You would have to "power" the fish by feeding it. Disregarding the inefficiencies of bringing the energy to the individual in the form of food and the fact that the fish uses energy for many other things, you still cannot expect more energy from the fish than that coming from the food.
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You would have to "power" the fish by feeding it. Disregarding the inefficiencies of bringing the energy to the individual in the form of food and the fact that the fish uses energy for many other things, you still cannot expect more energy from the fish than that coming from the food.