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The present study was carried out to investigate the effects of parasites, monogenea, Dactylogyrus spp. and Gyrodactylus spp. on some enzymatic and biochemical components of liver in healthy and infected common carp, Cyprinus carpio. For this purpose, 10 healthy and 10 infected fish were collected from farm. The blood samples were taken and after separation of serum, the values of Aspartate aminotransferase (AST), Alanine aminotransferase (ALT) enzymes activities as well as Creatinine and Urea were measured. Based on obtained results, the values of AST, ALT enzymes activities as well as Creatinine and Urea were higher in the infected fish compared to noninfected fish. In conclusion; our results reveals that infection with external parasites, Dactylogyrus spp. and Gyrodactylus spp. can causes some dysfunctions in liver and kidney of common carp.

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This study aimed to compare the efficacy of dietary a-tocopherol with that of DL-a-tocopheryl acetate, both either alone or in combination with vitamin C (ascorbic acid), on the growth performance, survival, and stress resistance of angelfish, Pterophylum scalare, juveniles. Juveniles were fed ad libitum for four weeks with Artemia enriched with no vitamins (control), vitamin C (T c ), a-tocopherol (T a ), DL-a-tocopheryl acetate (T DL ), a-tocopherol and vitamin C (T a+C ), and DL-a-tocopheryl acetate and vitamin C (T DL+C ). After four weeks, an osmotic stress test was performed using seawater (25 g/L) to evaluate juvenile's resistance to stress. Whole-body glucose and cortisol were used as stress indicators. At the end of the feeding trial, growth performance and survival of the juveniles fed vitamin-enriched Artemia were significantly (P \ 0.05) higher than for the control fish. Best performance was recorded for the T a+C group. Survival, however, was not significantly (P [ 0.05) different between the vitamin-fed groups. Osmotic stress significantly elevated the stress indicators, whole-body cortisol and glucose levels (P \ 0.05), highest and lowest values being observed in control and T a+C groups, respectively. Survival after osmotic stress of juveniles fed the T a+c diet was significantly higher (by 46.2%, P \ 0.001) than for controls. Results suggested that a-tocopherol has greater efficacy than DL-a-tocopheryl acetate and enriching Artemia with a-tocopherol and vitamin C together improves growth performance, survival, and stress resistance of angelfish juveniles.

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