| Three experiments were conducted to investigate protein and energy utilization by Atlantic halibut (Hippoglossus hippoglossus ). A growth trial investigated the optimal dietary protein requirement for juvenile halibut. Fish with weight of 5.6 +/- 0.03g were fed diets containing 45 to 65% dietary protein. Regression analysis on growth parameters indicated that juvenile halibut require at least 64% dietary protein. The second trial evaluated the growth performance of juvenile halibut fed commercially available feeds. 1800 fish (25g) were fed diets from two different mills. Halibut grew 13% better (p>0.05) on diets produced in a local feed mill with 26.7g DP/MJ DE. Digestibility of fourteen practical feedstuffs was also determined. Protein digestibility was highest for casein, soy protein concentrate, krill hydrolysate, fish meal, and blood meal with digestibility coefficients of 99.9, 99.6, 98.1, 95.9, and 93.2% respectively. |
