum, where it lives and how it feeds.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Pile Perch: The Striped Midwater Browser
The pile perch (Rhacochilus vacca) is the big, deep-bodied seaperch of Pacific kelp forests and pilings — live-bearing, hard-shelled-prey crusher, diver favourite.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Pink Abalone (Haliotis corrugata): The Corrugated Architect of Baja's Kelp Edge
Pink abalone built Baja California's most storied shellfish fishery, then nearly vanished with the kelp. Inside the cooperative-led fight to bring them back.
Dr. Mara Ellison ·
Encyclopedia8 min read
Pinto Abalone: The Northern Grazer Fighting Its Way Back
Hunted to near-collapse, the pinto abalone is being rebuilt by hatcheries and divers in the Salish Sea. Inside North America's meticulous abalone comeback.
Dr. Mara Ellison ·
Encyclopedia9 min read
Plumose Anemone (Metridium): Species Profile
Plumose anemones turn cold kelp-coast rock, wrecks and pilings into white forests of feathery tentacles. Meet Metridium, the towering filter feeder.
Dr. Mara Ellison ·
Encyclopedia8 min read
Pot-Bellied Seahorse: The Big-Bellied Drifter of the Great Southern Reef
Hippocampus abdominalis, the pot-bellied seahorse, is one of the world's largest seahorses — a slow, golden giant of Australian and New Zealand kelp gardens.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Purple-Hinged Rock Scallop: The Reef's Stationary Flash
Crassadoma gigantea, the purple-hinged rock scallop, cements itself to rock for life and filters the kelp forest's currents behind a bright orange mantle. ID and ecology.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Purple Shore Crab (Hemigrapsus nudus): The Red-Spotted Scavenger
The purple shore crab is the little purple scavenger under nearly every rock on Pacific rocky shores — a key cleaner linking the kelp forest to the tide line.
Dr. Mara Ellison ·
Encyclopedia8 min read
Quillback Rockfish (Sebastes maliger): The Patient Kelp-Reef Bass
The quillback rockfish is a long-lived, deep-bodied resident of Pacific kelp reefs — orange-freckled, fiercely site-loyal and one of the slowest fish to grow old.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Rainbow Seaperch (Hypsurus caryi): The Surfperch in Full Colour
The rainbow seaperch is the most colourful fish in California kelp — a live-bearing surfperch in red, blue and gold that gives birth to fully formed young.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Rainbow Star (Orthasterias koehleri): The Red-and-Orange Predator of Kelp Reefs
Rainbow star (Orthasterias koehleri): a red-and-orange sea star of Pacific kelp reefs that eats snails, clams and even small sea urchins.
Dr. Mara Ellison ·
Encyclopedia8 min read
Red Irish Lord: The Sculpin With a Face Only a Reef Could Love
Red Irish lords are mottled, spiny, glued-to-the-rock sculpins that vanish against red algae and barnacles — a masterclass in benthic camouflage.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Red Rock Crab (Cancer productus): The Heavy Hand at the Kelp's Edge
Cancer productus owns the rocky shallows of the Pacific coast: crushing claws, black-tipped pincers, and a quiet role policing urchins. ID, biology, fishery.
Dr. Mara Ellison ·
Encyclopedia8 min read
Red Sponge Dorid (Rostanga pulchra): The Nudibranch That Matches Its Dinner
The red sponge dorid (Rostanga pulchra) lives, feeds and hides on one red sponge — a thumbprint-size lesson in camouflage every tidepooler can find.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Red Turban Snail: The Kelp Grazer That Can Topple a Reef's Balance
The red turban snail (Chlorostoma funebralis) grazes the kelp forest's turf night and day — and when its numbers swing, whole reefs can tilt. A species profile.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Ribbon Kelp (Alaria marginata): The Understory's Golden Streamers
Long brown streamers on the surf-struck low shore: how to identify ribbon kelp, follow its fierce seasonal cycle, and place it among its edible kin.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Rock Wrasse: A Changing Wardrobe on the Kelp Reef
The rock wrasse (Halichoeres semicinctus) changes sex, colour and career over one lifetime on Southern California's kelp reefs – a full species profile.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Rosy Rockfish (Sebastes rosaceus): Species Profile
Rosy rockfish (Sebastes rosaceus) is a small, pink-blotched rockfish of low rocky reefs from Washington to Baja. Identification, habitat, diet and ecology.
Dr. Mara Ellison ·
Encyclopedia8 min read
Rubberlip Seaperch: The Big-Lipped Browser of Kelp and Surf Zones
Rubberlip seaperch (Rhacochilus toxotes) species profile: the largest surfperch, with fleshy lips for picking invertebrates off rocks at the kelp forest edge.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Saithe (Coalfish): The Schooling Hunter of Norway's Kelp Edge
Pollachius virens grows up inside the kelp and hunts beyond it — the dark gadoid whose juveniles fill northeast Atlantic kelp forests every autumn.
Dr. Mara Ellison ·
Encyclopedia9 min read
Eccentric Sand Dollars: The Living Coins on the Kelp Forest Floor
Eccentric sand dollars crowd the sand beside Pacific kelp forests by the thousand — standing on edge to filter the water. Their biology, beds and neighbours.
Dr. Mara Ellison ·
Encyclopedia7 min read
Sarcastic Fringehead: The Mouth-First Homemaker of the Reef
It lives in a shell, it fights with its mouth, and it never backs down. Inside the famous gape-wrestling world of the sarcastic fringehead.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Sargassum horneri: The Floating Invader of the California Kelp Coast
Sargassum horneri arrived in California in the 2000s and spread fast. Profile of the invasive 'devil weed', its ecology, impacts and control.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Sea Bamboo (Ecklonia maxima): South Africa's Giant Kelp
Sea bamboo is the towering hollow-stemmed kelp of South Africa's cold west coast. Biology, range, ecology and harvest of Ecklonia maxima, the Cape's forest builder.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Sea Cabbage: Hedophyllum, the Hand-Size Kelp of the Low Shore
Sea cabbage (Hedophyllum sessile) is a tough, leathery kelp of the wave-washed low intertidal. Its biology, range, ecology and how to identify it on the shore.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Sea Lemon (Peltodoris nobilis): The Citrus-Scented Nudibranch of Northern Kelp Beds
The sea lemon Peltodoris nobilis is a fist-sized, lemon-scented nudibranch that grazes sponges on Pacific kelp reefs. Identification, biology and ecology.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Sea Lemon Nudibranch: How to Tell the Real Sea Lemon from Its Lookalikes
Sea lemons are confused with leopard dorids, the Monterey dorid and the Atlantic sea lemon. A diver's guide to telling the real Peltodoris nobilis apart.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Sea Lettuce: The Opportunist Green of Every Harbour
Sea lettuce (Ulva lactuca): the two-cell-thick green sheet of every harbour — how it grows so fast, why green tides happen, and how it can be put to work.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Sea Palm (Postelsia palmaeformis): The Intertidal Palm Tree Species Profile
The sea palm lives where waves hit hardest — a flexible-stiped kelp that bends with the swell. Its biology, mussel-bed alliance and why foraging it is wrong.
Dr. Mara Ellison ·
Encyclopedia9 min read
Sea Spaghetti (Himanthalia elongata): The Atlantic's Eden of Ribbons
Sea spaghetti grows buttons one year and two-metre straps the next. Where thongweed grows, its odd two-stage life, and why it's the forager's best first kelp.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Sheep Crab (Loxorhynchus grandis): The Giant Spider Crab of California Kelp
The California sheep crab is a slow, spiny giant of the kelp forest floor — a decorator crab that outgrew its disguise. Meet Loxorhynchus grandis.
Dr. Mara Ellison ·
Encyclopedia7 min read
Shiner Surfperch: The Silver Cloud in the Canopy
The shiner surfperch (Cymatogaster aggregata) is the small, schooling seaperch of Pacific kelp beds and piers — a live-bearing forage fish worth knowing.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Shore Crab (Carcinus maenas): Survivor at the Kelp's Edge — and Invader Abroad
Carcinus maenas is Europe's toughest shore crab — a kelp-edge scavenger at home and one of the world's most consequential marine invaders everywhere else.
Dr. Mara Ellison ·
Encyclopedia9 min read
Shovelnose Guitarfish: Half Shark, Half Ray, Fully Kelp-Coast
Pseudobatos productus cruises the sandy flats between kelp forests from California to Baja. How to identify it, what it eats, and why its fate splits at the border.
Dr. Mara Ellison ·
Encyclopedia8 min read
Six-Ray Star (Leptasterias): The Brooding Sea Star of the Kelp Fringe
Leptasterias, the six-rayed star, broods its babies under its own body on the wave-beaten rocks of the Pacific kelp fringe — a small star with a big secret.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Bluntnose Sixgill Shark (Hexanchus griseus): The Deep Giant That Visits Kelp Country
The bluntnose sixgill shark is a primitive deep-water giant that rises along kelp-lined fjords and sounds at night — six gills, green eyes, worldwide.
Tom Okafor ·
Encyclopedia8 min read
Soupfin Shark (Galeorhinus galeus): The School Shark of Kelp Coastlines
The soupfin or school shark once blackened the water over kelp coasts — until a vitamin boom nearly erased it. Meet Galeorhinus galeus.
Dr. Theo Nakamura ·
Encyclopedia10 min read
South American Sea Lion (Otaria byronia): Species Profile
A species profile of the South American sea lion, the maned beachmaster of the Humboldt and Patagonian kelp coasts — biology, range and fishery friction.
Dr. Mara Ellison ·
Encyclopedia9 min read
Southern Bull Kelp (Durvillaea): The Surf-Battered Giant
Southern bull kelp (Durvillaea) grips the roughest surf coasts on Earth with the strongest holdfast of any kelp. Honeycomb blades, Māori pōhā, ocean rafting.
Dr. Theo Nakamura ·
Encyclopedia10 min read
Southern Right Whale: The Whale That Plays in Kelp
The southern right whale is a slow, southern giant with a calloused head — and a documented habit of draping itself in kelp. Its biology, recovery and kelp play.
Dr. Mara Ellison ·
Encyclopedia8 min read
Spanish Shawl (Flabellinopsis iodinea): The Kelp Forest's Flame
The Spanish shawl Flabellinopsis iodinea is a purple-and-orange aeolid nudibranch that steals stinging cells from hydroids. Identification, diet, habitat.
Dr. Mara Ellison ·
Encyclopedia8 min read
Spanish Shawl Nudibranch: Where to Find and Photograph the Kelp Forest's Brightest Slug
Where to find Spanish shawl nudibranchs: the best dive sites and seasons, the hydroid patches they hunt, lookalikes to rule out, and how to photograph one.
Tom Okafor ·
Encyclopedia7 min read
Pacific Spiny Lumpsucker: The Ping-Pong Ball with a Suction Cup
The Pacific spiny lumpsucker is a walnut-sized armoured fish that clamps to kelp and eelgrass with a suction-disc belly. Biology, range, where to look.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Spot Prawn: The Kelp-Edge Delicacy With a Complicated Life
The spot prawn lives half its life male and half female, hides in cold rocky depths, and anchors one of the Pacific's most admired trap fisheries.
Dr. Theo Nakamura ·
Encyclopedia10 min read
Spotted Ratfish (Hydrolagus colliei): The Kelp Coast's Ghostly Chimaera
The spotted ratfish is a deep-bodied chimaera with green eyes, a venomous spine and a forehead clamp — a living fossil that haunts Pacific kelp waters by night.
Tom Okafor ·
Encyclopedia8 min read
Staghorn Sculpin (Leptocottus armatus): Antler-Spined Hunter of Tidal Creeks
The staghorn sculpin cruises Pacific estuaries from Alaska to Baja, tolerates fresh water, and carries venomous antler-like spines on its head.
Dr. Mara Ellison ·
Encyclopedia9 min read
Stalked Kelp (Pterygophora californica): Species Profile
Pterygophora californica grows a woody stipe that stands for decades, sheltering understory life while faster kelps rise and fall around it. Species profile.
Dr. Theo Nakamura ·
Encyclopedia10 min read
Steller Sea Lion: The Tonne of Muscle Above the Kelp Line
The Steller sea lion is the largest of the eared seals — a tonne of muscle-hauling out beside North Pacific kelp forests. Its biology, range and hard-won recovery.
Dr. Mara Ellison ·
Encyclopedia8 min read
Striped Shore Crab (Pachygrapsus crassipes): The Green-Marked Sprinter of the Rocks
Striped shore crab (Pachygrapsus crassipes) species profile: the bold, fast, green-striped crab of Pacific rocky shores — sprinter, grazer and lab superstar.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Striped Surfperch (Embiotoca lateralis): Species Profile
Meet the striped surfperch (Embiotoca lateralis), the copper-striped, blue-flecked surfperch of rocky shores and kelp beds from Alaska to Baja California.
Tom Okafor ·
Encyclopedia8 min read
Stubby Rose Anemone: A Cold-Water Rose of Rock and Cobble
Stubby rose anemone (Urticina coriacea) species profile: a leathery, crimson anemone of northern rock and cobble, from Arctic seas to California kelp forests.
Dr. Mara Ellison ·
Encyclopedia8 min read
Swell Shark (Cephaloscyllium ventriosum): The Inflatable Night Shark
It sleeps all day in kelp-bed crevices, hunts by night, and inflates like a balloon when threatened. Meet the swell shark of the Pacific coast.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Tangle Kelp / Cuvie (Laminaria hyperborea): Europe's Forest-Former Species Profile
Laminaria hyperborea builds the kelp forests of Europe's cold coasts — with stiff stipes standing like an undersea grove. Biology, harvest history, ecology.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Treefish: The Golden Rockfish of California's Kelp
Meet the treefish (Sebastes serriceps) — the tiger-barred golden rockfish of California kelp reefs: identification, habitat, behaviour and conservation.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Turf Algae: The Fuzzy Competitors That Follow the Forest's Fall
Turf-forming algae are the low, weedy mats that move in when kelp forests fall — and can hold a reef in place. A group profile of the kelp forest's most stubborn rival.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Two-Spot Octopus (Octopus bimaculoides): The Kelp Den Neighbour
Octopus bimaculoides is a small den-dwelling octopus of California's rocky kelp reefs, named for the blue-ringed ocelli behind its eyes. Habits and habitat.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Velvet Swimming Crab (Necora puber): Kelp's Red-Eyed Scrapper
Necora puber — red eyes, velvety shell, paddle legs and a famous temper — is the reef's feistiest crab from Norway to Iberia, and a quiet kelp-forest worker.
Tom Okafor ·
Encyclopedia8 min read
Vermilion Rockfish (Sebastes miniatus): Species Profile
The vermilion rockfish is a deep-bodied red rockfish of the mid-water reef zone. Identification, biology, barotrauma and the fishery story.
Dr. Mara Ellison ·
Encyclopedia8 min read
Warty Sea Cucumber: The Reef's Recycling System
Apostichopus parvimensis vacuums detritus off California reefs day and night, cycling nutrients for the whole kelp forest. Biology, defences and the fishery.
Dr. Theo Nakamura ·
Encyclopedia8 min read
White Abalone: How a Deep-Water Drifter Became the First Endangered Marine Invertebrate
The white abalone crashed so fast that by the time it was protected, wild adults were too far apart to breed. Captive breeding is testing a way back.
Dr. Theo Nakamura ·
Encyclopedia10 min read
White Sea Bass (Atractoscion nobilis): The Ghost of the Kelp Forest
The white sea bass is California's great croaker — a metre-and-a-half predator of kelp edge and open water, nearly lost, fighting back. Biology, fishery and comeback.
Dr. Mara Ellison ·
Encyclopedia7 min read
White Sea Urchin (Lytechinus pictus): The Gentle Cousin of the Purple Horde
Pale, decorator-clad and living on open sand rather than reef: how the white sea urchin feeds, spreads and quietly differs from its barren-making relatives.
Dr. Mara Ellison ·
Encyclopedia8 min read
White-Spotted Rose Anemone (Urticina lofotensis): The Kelp Forest's Strawberry
White-spotted rose anemone (Urticina lofotensis) species profile: a scarlet anemone dotted with white, named for Norway's Lofoten islands and common on kelp-coast walls.
Dr. Mara Ellison ·
Encyclopedia9 min read
Yelloweye Rockfish (Sebastes ruberrimus): The Century-Old Resident of the Reef Edge
Yelloweye rockfish can live more than a century on a single reef. Identification, the barotrauma problem, and the rules helping this red giant recover.
Dr. Mara Ellison ·
Encyclopedia8 min read
Black Abalone (Haliotis cracherodii): Species Profile and Recovery
Black abalone once blanketed California's rocky intertidal, then disease and poaching erased most of them. Inside an unlikely marine recovery story.
Dr. Mara Ellison ·
Encyclopedia7 min read
Black Oystercatcher: Sentinel of the Rocky Shore
The black oystercatcher lives its whole life on kelp-fringed rock, hammering limpets and mussels. Ecology, bill lore, breeding and its role as an indicator.
Dr. Mara Ellison ·
Encyclopedia8 min read
Blue Rockfish (Sebastes mystinus): The Schooling Sentinel of Pacific Kelp Forests
The blue rockfish (Sebastes mystinus) is a blue-black schooling mainstay of Pacific kelp forests. Biology, fishery and what its presence tells us.
Dr. Mara Ellison ·
Encyclopedia8 min read
Bluebanded Goby (Lythrypnus dalli): Species Profile
The bluebanded goby is a thumb-length fish in neon red and electric blue, and it can change sex both ways. Meet California's most dazzling reef resident.
Dr. Mara Ellison ·
Encyclopedia9 min read
Brittle Stars of the Kelp Forest: A Group Profile
Brittle stars are the kelp forest's most numerous residents — five-armed floor-dwellers by the thousand. Learn how they differ from sea stars and why they matter.
Dr. Mara Ellison ·
Encyclopedia9 min read
Broadnose Sevengill Shark (Notorynchus cepedianus): Species Profile
Seven gill slits, one rear-set dorsal fin, and fossils deep in its past: the broadnose sevengill is the ancient apex cruiser of temperate kelp coasts worldwide.
Dr. Theo Nakamura ·
Encyclopedia8 min read
California Sea Lion (Zalophus californianus): Species Profile
California sea lions are the kelp coast's most boisterous residents — acrobatic, intelligent and climate-sensitive. Ecology, biology and the Channel Islands nursery.
Dr. Mara Ellison ·
Encyclopedia8 min read
Dungeness Crab: The Kelp-Edge Wanderer With a Famous Name
Dungeness crab species profile: the life cycle from drifting larva to fishing pot, sand-flat and kelp-edge habitat, moulting growth and fishery stewardship.
Dr. Mara Ellison ·
Encyclopedia7 min read
Garibaldi (Hypsypops rubicundus): Species Profile
Meet the garibaldi, California's blazing orange state marine fish — a fiercely territorial damselfish that gardens algae on the kelp forest floor.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Giant Green Anemone (Anthopleura xanthogrammica): Species Profile
The giant green anemone is a solar-powered predator of Pacific tidepools and kelp-forest edges. Its biology, symbiosis and decades-long life.
Dr. Mara Ellison ·
Encyclopedia9 min read
Gumboot Chiton (Cryptochiton stelleri): Species Profile
The gumboot chiton is the world's largest chiton — a hand-long, magnetite-toothed grazer nicknamed the wandering meatloaf. Meet the kelp coast's gentle giant.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Harbour Seal (Phoca vitulina): Species Profile
The harbour seal is the temperate kelp coast's most widespread pinniped — a shy true seal found from California to the Baltic. Facts, ecology and how to watch them.
Dr. Mara Ellison ·
Encyclopedia9 min read
A Field Guide to Kelp Forest Nudibranchs
Nudibranchs are the jewels of the kelp forest: shell-less sea slugs in startling colours. Learn the key groups, the star species and how to find them.
Tom Okafor ·
Encyclopedia8 min read
Leopard Shark (Triakis semifasciata): The Spotted Hunter of Kelp Forest Floors
The leopard shark is a spotted, harmless houndshark of Pacific bays and kelp edges. Biology, behaviour and the famous warm-water aggregations.
Tom Okafor ·
Encyclopedia9 min read
Lingcod (Ophiodon elongatus): Species Profile
The lingcod is not a cod at all — a big-headed, voracious ambush predator of Pacific kelp reefs, famous for blue-green flesh and fiercely guarded nests.
Dr. Mara Ellison ·
Encyclopedia7 min read
Orange-Peel Nudibranch: A Hand-Sized Hunter of Sea Pens
Tochuina tetraquetra, the orange-peel nudibranch, is one of the world's largest sea slugs — a cold-water giant that hunts sea pens and smells faintly of watermelon.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Pāua (Haliotis iris): New Zealand's Iconic Abalone
Pāua, New Zealand's iridescent abalone, is a taonga species, a prized kaimoana and a carefully managed fishery. Its biology and cultural story.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Red Abalone (Haliotis rufescens): Species Profile
Meet the world's largest abalone — a kelp-eating giant sea snail of the Pacific coast. Its biology, fishery history and the road to recovery.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Sieve Kelp (Agarum clathratum): The Perforated Puzzle of the Arctic Reef
Sieve kelp (Agarum clathratum) wears a blade full of holes nobody has fully explained — biology of this Arctic kelp and the riddle of the holes.
Dr. Mara Ellison ·
Encyclopedia9 min read
Southern Rock Lobster (Jasus edwardsii): Species Profile
Southern rock lobster (Jasus edwardsii) is the reef's top urchin predator. Its biology, fishery and role in stopping barrens — a species profile.
Dr. Mara Ellison ·
Encyclopedia9 min read
Stalked Tunicates and Sea Squirts of the Kelp Forest: A Group Profile
Sea squirts look like alien machinery but land among our closest living relatives. Meet the stalked tunicates of kelp understories — anatomy, role and invaders.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Sunflower Sea Star (Pycnopodia helianthoides): Species Profile
The sunflower sea star was the kelp forest's great urchin hunter. Wasting disease erased billions of them — and the consequences reshaped coastlines.
Dr. Mara Ellison ·
Encyclopedia7 min read
Tiger Rockfish: The Banded Hermit of Deep Reef Edges
The tiger rockfish is a long-lived, vividly banded Pacific rockfish of deep rocky reefs and deep kelp-forest edges — beautiful, slow-growing and easily overlooked.
Dr. Mara Ellison ·
Encyclopedia8 min read
Wavy Turban Snail (Megastraea undosa): Species Profile
The wavy turban snail is the big, armoured grazer of southern California kelp forests — a hand-sized shell with a built-in door and a small fishery of its own.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Winged Kelp (Alaria esculenta): The Edible Kelp Growing on Exposed Reefs
Winged kelp (Alaria esculenta) is the wave-exposure specialist of Atlantic shores — and a mild, edible kelp. Its biology, range and kitchen appeal.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Wolf Eel (Anarrhichthys ocellatus): Species Profile
The wolf eel is not an eel and nothing to fear — a devoted, den-dwelling wolffish that crushes sea urchins for a living and guards its eggs for months.
Dr. Mara Ellison ·
Encyclopedia8 min read
Acid Kelp (Desmarestia): The Seaweed That Carries Its Own Acid
Acid kelp (Desmarestia) stores battery-strength acid inside its own cells — the strangest chemical defence in the kelp forest.
Dr. Theo Nakamura ·
Encyclopedia7 min read
California Moray: The Kelp Reef's Patient Ambusher
Meet the California moray eel — a nocturnal, crevice-dwelling ambush predator of Pacific kelp reefs, with pharyngeal jaws and a reputation it doesn't deserve.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Clown Dorid: The Polka-Dotted Grazer of the Kelp Reef
Clown dorid (Triopha catalinae) species profile: identifying the polka-dotted nudibranch, its bryozoan diet, rhinophores and where to find it on kelp reefs.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Feather Boa Kelp (Egregia menziesii): Species Profile
Feather boa kelp streams from Pacific rocks in long, lacy straps, and shelters its own miniature rainforest of life. How to identify, where it grows, what eats it.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Marbled Murrelet: The Seabird That Nests in Trees
The marbled murrelet feeds in kelp-fringed seas and nests miles inland on old-growth limbs. The ecology of a seabird split between two vanishing worlds.
Dr. Mara Ellison ·
Encyclopedia8 min read
New Zealand Fur Seal (Arctocephalus forsteri): Species Profile
Kekeno — the New Zealand fur seal — was hunted nearly to extinction by the early 1800s, then recovered under protection. Ecology, biology and where to see them.
Dr. Mara Ellison ·
Encyclopedia8 min read
Pacific Electric Ray: Fifty Volts in the Kelp Forest's Sand Channels
Tetronarce californica, the Pacific electric ray, carries up to ~50 volts in its wings. Biology, the ambush, and what to do if you meet one on a night dive.
Dr. Mara Ellison ·
Encyclopedia6 min read
Rockweed Gunnel: The Fish That Turns Into Rockweed
The rockweed gunnel is a slender Pacific shore fish so perfectly matched to seaweed butter and olive tones that it looks like the rockweed itself.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Spotted Kelpfish (Gibbonsia elegans): A Master of Disguise in the Canopy
Red in red algae, green in surfgrass, spotted all over — the spotted kelpfish rewrites its own wardrobe to match the kelp it hides in. How to know one.
Dr. Theo Nakamura ·
Encyclopedia6 min read
Umbrella Crab: Kelp's Shape-Shifting Hermit of the Canopy
The umbrella crab hides its legs beneath a flared, kelp-coloured carapace, drifting undetected across the holdfasts and rocky floors of Pacific kelp forests.
Dr. Mara Ellison ·
Encyclopedia7 min read
Weedy Seadragon (Phyllopteryx taeniolatus): Species Profile
Australia's weedy seadragon drifts through kelp like fallen seaweed come alive. Discover its camouflage, male egg-brooding, range and conservation.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Dulse (Palmaria palmata): Species Profile
Dulse is the red seaweed the North Atlantic has snacked on for a thousand years — protein-rich, bacon-savoury when fried, and stranger in its life cycle than you think.
Sofia Andersson ·
Encyclopedia8 min read
Fish-Eating Anemone: The Velvet Trap Beneath the Kelp
Fish-eating anemone (Urticina piscivora) species profile: the big red anemone that catches fish under the kelp canopy and doubles as sea star prey.
Dr. Mara Ellison ·
Encyclopedia8 min read
Five-Ribbed Kelp (Costaria costata): The Wide Blade of the North Pacific
Five-ribbed kelp (Costaria costata) is the wide, ripple-edged kelp of northeast Pacific reefs — biology, kitchen uses and how it differs from wakame.
Dr. Mara Ellison ·
Encyclopedia8 min read
Kelp Bass (Paralabrax clathratus): Species Profile
Kelp bass — calico bass to the anglers who love them — are the signature sportfish of the kelp canopy. Biology, slow growth, sex change and sustainable fishing.
Dr. Mara Ellison ·
Encyclopedia7 min read
Leafy Seadragon (Phycodurus eques): Species Profile
The leafy seadragon is the most perfectly disguised fish in the sea. Explore its South Australian strongholds, brooding males and fragile future.
Dr. Mara Ellison ·
Encyclopedia9 min read
Nori (Pyropia and Porphyra): The Sushi Seaweed Species Profile
Nori comes from red algae with a decades-long life-cycle mystery — solved in 1949 by a British phycologist whose discovery built an entire industry.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Northern Kelp Crab (Pugettia producta): Species Profile
The northern kelp crab is a colour-changing spider crab that lives its whole life in the kelp canopy. Learn its biology, diet, and role in the forest.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Pacific Tube Anemone: The Flower of the Forest's Sandy Floor
The Pacific tube anemone isn't a true anemone at all. Meet Pachycerianthus fimbriatus: the felt-tubed, double-crowned ambush fisher of kelp-forest sand flats.
Dr. Mara Ellison ·
Encyclopedia7 min read
Reef Surfperch (Micrometrus aurora): The Surf Zone's Quiet Resident
Small, barred and easy to overlook, the reef surfperch works the noisy seam where kelp forest meets breaking surf — and gives birth to fully formed young.
Dr. Mara Ellison ·
Encyclopedia8 min read
Aggregating Anemone: The Clone Army of the Rocky Shore
Aggregating anemone (Anthopleura elegantissima) species profile: clonal armies, tentacle wars, symbiotic algae and survival at the top of the rocky shore.
Dr. Mara Ellison ·
Encyclopedia8 min read
California Sheephead (Semicossyphus pulcher): Species Profile
The California sheephead is a sex-changing kelp-forest wrasse whose jaws keep sea urchins in check. Learn its life history, role and recovery story.
Dr. Mara Ellison ·
Encyclopedia7 min read
Elk Kelp (Pelagophycus porra): Species Profile
Elk kelp grows deep, in clear water, with a single antlered float the size of a grapefruit. The deep edge kelp of the Channel Islands and Baja — biology and status.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Kina (Evechinus chloroticus): New Zealand's Endemic Sea Urchin — Species Profile
Kina is Aotearoa's endemic sea urchin — treasured kaimoana, a kelp grazer, and the engineer behind New Zealand's barren reefs. Here is its biology and its story.
Dr. Mara Ellison ·
Encyclopedia9 min read
Kombu (Saccharina japonica): Species Profile
Kombu is the kelp behind dashi and the backbone of the world's seaweed farms. Learn its biology, life cycle, Hokkaido roots and future in a warming sea.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Northern Clingfish (Gobiesox maeandricus): The Living Suction Cup of the Kelp Coast
The northern clingfish grips rough rock with a suction disc no engineered cup can match. Meet the small fish that surfs storm surge under stones and holdfasts.
Dr. Elias Brandt ·
Encyclopedia7 min read
Painted Anemone (Urticina crassicornis): A Cold-Water Polyp in Living Colour
Urticina crassicornis, the painted or Christmas anemone of North Pacific kelp reefs: identification, diet, reproduction and its place in the cold-water forest.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Purple Sea Urchin (Strongylocentrotus purpuratus): Species Profile
The purple sea urchin turned patches of California kelp forest into barrens. Learn its biology, its hidden hunger, and why it is both villain and victim.
Dr. Mara Ellison ·
Encyclopedia8 min read
Red Sea Urchin (Mesocentrotus franciscanus): Species Profile
The red sea urchin can live a century, grows to dinner-plate size, and feeds the uni trade. Meet the kelp forest's most venerable grazer — and its fishery.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Sea Otter (Enhydra lutris): The Keystone That Holds Kelp Forests Together
Sea otters eat a quarter of their body weight a day — much of it sea urchins. How this small predator became the kelp forest's most famous keystone species.
Dr. Mara Ellison ·
Encyclopedia8 min read
Starry Flounder: The Flatfish That Walks Between River and Reef
The starry flounder is the North Pacific's most river-loving flatfish, banded in orange and black. How to identify it, where it hunts, and why estuaries need it.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Wakame (Undaria pinnatifida): Edible Native and Global Invader
Wakame is a beloved edible kelp in Japan and Korea — and one of the world's most widespread invasive seaweeds. Understand both sides of Undaria pinnatifida.
Dr. Mara Ellison ·
Encyclopedia8 min read
Giant Sea Bass (Stereolepis gigas): Species Profile and Comeback
The giant sea bass is a 250-kilo shadows-and-kelp predator that fishermen nearly erased. Learn its biology, the crash and the slow comeback now unfolding.
Dr. Mara Ellison ·
Encyclopedia8 min read
Giant Sea Bass (Stereolepis gigas): The Gentle Giant of the Kelp Forest
In one generation, gillnets erased the giant sea bass from its kelp forests. Four decades of protection are bringing it back — one cautious shadow at a time.
Dr. Mara Ellison ·
Encyclopedia7 min read
Furry Hermit Crab (Paguristes ulreyi): The Kelp Forest's Shell-Swapping Scavenger
Paguristes ulreyi, the furry hermit crab of Pacific kelp forests: how to identify it, why it wears hydroid-covered shells, and its role on the reef floor.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Giant Kelp (Macrocystis pyrifera): Species Profile
Giant kelp is the fastest-growing organism on Earth and the architect of undersea forests. Learn its biology, life cycle, range and why it matters.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Spiny Sun Star: A Cold-Water Many-Armed Opportunist
The spiny sun star is a many-armed predator of cold reefs in both northern oceans. How to identify Crossaster papposus, what it eats, and why it matters.
Dr. Mara Ellison ·
Encyclopedia8 min read
Señorita (Oxyjulis californica): The Kelp Forest Cleaner Wrasse
The señorita is a small California wrasse that runs cleaning stations, swarms in glittering schools and buries itself in sand at night. Meet the kelp forest's hygienist.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Plainfin Midshipman: The Fish That Sings All Night Under the Kelp Coast
Porichthys notatus hums for hours to woo mates, glows with borrowed light and survives hours out of water. Meet the kelp coast's oddest neighbour.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Sharpnose Crab (Scyra acutifrons): The Decorator That Gardens Its Own Back
Meet the sharpnose crab — a small Pacific spider crab that plants living algae on hooked hairs across its shell. How the disguise works and where to find it.
Dr. Mara Ellison ·
Encyclopedia7 min read
Walleye Surfperch (Hyperprosopon argenteum): Silver Flashes in the Kelp Surge
Identifying the walleye surfperch: the big-eyed, silver schooler of kelp edges and sand flats, and a member of the ocean's great live-bearing family.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Heart Crab (Phyllolithodes papillosus): The Boxy Reef Hermit-Relative
Meet the heart crab — a flattened, heart-shaped California reef crab that is not a true crab at all, but a king-crab relative descended from hermit ancestors.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Pacific White-Sided Dolphin: The Kelp Coast's Acrobat
Meet the Pacific white-sided dolphin — the torpedo-striped, bow-riding acrobat of North Pacific kelp latitudes, from BC's inshore passages to Monterey Bay.
Dr. Mara Ellison ·
Encyclopedia7 min read
Rainbow Surfperch (Hypsurus caryi): The Most Colourful Perch on the Coast
How to identify the rainbow surfperch: pattern by pattern, season by season — and where to find this coral-coloured fish among the kelp beds and wharves.
Tom Okafor ·
Encyclopedia8 min read
Sailfin Sculpin: The Kelp Forest Fish That Waves a Flag Fin
The sailfin sculpin is a banded-eye, flag-finned reef fish of the North Pacific — famous for the courtship wave of its tall sail-like first dorsal fin.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Northern Elephant Seal: Deep Divers of the Kelp Coast
Northern elephant seals dive farther than almost any mammal and came back from near-extinction. Learn their biology, haul-outs and recovery story.
Dr. Mara Ellison ·
Encyclopedia7 min read
Graceful Crab: The Slender Scuttler of Kelp Country
Graceful crab species profile: the slim Metacarcinus gracilis of eelgrass, bays and kelp edges — how to tell it from a small Dungeness, and its estuary role.
Dr. Mara Ellison ·
Encyclopedia7 min read
Crevice Kelpfish (Gibbonsia montereyensis): The Shape-Shifter of the Holdfasts
The crevice kelpfish can turn from red to brown to match the algae it hides in. Meet the small, coiled shape-shifter living inside the kelp forest's foundations.
Dr. Elias Brandt ·
Encyclopedia8 min read
Mosshead Warbonnet: The Eel-Like Hider of Rocky Reefs
The mosshead warbonnet is a moss-fringed, eel-like prickleback of North Pacific reefs — a shy, hole-loving specialist of kelp-bed cracks and crevices.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Helmet Crab: The Armoured Bristle of the North Pacific
Helmet crab species profile: the saw-edged, bristled Telmessus cheiragonus — a night-roaming burrower of kelp coast sand from Alaska to Japan.
Dr. Mara Ellison ·
Encyclopedia8 min read
Pelagic Cormorant: The Slim Diver of the Kelp Line
Learn to identify the pelagic cormorant (Urile pelagicus), the smallest North Pacific cormorant, and how it hunts small fish along kelp forest edges.
Tom Okafor ·
Encyclopedia8 min read
Scalyhead Sculpin: The Little Fish with the Fancy Headwear
The scalyhead sculpin is a tassel-headed, fully scaled cottid of Pacific kelp beds — a small ambush hunter whose males turn crimson over guarded egg masses.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Brown Irish Lord: The Red-Bellied Sculpin of Cold Reefs
The brown Irish lord is a spiny, red-bellied sculpin of North Pacific reefs — a camouflaged ambush hunter of crabs and shrimps from Alaska to California.
Dr. Theo Nakamura ·
Encyclopedia9 min read
Ocean Sunfish (Mola mola): The Ocean's Heaviest Bony Fish
Meet Mola mola, the heaviest bony fish on Earth — a flattened, fin-flapping giant that visits kelp coasts to be cleaned, bask and feed on drifting gelata.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Brooding Anemone: The Mother Who Carries Her Young on Her Own Skin
Brooding anemone species profile: protandric hermaphrodite, live-bearing parent, epiphyte of kelp and eelgrass — and a dispersal puzzle solved by rafting.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Turkish Towel: The Red Seaweed with a Surface Like Corduroy
Turkish towel species profile: the rough-textured red alga of surf-swept Pacific rocks, its carrageenan chemistry, life cycle and kelp-forest role.
Dr. Theo Nakamura ·
Encyclopedia7 min read
Greenbone (Odax pullus): New Zealand's Kelp-Eating Butterfish
The greenbone — also called butterfish — is New Zealand's own kelp grazer, a beak-toothed odacid that changes sex, varies in colour, and moves kelp energy into fish.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Striped Trumpeter (Latris lineata): Tasmania's Reef Icon
The striped trumpeter is Tasmania's celebrated hand-line fish — a kelp-reef juvenile, a deep-reef adult, and a lesson in how long-lived fish repay patience.
Dr. Mara Ellison ·
Encyclopedia7 min read
Herring Cale (Olisthops cyanomelas): Southern Australia's Kelp Mower
The herring cale is a cigar-shaped, beak-toothed herbivore that grazes kelp across the Great Southern Reef — and moves its energy up the food web.
Dr. Theo Nakamura ·
Encyclopedia8 min read
Western Blue Groper (Achoerodus gouldii): Species Profile
Meet the western blue groper — Western Australia's giant blue wrasse of the kelp reefs, an urchin-eating patriarch that can live more than half a century.
Dr. Mara Ellison ·
Encyclopedia9 min read
Golden Kelp (Ecklonia radiata): Species Profile
Golden kelp forms the backbone of Australia's Great Southern Reef. Learn to identify Ecklonia radiata and why this habitat-maker is on the move as oceans warm.
Dr. Mara Ellison ·