Determination of apparent digestibility of the common ingredients used in the feed of juvenile Huso huso

Apparent digestibility of dry matter, crude protein, crude lipid and gross energy for fish meal (kilka fish meal, mixture fish meal, batch fish meal and south fish meal), some of the animal sources (poultry by product, meat and bone meal, blood meal cow), plant sources with high protein (wheat gluten and corn gluten) and plant sources with low protein (wheat meal, corn meal, canola meal, prepared soybean meal and soy bean meal) in juvenile Huso huso (160.42 ± 23.35 g) were investigated. Experimental diets were formulated based on 70% of the content of the reference diet and adding 30% of the ingridient test. One percent of chromium oxide was added as an indirect marker to all diets. Fish were reared in fiberglass tanks (500 L- 1) for 8 weeks and fed satiation two times daily. Collction of settlement faecal were carrird out half or one hour after feeding via siphon deposited on the tank floor. Reslts indicated that Kilka fish meal had the highest protein digestibility (94%), but significant differences in the digestibility of batch, South and Combined fish meal (93 to 89%) with wheat gluten and corn (94 to 89%), prepared soybean meal and soybean meal (87% to 82%) and poultry by product (81%) were not found (P>0.05). The highest lipid digestibility was found in batch fish meal (92%), followed by kilka fish meal (91%), south fish meal (90%), combined fish meal (89%) and poultry by product (83%) (P <0.05). Current study showed that prepared plant sources have digestibility such as fish meal, although poultry by product and soy bean meal can be considered as a possible alternative to fish meal for the formulation of commercial diet in Huso huso juvenile.