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 ·
The Tidewright Journal
Encyclopedia entries, coastal atlas guides, science explainers, farming know-how and recipes — written by Tidewright’s scientists, engineers, chefs and field crews, and open to everyone.
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 ·
Ocean colour satellites turn faint light reflected from the sea into maps of phytoplankton, sediment and kelp. How the sensors work, what they see — and what they miss.
Dr. Mara Ellison ·

The scaled worm snail (Thylacodes squamigerus) glues its shell to rock, spins a mucus net for food, and grows into living reefs on kelp-bed boulders.
Dr. Theo Nakamura ·
Ocean and climate science communicators turn research into stories the public actually acts on. A guide to the disciplines, employers, portfolios and pay.
Tom Okafor ·
Scientific illustration is real work — field guides, journals, museums and restoration teams all hire ocean illustrators. Skills, training routes, clients and rates.
Tom Okafor ·
Been out of the water for months or years? How to get back into diving safely — refresher courses, pool sessions, gear checks and the gentle first dives back.
Tom Okafor ·

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 ·
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 ·

The ocean is not empty and neither are its rights. Tenure, jurisdiction and Indigenous sea country decide who can claim coastal carbon — before any science does.
Dr. Mara Ellison ·
Sea ice forms, grows and melts on the ocean itself, reshaping light, salt and circulation. How it forms, why algae bloom under it, and what its retreat means for kelp.
Dr. Lena Fischer ·
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 ·
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 ·
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 ·
Sea levels are rising faster than at any time in millennia. What actually drives it — expanding water, melting ice, sinking land — and what it means for coasts and kelp.
Dr. Lena Fischer ·

Sea otters dive 40-90 seconds at a time, all day, in cold water — with the densest fur of any mammal and one of the fastest metabolisms. Here's how the physiology works.
Dr. Mara Ellison ·
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 ·
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 ·
Himanthalia elongata — sea spaghetti — is the Atlantic seaweed that behaves like noodles. How to prep it, plus five recipes from aglio e olio to frittata.
Sofia Andersson ·
From 2013, sea star wasting liquefied stars from Alaska to Mexico and erased the sunflower star, a keystone urchin predator. The science, and the kelp fallout.
Dr. Mara Ellison ·
How satellites derive sea surface temperature from infrared and microwave radiometers, why clouds and fog mask kelp coasts, and how scientists validate SST.
Dr. Lena Fischer ·
From photon to map: the orbits, instruments, processing levels and data products behind satellite sea surface temperature — and how to read an SST map like an oceanographer.
Dr. Lena Fischer ·
Species-by-species iodine ranges, weekly portion math, and the prep tricks (soaking, boiling, dashi steeping) that keep sea vegetables a safe daily habit.
Sofia Andersson ·
Seagrass meadows bury carbon in sediments for centuries to millennia. How the biology works, what is at risk, and where seagrass credits stand today.
Dr. Theo Nakamura ·
How seagrass restoration earns carbon credits: the methodologies that exist, how sediment carbon is measured, permanence risks, and what buyers should ask.
Priya Raman ·