Energetics of Winter Flounder (Pseudopleuronectes americanus) Fed the Polychaete, Nereis virens, under Experimental Conditions

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Abstract
Age class I and II winter flounder P. americanus were fed the polychaete N. virens under experimental temperatures of 10 and 20.degree. C in a filtered (10 .mu.), temperature-regulated seawater system for periods of 40 days. All the fish grew and there was no significant difference in growth between fish at 10.degree. C and those at 20.degree. C, but growth was significantly different (P < 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 and 20.2% for age I and II, respectively. Calculated efficiencies were lowest based on wet weight and generally increased when based on dry weight, C and caloric content.

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