effects of fish oil replacement with poultry by-product oil in diet of beluga sturgeon (huso huso) on growth performance and carcass composition

The potential of using poultry by-product oil as a partial replacement for fish oil in the diets of young beluga sturgeon (huso huso) (initial body weight, 270.6 ± 8.4 g) was studied. three experimental diets with different levels of fish and poultry by-product oil were formulated as: 100% fish oil (fo), 100% poultry by-product oil (po), and a blend of equal amounts of fish and poultry by-product oils (fpo). all diets were isoproteic (30% dm) and isolipidic (12% dm). after 8 weeks of feeding, the condition factor was significantly lower in the fish fed with fpo than in the fish oil group (p<0.05), whereas no significant differences were observed in body weight gain, feed conversion ratio, specific growth rate, protein productive value, protein efficiency ratio, crude protein, crude fat, ash, and moisture among treatments. furthermore, the liver and viscera fat of the fish fed with po were significantly higher than those of the other treatments (p<0.05). the results indicate that poultry by-product oil can effectively replace up to 50% of fish oil in the diet of young beluga sturgeon (as in the fpo treatment) without adversely affecting growth performance, body composition, or nutrient utilization.