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DIETARY PROTEIN LEVEL AFFECTS COMPENSATORY GROWTH RESPONSE IN RAINBOW TROUT (ONCORHYNCHUS MYKISS) UNDER CYCLIC FEEDING

Mirela Crețu

Abstract

This study was conducted to determine the effects of various levels of dietary protein and short-term starvation periods on compensatory growth, body compositions and organ indices of rainbow trout (Oncorhynchus mykiss) during 46 days. Fish were fed ad libitum twice a day or starved as follows: two control groups, one group was feed daily with extruded pellets containing 41% crude protein (D41) and the other control group was feed daily with commercial pellets containing 50% crude protein (D50); two groups fasted for 2 days and then reefed with commercial pellets with 41% (D2/41), respectively 50% crude protein (D2/50) until either their relative feed intake differed by less than 10% from control groups; two groups fasted for 4 days and then reefed with commercial pellets with 41% (D4/41), respectively 50% crude protein (D4/50) until either their relative feed intake differed by less than 10% of control groups. At the end of the trial, the rainbow trout starved for two or four days has shown only partial compensation of growth. This was due to the fact that their weight and length differed significantly (p<0.05) from those from the control group (p<0.05). Regarding the body composition, it was observed an increase in water content, respectively a decrease of lipid content, fish body trying to limit the loss of body mass during starvation periods. However, it can be concluded that application of short periods of starvation (2 or 4 days) followed by refeeding with a diet containing 41% crude protein can generate lower production costs since we did not register significant differences (p>0.05) between the technological indicators.

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DOI resolver: doi.org/10.5593/sgem2019/6.1/s25.136

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