The invention concerns a method of sustainably producing an aquaculture meat product by feeding a fish over its dietary cycles an aquaculture feed composition said method comprising the step of formulating an aquaculture feed composition by replacing all or part of fish oil in the composition with a single microbial source of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). In a preferred embodiment the microbial source comprising DHA and EPA derives from a microorganism/microbe of the genus or .
