Self-selection of diets with different amino acid profiles by rainbow trout (Oncorhynchus mykiss)
2000
Abstract The ability of rainbow trout to self-select a suitable feed among semi-purified diets with (1) a high protein (crude protein; CP=40%) and a balanced amino acid profile (casein:gelatin=6:1, BAL), (2) a high protein and an imbalanced amino acid profile (1:6, IMB), (3) a low protein (CP=15%) and a balanced amino acid profile (LP), and (4) a protein-free diet (PF), were examined using self-feeders. In experiment 1, combinations of two diets (BAL and IMB; BAL and PF; IMB and PF) were used. For each combination, four individually housed trout were provided with the diets. After an initial 2-week period, the positions of the two feed containers were exchanged and feeding continued for 3 more weeks. In the first 2 weeks, trout predominantly selected the BAL diet to the IMB or PF diet, although some fish failed to switch when the feeders were exchanged to obtain the BAL diet during the latter 3 weeks. In experiment 2, two combinations of four diets, BAL, two IMB and PF, or LP, IMB and two PF, were each offered to five individual trout for 3 weeks. Trout then showed preference for the BAL diet to the IMB and PF diets, and the LP diet to the IMB and PF diets. The preference for the BAL or LP diet gradually increased as the feeding trial progressed. These results suggest that trout preferred a casein-rich balanced amino acid diet regardless of its dietary protein level to a gelatin-rich imbalanced diet or a protein-free diet.
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