فهرست مطالب حسین پناهی صاحبی

The aim of this study was to investigate the physiological response of young beluga to different levels of sodium butyrate in the diet. For this purpose, 360 young beluga (average weight of 15 ± 0.56 g) with 6 experimental diets containing 0, 0.1, 0.2, 0.3, 0.4 and 0.5% sodium butyrate were fed for 8 weeks. The number of red blood cells (RBC) and MCV, MCH and MCHC indices were significantly higher in the 0.3% treatment than in the other treatments (p <0.05). The number of white blood cells (WBC) and the amount of hemoglobin and hematocrit in fish fed with 0.3% sodium butyrate in the feed were higher than other treatments, although there was no significant difference with the treatment of 0.4% and the control group (p >0.05). Lysozyme activity and IgM level in 0.3% treatment was significantly higher than other treatments (p <0.05). Cortisol and glucose levels in fish fed diets containing 0.3% sodium butyrate increased slightly less than other groups after acute density stress and a significant difference was observed between treatments (p <0.05). Overall, this study indicates that including 0.3% sodium butyrate in the diet of young beluga can improve fish health, innate immune response and resistance to density stress.

Probiotics and prebiotics are the most important bioactive compounds for aquatic health. In this study, the effects of prebiotic (immunowall) and probiotic (primalac) were assessed on growth performance, survival, body composition, and blood biochemical parameters in the Caspian Sea common carp Cyprinus carpio fingerlings. Juveniles (n = 100 per tank, 21 tanks) were distributed in four inclusion levels (each in three treatments) of 0, 0.05, 0.1 and 0.15% of immunowall and primalac inclusions for a period of 56 days. Growth, body composition, and hematological parameters have been evaluated in different inclusion levels at the end of culture period. The increment of body weight, specific growth rate, and feed conversion ratio in fish fed with diets containing 0.15% prebiotic and 0.1% probiotic improved considerably compared to other treatments. The survival rate of the juveniles was not significant between treatments, and the group fed with the pre- and probiotics revealed higher survivals. Protein content in the group fed with the pre- and probiotic showed significantly higher contents compared to the control group, and lipid content showed increasing trend in different inclusions. The red blood cells contents showed no differences between treatments; but the white blood cells contents revealed higher performances in the fish-fed probiotics compared to prebiotic and control groups. These results recommend the addition of 0.1 % immunowall and 0.15 % primalac in the diets of the juveniles in terms of growth, feeding, and hematological indicators in the Caspian carp.

This study was conducted to evaluate the influence of exogenous supplement Natuzime plus enzyme on growth performance, body composition and survival rate of beluga (Huso huso) juveniles. Juveniles (n = 17 fish per each tank with initial weight of 30 g) were randomly distributed in 150-L tanks and fed with four diets (each in three replicates) containing 0, 2, 5 and 10 % of Natuzime plus multi enzyme for eight weeks. Results showed that survival rate of the fish were in the range of 83-95 % and there were significant differences between treatments. The highest weight gain was recorded in fish fed with 2 % enzyme and being different from the other groups. The specific growth rate was to be ranged from 1.96 (10 % enzyme) to 2.32 (2 % enzyme). Feed conversion ratio, protein efficiency ratio and daily growth rate were significantly higher in the diets containing enzymes compared to the control group; and the best performance was attained in 2 % enzyme in the diet. The highest (69.5 %) body protein content was recorded in the fish fed with 2% enzyme in the diet. The results obtained suggest that dietary inclusion of 2% Natuzime plus enzyme can improve the growth performance and survival rate of beluga juveniles.

The purpose of this study was to determine the effect of substitution plant proteins of sesame meal with fish meal on growth performance, some body compostion and blood parameters in the Rutilus frisii kutum. to carry out the test, the number of 600 fishes weighing 1 to 3 grams with 40 densities located in 15 pools. Feeding done with rations containing different levels of sesame meal includes 4 treatments with 10,20,30 and 40 percent of  sesame meal substitution with fish meal and one control treatment (without sesame meal). results of evaluation of growth and body compostion showed that the highest weight gain and specific growth rate and the lowest feed conversion ratio were observed in control treatment which had a significant difference with other treatments (p<0.05). the highest amount of moisture, protein and low amount of fat were observed in control treatment, which had a significant difference with other treatments (p<0.05). the results of blood factors showed that the highest levels of red blood cells, white blood cells, hemoglobin, hematocrit and MCHC were observed in control treatment. Also, the highest total protein, albumin, globulin, triglyceride and cholesterol were observed in control treatmentwhich showed statistically significant difference with other treatments (p<0.05). this study showed that the inclusion of different levels of sesame meal instead of fish meal in Rutilus frisii kutum had a negative effect on growth parameters but had no negative effect on blood factors.