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BQ 3A News > Blog > UK > Increasing seaweed farms pose a possibility to important marine existence
UK

Increasing seaweed farms pose a possibility to important marine existence

February 19, 2025
Increasing seaweed farms pose a possibility to important marine existence
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Seaweed farming is a hastily increasing international trade. As a meals useful resource, it has prime dietary worth and doesn’t want fertilisers to develop. Seaweed supplies treasured habitats for marine existence, takes up carbon and absorbs vitamins, plus it is helping offer protection to our coastlines from erosion.

Most often, seaweeds develop on laborious, rocky surfaces. But, to farm seaweed, possible spaces want to be simply out there and slightly sheltered. That is the place seaweed can develop with restricted possibility of being dislodged by way of waves. Seaweed farms in Asia, in international locations like China and Indonesia, are accountable for greater than 95% of worldwide seaweed manufacturing. Seaweed farms, in particular the ones in Southeast Asia, are repeatedly in the exact same environments the place seagrass meadows thrive. Festival for assets ensues.

Proof presentations that tropical seaweed farms, when positioned in or on most sensible of tropical seagrass meadows results in a decline within the enlargement and productiveness of seagrass. There could also be proof that seaweeds outcompete seagrasses in cooler waters, particularly when vitamins within the water are very prime.

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Seaweed farms are regularly put on most sensible of seagrass meadows.
Niels Boere/flickr

In spite of detrimental interactions, akin to shading, between seaweed and seagrass, some scientists now recommend for an international growth of seaweed farming in spaces the place seagrass grows. This name, comes at a time when seagrass international projects are looking to stem seagrass loss.

Efforts are underway to make bigger those habitats to their as soon as intensive vary to assist struggle local weather exchange and biodiversity loss. Seagrass meadows are a a very powerful retailer of carbon, offering habitats for a big selection of animals.

Satellite image of seaweed farms in Tanzania

Some seagrass meadows in Zanzibar, Tanzania, have recovered since seaweed farms were got rid of.
GoogleEarth

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Why farm seaweed on most sensible of seagrass?

The rationale that some scientists are advocating for farming seaweed in seagrass is that their analysis claims that the presence of seagrass reduces illness inflicting bacterial pathogens by way of 75%. A significant win for a slightly low tech trade the place seaweed illness outbreaks impede manufacturing. Those scientists aren’t the one ones advocating for seaweed manufacturing at scale.

World conservation charities, like Global Natural world Fund and The Nature Conservancy, in addition to the Earthshot prize introduced by way of Prince William all improve seaweed cultivation programmes in spaces more likely to include ample seagrass.

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On the other hand, along with different scientists, we’ve argued in an educational reaction within the magazine PNAS that their declare is untimely. We’re involved that, with out suitable control, those seaweed programmes threaten marine biodiversity and the advantages that people get from the sea.

In spite of ancient and globally standard seaweed cultivation, results on seagrass have most commonly been not noted. The place research exist, results were detrimental for seagrass, its skill to seize carbon, and the various animals that decision it house.

Entanglement of migratory animals, akin to turtles and dugong with seaweed additionally wishes wider attention. That is particularly the case given new felony frameworks to offer protection to their habitat, and there may be ongoing fear for those species being killed by way of seaweed farmers. The fairness of coastal fishing grounds additionally comes into query, as communities that use seagrass for fishing are possibly to lose get right of entry to.

Conservation charities recommend for tropical seaweed farms for excellent explanation why. That is to enhance group resilience within the face of degrading coral reefs and overfishing.

Whilst tasks most commonly have the most efficient intentions, they regularly don’t believe cascading accidental penalties, nor the fairness of the entire group. In fact, seaweed farm placement is successfully comparable to ocean grabbing (the act of dispossession or appropriation of marine assets or areas) with farmers successful on a “first come, first serve” foundation, in spite of now not proudly owning the seabed.

Sustainable requirements

If seaweed farming is to be expanded, requirements for sustainability should be upheld and reinforced. In 2017, a sustainable seaweed usual used to be introduced by way of the Aquaculture and Marine Stewardship Councils.

However few tropical seaweed farms meet the standards defined on this usual because of identified penalties that have an effect on seagrass (rightly outlined in the usual as susceptible marine habitats) and most probably unwanted effects on endangered species, like dugong, that widespread seagrass habitats.

file 20250213 17 njndg.JPG?ixlib=rb 4.1

A ladies prepares seaweed ropes for deployment within the Wakatobi, Indonesia.
Benjamin Jones/Venture Seagrass

Seaweed cultivation methods have combined proof for long-term luck. In Tanzania, many farmers have deserted the trade because of low financial rewards in comparison to the investments they installed, and a few proof means that the process reduces source of revenue and well being, in particular for girls. The place seaweed cultivation has been carried out to cut back fishing power, it has as a substitute higher (and regularly simply displaced) fishing process.

Given the hastily expanding threats confronted by way of tropical marine habitats in spite of the position they play in local weather resilience, figuring out trade-offs prior to huge scale growth of seaweed farming is a concern. To scale back additional any unwanted effects, global programmes and analysis advocating for large-scale seaweed farms want to align extra readily with the seaweed usual.

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