Let Them Eat Pelagibacter
We are running out of fish to eat, so apparently we will have to begin harvesting other oceanic biomass sources. I suggest going right to the source and figuring out how to turn Pelagibacter ubique into chewy burger patties. Should go well with some gorgonzola topping. Anyway, this awesomely efficient creature is the most abundant organism on the planet and probably constitutes more biomass than all the oceanic eukaryotes combined. Its impressively stripped-down genetic sequence means that a minimum of nitrogen is required to facilitate its growth, thus reducing the need for fertiliser inputs.