Effects of AquaVac Ergosan on growth performance, survival And haematological factors in beluga (Huso huso) juvenile

A 60-day feeding trial was conducted to examine the effect of dietary Ergosan on growth performance, survival and blood cells changes in beluga, Huso huso juvenile. Ergosan as algal product containing 1% alginic acid supplemented at 0, 2, 4 and 6 g/kg diet (diets A, B, C and D, respectively). Each diet was fed to triplicate groups of Beluga with the initial body weight of 41.7±1.8 g at 10 days intervals (1-10th, 20-30th and 40-50th with non-supplemented diets and 10-20th, 30-40th and 50-60th with supplemented diets). Control group fed with non-supplemented diet during the experiment. Fish fed with respective diets based on 5% body weight. Water temperature was 24.3±2.3 °C. Photoperiod was adjusted at 13 Light /11 dark. Growth indices in the fish fed with supplemented diets were significantly higher than the control group (P<0.05). Feed conversion ratio (FCR) in the fish fed diets B, C and D were significantly better than the control group (P<0.05), while PER was not different among groups. Survival was not different among all the treatments (P>0.05). Also, use of Ergosan resulted in significance differences in lymphocyte percentage, while there were no statistically significant differences in hematocrit, monocyte and myelocyte percentages, hemoglobin concentration, number of erythrocytes, total leukocytes, mean corpuscular volume, mean corpuscular hemoglobin and mean corpuscular hemoglobin concentration. Neutrophils and eosinophils percentage in the control group was higher than the fish fed with supplemented diet (P<0.05). These results indicated that dietary Ergosan affect some growth and haematological parameters in great sturgeon, Huso huso juvenile.