Zooplankton on phytoplankton and methane oxidizers (MOB) diet synthetize omega-3 long-chain polyunsaturated fatty acids (LC-PUFAs) vital for human health and nutrition. Oily marine fish is the major dietary source of LC-PUFAs.
Globally, over half of the consumed fish is from aquaculture. Fish don't synthetize LC-PUFAs, thus feed having LC-PUFAs is in high demand. Currently aquaculture consumes 20% of the marine catch.
In batch experiments grown algae and MOB biomass was suitable for Daphnia water flea and the LC-PUFAS were transferred to them. Pilot scale growing of algae and MOB in circulating system was not stable. Thus, MOB and algae were grown separately and mixed to feed for Daphnia. In feeding experiment all fish survived but growth was smaller than with standard feed. Fatty acid and stable isotopes analyses are not done, thus efficiency of LC-PUFAs transfer to fish is not known. Also methane used in the end product is not yet known.