Abstract
Effects of feed deprivation (FR=0.0), underfeeding (FR=0.3% feed/day), moderately restricted feeding (FR=1.0) and adequate feeding (FR=2.0) on nutrient partitioning in 10-month-old rainbow trout ( Oncorhynchus mykiss) were studied in a 6-week growth trial at a water temperature of 15°C. Each treatment was administered to triplicate groups of individually tagged rainbow trout initially weighing 0.32 kg. Average body weight gains and feed efficiencies were significantly ( P<0.05) affected by the different feeding rates. Increased feeding rates had little influence on body composition except percent carcass fat and visceral protein. Percent fat in liver, red muscle and white muscle increased significantly with increasing feeding rates. Plasma protein, insulin, glucagon, and glucagonlike peptides also increased significantly, while growth hormone decreased, but not significantly, with increasing feeding rates.
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