Open AccessGrowth performance, muscle and liver composition, blood traits, digestibility and gut bacteria of beluga ( Huso huso ) juvenile fed different levels of soybean meal and lactic acid
Author(s) -
Matani Bour H.A.,
Esmaeili N.,
Abedian Kenari A.
Publication year - 2018
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/anu.12673
Subject(s) - huso , beluga , biology , fish meal , soybean meal , polyunsaturated fatty acid , sturgeon , food science , dry matter , lactic acid , fatty acid , meal , juvenile , zoology , biochemistry , bacteria , fishery , fish <actinopterygii> , ecology , raw material , genetics
The objective of this study was to assess the effects of fishmeal ( FM ) replacement with 0, 350 or 700 g/kg soybean meal (SBM) in combination with the supplementation of lactic acid ( LA ; 0, 10 or 20 g/kg) in the diets of juvenile beluga sturgeon ( Huso huso ; 700 ± 30 g). Nine isonitrogenous (400 g/kg protein) and isoenergetic (18 MJ /kg) diets were fed to beluga ad libitum, three times a day, for 60 days. The results showed that replacing FM with SBM without LA significantly reduced fish growth; on the other hand, LA supplementation had positive effects on fish fed diets that FM was replaced by SBM ( p < .05). Increasing SBM in the diet altered the fatty acid profiles of the fish, reducing long‐chain polyunsaturated fatty acids and the n‐3/n‐6 fatty acids. High amounts of SBM (700 g/kg) caused reductions in the haematocrit, glucose and cholesterol levels in the blood ( p < .05). In addition, the digestibility of protein, fat, dry matter and phosphorus was reduced when replacing FM with SBM , however, adding LA to the diets increased fish performance ( p < .05), and this improvement was sharper in 2% LA groups. The number of LA bacteria increased significantly with the dietary supplementation of LA ( p < .05). Based on these results, replacing 350 g/kg of FM with SBM and adding 20 g/kg LA to their feed do not negatively affect the biological and physiological indices of beluga.