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The effects of variable and fluctuating sublethal ammonia concentrations on plasma ammonia concentration, growth, feed conversion ratio and survival of juvenile hybrid striped bass Morone chrysops ♀xM. saxatilis ♂, channel catfish Ictalurus punctatus and blue tilapia Oreochromis aureus were evaluated in each of three sequential growth periods. Fish were cultured in a flow-through system in which pH...