Desirable Dietary Protein and Sugar Levels for A New Backcross Sea Bream, Red Sea Bream_??_×F1 (Red Sea Bream_??_×Crimson Sea Breamg _??_) _??_

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Dietary protein and sugar levels to obtain reasonable growth performance were assayed on a new backcross sea bream (RF1), red sea bream Pagrus major _??_×F1 (red sea bream_??_×crimson sea bream Evynnis japonica _??_) _??_. The fish, having an initial mean body weight of 32 g, in duplicate aquaria were respectively fed on six diets combining two levels of protein (P40% and P48%) against three levels of sugar (S23%, S27%, and S30%), under a daily energy intake of 6.7 kcal/100 g for 73 days. No significant differences among the dietary treatments were obtained in survival, final body weight, hematological character, relative hepatopancreas and intestinal organ weight to body weight, and carcass crude protein and ash contents. While significantly high relative gastral organ weight to body weight, carcass moisture and crude lipid contents, and hepatopancreatic crude lipid contents appeared in some dietary groups, there was not a fixed trend that was resulted in differences among the dietary treatments. High apparent protein and lipid retentions were respectively obtained in the groups fed P40%·S27% diet and P48%·S27% diets. These indicate that the RF1 can efficiently utilize a diet with lower P40% and higher S27%, as compared with red sea bream desiring a diet with P50% and S10%.
日本水産増殖学会の論文