Field Notes8 min read
Field Notes, Tasmania: First Light on the Holdfast Lines
A Tidewright field note from Maria Island, Tasmania: deploying Holdfast seed lines onto heat-struck reef at dawn, and what we found three months on.
Jack Callum ·
Project 1 · Southern Ocean
Lumeriah Coast
East Coast Tasmania · Australia
Tidewright’s first and largest program: re-seeding the giant kelp forests that once stretched unbroken down Tasmania’s east coast.
- Status
- Scaling
- Launched
- 2019
- Hectares seeded
- 940
- Program target
- 1,600 ha
- Program lead
- Dr. Mara Ellison
Progress to target
59%
Illustrative program figures, part of Tidewright’s fictional record.
The program
The story so far.
The Lumeriah Coast is where Tidewright learned its trade. When the program began, diver surveys found reefs that had flipped almost entirely to urchin barren after a run of marine heatwaves — bare rock where three-storey kelp canopy had stood within living memory.
Holdfast lines carrying heat-selected giant kelp genotypes went into the water in the autumn of 2019, laid by hand from dive boats before the first Drifter hulls were ready. Canopy Ledger’s first satellite canopy maps were drawn over these same coves.
Today the Lumeriah program is Tidewright’s proving ground and its reference ecosystem: the barrens are retreating, juvenile abalone are back in the quadrats, and the program’s monitoring record underpins the company’s entire verification methodology.
Species of the reef
- Giant kelpMacrocystis pyrifera
- Eastern blue groperAchoerodus viridis
- Weedy seadragonPhyllopteryx taeniolatus
Partners on the water
- Marrawah Coastal Council
- Kudjela Sea Country Rangers
- Institute for Marine Futures (fictional)
Milestones
The record, season by season.
2019
First Holdfast lines seeded by hand across 40 ha of barren reef.
2020
First satellite-verified canopy: 32 ha, the proof investors asked for.
2022
Drifter D-3 joins the fleet; seasonal seeding capacity triples.
2023
First blue-carbon credits from the program issued to buyers.
2025
940 ha seeded; canopy verified across 17 of 22 original barrens.
From the Journal
Field notes from this coast.
Field Notes8 min read
Field Notes: Week One Seeding the Tinderbox Reefs
Tidewright's field crew logs their first week seeding Holdfast lines at Tinderbox, Tasmania — survey dives, southerly swells, and 40,000 metres of seeded line.
Jack Callum ·
Field Notes8 min read
Field Notes: First Canopy at Stumpy's Bay
Seven months after seeding, the first kelp canopy breaks the surface at Stumpy's Bay. Tidewright's crew logs the milestone — and what it actually means.
Jack Callum ·
Work near this coast?
Councils, fisheries, dive operators and community groups — every Tidewright program runs on local partnership.
Tidewright is a fictional company created as a design and content demonstration.