Protein levels in aquaculture feeds generally average
18-20% for marine shrimp, 28-32% for catfish, 32-38% for
tilapia, 38-42% for hybrid striped bass. Protein requirements
usually are lower for herbivorous fish (plant eating)
and omnivorous fish (plant-animal eaters) than they are for
carnivorous (flesh-eating) fish, and are higher for fish
reared in high density (recirculating aquaculture) than low
density (pond aquaculture) systems.