0.05). Analysis of molecular variance showed high genetic diversity (%95) within populations. The Fst value was 0.046, indicating low genetic differentiation among Anzali and Gomishan regions. In this study, 10 of 20 (10 loci × 2 populations) tests showed significant deviation (P≤ 0.005) from Hardy-Weinberg equilibrium due to the heterozygosity deficiency. Results from UPGMA cluster analysis, based on Nei´s genetic distance, showed that the regions are probably separated from each other. ]]>
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0.05).However, lumen diameter of the distal tubule of nephron in the trunk kidney, increased significantly in 60 ppt treatment 48 hours from starting the experiment (P<0.05). The thickness of the epithelium tubule in both trunk and tail parts showed no significant differences during the adaptations (P>0.05). According to the results, histomorphological changes in the different parts of the kidney returned to the basic structure with in 24 to 48hours after exposure to different salinities.]]>
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0.05). At same protein level, PER, PR increased with the increase in energy levels from 20 to24 Kj g-1. Carcass moisture and ash contents were significantly affected by dietary protein and energy levels (P<0.05) but carcass protein was not significantly affected by dietary protein and dietary energy levels (P>0.05) .With increase dietary energy, carcass fat content was increased from 20 to 24 Kj g-1. The results indicate that the optimum dietary protein and energy levels for growth of juvenile yellowfin seabream are 56. 20 – 57 . 47g in Kg-1diet and 21.9-24.56Kj in gr diet and 23.15-25.95mgr kg-1 ,respectively]]>
p. 22−33
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p. 47−55
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0.05), but group treated with 4 g/kg MOS showed significant differences in food intake (P<0.05).The highest and the lowest growth performance were observed in 2 and 4 g/kg MOS treatments, respectively. There were no significant differences in survival rate among experimental groups (P>0.05). Fish treated with 2 g/kg MOS showed significant differences in fat content of muscle tissue (P<0.05), but no significance difference in protein, ash and moisture (P>0.05) were recorded. No significant difference was observed in intestinal lactic acid bacteria among the groups (P>0.05). The experiment indicated that the prebiotic mannan oligosaccharide didn’t influence the growth performance in beluga juvenile and it is not appropriate for supplementation in the diet of this cultured species.
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p. 78−87
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