The art of antimethanogenics has been hot in the world of algae. With teams like Greener Grazing and Seaforest hoping to take significant market share using Asparagopsis, let’s see how other seaweed extracts fare?

In this article we’ll review a neat article by Choi et al. who investigate brown seaweed extracts on in vitro rumen fermentation characteristics and methane production.


Methane (CH4) is the second largest contributor to greenhouse gas (GHG) emissions and seaweed might be a solution. Many have noted that adding seaweed to the diet of cattle reduces CH4 production via antimethanogenics. That’s because seaweed bioactive compounds like halogenated and polyphenolic metabolites help suppress methane generation.

The exact mechanism of this remains under question, so our guys Choi et al. consider the effects produced by three brown seaweed species (Undaria pinnatifida, UPIN; Sargassum fusiforme, SFUS; and Sargassum fulvellum, SFUL) on in vitro rumen fermentation and methane production.

credit Getty

Results of antimethanogenics paper

Brilliantly, they note that all three seaweed extracts decreased CH4 yield and its proportion to total gas production after 12, 24, and 48 h of incubation. They also saw changes in microbial populations depending on the seaweed species.

It’s great to see continued work in this area by the academic environment. In places like Australia, this application for seaweed aquaculture is most promising, but they focus most on the Asparagopsis species, so this investigation of different species offers helpful comparisons.


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