Energetics of winter flounder (Pseudopleuronectes americanus) fed the polychaete, Nereis virens, under experimental conditions

Age class I and II winter flounder, Pseudopleuronectes americanus, were fed the polychaete, Nereis virens, under experimental temperatures of 100C and 200C in a filtered (10 μ), temperature-regulated seawater system for periods of 40 days. All the fish grew and there was no significant difference in growth between fish at 100C and those at 200C, but growth was significantly different (P less than 0.05) between age classes at both temperatures. Age I fish had the higher growth efficiency and mean gross growth efficiencies based on calories were 23.7 percent and 20.2 percent for age I and II, respectively. Calculated efficiencies were lowest based on wet weight and generally increased when based on dry weight, carbon, and caloric content