August 15, 2022


Companies to grow seaweed in South Australia-based trial on cutting fish farming's carbon emissions



Clean Seas, an aquaculture company, is growing seaweed to reduce the environmental impact of fish farming and livestock, and is working with another aquaculture company, CH4 Global, to grow asparagopsis seaweed at its Arno Bay, South Australia site as part of the trial.


Asparagopsis can absorb excess carbon and nitrogen waste from fish farms and reduces cattle methane emissions when added to their feed.


Clean Seas chief executive Rob Gratton said growing asparagopsis alongside kingfish farms could make red meat and aquaculture more sustainable. "This is about the future of sustainable aquaculture and the future of feeding the world," he said. "We can offset some of the environmental footprint of kingfish farming and produce a product that helps another industry achieve its environmental credentials."


Asparagopsis is estimated to reduce carbon emissions from cattle by up to 90% when added to feed.


As part of the trial Clean Seas is providing a tank to grow the seaweed in, while CH4 is outfitting it to grow asparagopsis.


Gratton said he was confident in the science of growing asparagopsis and that the three-year trial would focus how to grow the seaweed at scale.


"The science is clear, this species of asparagopsis grows in our waters and captures carbon and nitrogen; this is more a technical scale-up exercise," he added.


Gratton said if successful, asparagopsis production could become a mainstay of its business.


"If this was successful, I could see a future where all our leases up and down the Spencer Gulf have some form of algae production," he said.

- ABC News

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