Abstract
European eels, with mean initial body weight of 40 g and maintained at 25°C, were fed on diets of different protein content (35, 40, 45, 50 and 55% protein), for 60 days. Two fish-protein sources, white fish meal (WFM) and herring meal (HM), were separately tested at the stated protein levels. WFM was a better protein source than HM, for all the protein levels assayed, as observed by feed conversion, protein efficiency for growth and apparent digestibility. For both protein sources the optimal daily protein intake for maximum growth was about 1.4 g 100 g fish.
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