Effect of using corn protein concentrate (Empyreal) in rainbow trout diet on growth performance and carcass amino acid composition
Subject Areas : New Technologies in Aquaculture Development
Keywords: growth, Rainbow trout, Fishmeal replacement, Keywords: Corn protein, Empyreal,
Abstract :
The present study was carried out to replace fishmeal up to 5% with concentrated corn protein (Empyreal®) in rainbow trout diet on some growth parameters and profile of fish carcass amino acids. In this study, 2000 fish (initial weight 300±5 g) were fet with basal diet containing fish meal (control) and experimental diet containing 5% Empyreal as a fishmeal substitute in 6 tanks with a density of 16 fish per cubic meter under similar conditions for 50 days. Biometric results showed that fish fed with Empyreal had the lowest feed conversion ratio (0.99±0.07), feed efficiency index (34.38±0.77) and survival (99±0.85). However, other growth and nutrition indices were not significant amoung treatments (P>0.05). Also, analysis of amino acids of the fish fillets showed no significant difference between treatments. As at 5% replacement level of fishmeal with Empyreal cannot significantly improve some growth indices such as final weight, specific growth coefficient, liver index, protein yield ratio and carcass amino acid composition, but other indices such as feed conversion ratio, feed efficiency and survival percentage were improved. Therefore, it is possible to replace fishmeal with Empyreal at the 5% level without adversely affecting the measured parameters. However, further researchs on the higher-level replacement of fishmeal with Empyreal sre suggested.
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