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Articles by Ghaffar Ebrahimi
Total Records ( 2 ) for Ghaffar Ebrahimi
  Ghaffar Ebrahimi
  This study was conducted to assess the effects of various background colors of the culture vessels on growth performance and stress response in juvenile common carp (C. carpio). During the 8 weeks experimental period, juvenile common carp (n = 150) were reared in five tanks with different background colors (white, black, red, blue and yellow). Three replicates of fish were hand-fed near satiety twice a day. Background color did not significantly affect the growth performance of juvenile common carp (p>0.05). Rearing juvenile common carp in black and red tanks led to lower final body weights, specific growth rate and weight gain compared to other tanks (white, yellow and blue). The survival rate ranged from 96.6±3.33 to 100% and was not affected (p>0.05) by tank background colors. The juvenile C. carpio presented higher specific growth rate in the tanks with blue backgrounds (2.89±0.04% day-1) than in other treatments. The lowest means of protein efficiency ratio (2.03±0.02) and feed efficiency ratio (0.67±0.01) were related to the juveniles held in the red-background tanks. Plasma cortisol concentrations showed significant differences among the fish reared on differently colored backgrounds (p<0.05). The highest means of cortisol concentrations were registered in the juvenile C. carpio held in the tanks with red backgrounds. Rearing C. carpio juveniles in tanks with bright colors can improve optimum culture conditions for juvenile common carp. The elevated cortisol levels in the fish signify that tanks with black and red backgrounds bring about chronic stress in the contained fish and thereby, cannot provide optimum culture conditions for juvenile common carp.
  Ghaffar Ebrahimi
  A feeding trial was conducted to evaluate the effects of a commercial prebiotic, immunogen on growth performance and survival of the kutum Rutilus frisii kutum fingerlings. The fingerlings were adopted for 2 weeks and then reared as triplicate groups in 250-l tanks (n = 50 per tank with average initial weights of 499.1±5 mg). Four incremental levels (0.5, 1.0, 1.5 and 2.5 g kg-1 prebiotic diet) of a commercial prebiotic, immunogen (Provided by Soroush radian Co., Tehran, Iran) were added to the basal diet A (control) to prepare diets B, C, D and E as the treatments. The fish fed on the experimental diets ad libitum thrice a day for 8 weeks. Weight gain and specific growth rates showed significantly differences among the groups fed different immunogen levels. Feed conversion ratio showed a decrease with increasing immunogen level in diet. Both feed and protein efficiency ratios enhanced significantly with the highest prebiotic level of 2.5 g kg-1 diet (p<0.05). Feed Intake (FI) and Protein Intake (PI) didn’t significantly affect by the prebiotic immunogen level (p>0.05). The lowest mean of total bacterial counts was observed in the fish fed a dietary immunogen level of 2.5 g kg-1 diet (p<0.05). The present study shows that a dietary immunogen supplementation of 1.5 g kg-1 is capable to improve the feed efficacy and growth performance of R. frisii kutum fingerlings.
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