Abstract
Five groups of raibow trout (mean initial weight 0.84 g and standard length 3.75 cm) were reared in raceways, under commercial conditions at different densities (31, 94, 156, 250 and 312 Specimens/m 3) for 365 days. The aim of the experiment was to investigate the most suitable, effective and economical rearing density during a full rearing period under conditions widely found in Greece. Differences in food consumption, mean body weights and metabolic and physiological responses of the groups were noted throughout the experimental period. The lowest growth rate appeared in fish at the highest density; the differences observed between most of the other densities were not significant. It is concluded that although higher densities depressed the growth rate, the proper choice of density depends on the required final live body weight.
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