양어사료의 어분대체원으로서 수산가공부산물의 이용 1. 고등어 가공부산물의 효소적 가수분해물의 성장효과

Availability of marine by-product substituted for fish meal 1. Growth effects of mackerel by-product hydrolysates in Korean rockfish feeds

The effects of different dietary enzymatic hydrolysates using mackerel by-product on growth and chemical compositions of korean rockfish were studied. Fishes were fed four experimental diets containing 60% white fish meal, 45% white fish meal and 15% mackerel hydrolysate whole, 45% white fish meal and 15% mackerel hydrolysate 500(molecular weight cutoff), and 45% white fish meal and 15% mackerel hydrolysate 5,000(molecular weight cutoff), respectively. In korean rockfish, effects on the weight gain and feed efficiency in enzymatic hydrolysates using mackerel by-products addition group were very effective. Weight gain ratios of enzymatic hydrolysates addition group were increased at 419.6~446.7%, compared with 385.2% at control group after eight weeks growth trial. Crude protein and crude lipid contents in the dorsal muscle of fishes fed diets supplemented with enzymatic hydrolysates were higher than fishes fed diet without enzymatic hydrolysates, while the moisture and crude ash contents in the dorsal muscle did not show any remarkable differences among diet groups with enzymatic hydrolysates or without. In korean rockfish, total amino acids of enzymatic hydrolysates addition group were 3,507.6~3,571.0㎎%, compared with 3,379.7㎎% at control group after eight weeks growth trial. Fatty acid compositions of dorsal muscle were not affected by the different dietary ; high levels of 14:0 from saturated, 14:1 from monoenoic, 18:2n-6 and 20:2n-6 from polyenoic.