Why · Essence
Why seagrass matters to fisheries, storms and blue carbon
Seagrass is a flowering marine plant, not seaweed. UNEP says meadows occur in 159 countries, support fisheries, protect coasts and store substantial oceanic carbon.
Seagrass is not seaweed
Seagrasses are flowering plants adapted to life underwater. Their roots and rhizomes anchor into sediment, allowing them to form meadows in shallow coastal waters from tropical regions to the Arctic Circle.
UNEP’s current overview places seagrass in 159 countries across six continents and estimates more than 300,000 square kilometres of known meadow area.
One meadow can connect food, shoreline and climate functions
UNEP says seagrass meadows provide nursery habitat to more than one fifth of the world’s largest 25 fisheries. Dense vegetation also slows water movement and helps reduce wave energy, contributing to coastal protection.
Although seagrass covers only a small fraction of the ocean floor, carbon can accumulate in its biomass and especially in underlying sediments. That is why seagrass is grouped with mangroves and salt marshes in blue-carbon discussions.
Why protection often matters before restoration
Anchoring, trampling, dredging, coastal development, polluted runoff and climate stress can all damage meadows. Restoration can help in appropriate places, but a planted meadow cannot simply replace every ecological function of an established one overnight.
For travellers and coastal businesses, preventing avoidable physical damage is a practical first step.
Before you decide
Keep these five things with you.
- 01Recognise seagrass as a flowering plant
- 02Connect meadow health to nursery habitat
- 03Remember roots and sediment matter
- 04Prevent anchor and trampling damage
- 05Do not use blue-carbon claims as a licence to damage existing habitat
How this story earns trust
Sources, method and relationship—visible.
Each reference is tagged by the geography and authority of the source. Country-specific evidence is never presented as a global rule.
Method
This Essence article uses UNEP’s seagrass overview updated in February 2026 and its February 2026 biodiversity feature. It keeps global figures attributed to UNEP rather than presenting them as Eight June measurements.
Commercial relationship
Independent editorial. No restoration project, carbon-credit seller or tourism operator paid for inclusion.
Correction or improvement
Found a mistake, a missing perspective or a source we should review? Send it to the editorial desk ↗
- 01Seagrass meadows ↗
United Nations Environment Programme. Updated 26 February 2026; global distribution, fisheries, carbon and coastal-protection context.
- 02Five ways often-unheralded seagrasses boost biodiversity ↗
United Nations Environment Programme. 27 February 2026 overview of biodiversity, storm protection and carbon functions.
If this made you pause, pass the blue forward.
Why seagrass matters to fisheries, storms and blue carbon
Ready to share
Made for personal and editorial sharing with Eight June attribution. Facts are shortened for the card; the article carries the full context, method and sources.
Useful questions
Quick answers,
kept specific.
Is seagrass a type of seaweed?
No. Seagrasses are flowering plants with roots, rhizomes, leaves, flowers and seeds adapted to marine life.
Why does seagrass matter to fisheries?
UNEP reports that seagrass meadows provide valuable nursery habitat to more than one fifth of the world’s largest 25 fisheries.