Histopathological alterations in kidney of Epinephelus coioides affected by Benzo[a]payrn (BaP) and Vibrio alginolyticus
Subject Areas : Histologymahin sadeghi 1 , negin salamat 2
1 - Shahid Chamran University of Ahvaz
2 - Khoramshahr Marine Science and Technology University
Keywords: kidney, Epinephelus coioides, Histopathology, Vibrio alginolyticus, Benzo(a)pyrene,
Abstract :
Benzo[a]pyrene (BaP) is the most toxic compounds in Petroleum that by contaminating the aquatic ecosystems, weakens the immune system of aquatic animals and ultimately reduces their resistance to opportunistic pathogens. Vibrio alginolyticus is a species of these opportunistic pathogens, Which, in stressful conditions, causes the disease of vibriosis in different organisms. In order to investigate the histopathological changes caused by two stressors including V. alginolyticus and BaP on kidney of Epinephelus coioides, 140 fish were divided randomly in 7 groups for 16 days. The control treatment received no injection and control vehicle received only coconut oil. Also, One group injected with 107 cfu/ml of V. alginolyticus. Groups 4 and 5, respectively received 20 and 200 mg/kg BaP and treatments 6 and 7, respectively injected with (20mg/kg BaP+107 cfu/ml V. alginolyticus) and (200mg/kg BaP+107 cfu/ml V. alginolyticus). All fish were sampled on days 1,4,7 and 14. The tissue sections were prepared, then, were examined under a light microscope. The most histopathological alterations observed in different groups were included formation of melanomacrophage centers, leukocyte infiltration, the separation of the basement membrane from the renal tubular epithelium, destruction of blood cells, glomerular capillary dilation and hemorrhage. The results showed that by increasing the concentration of Benzo[a]pyrene, the amount and severity of lesions increased. The most of the lesions were observed on combined treatment, especially fish treated with 200 mg/kg BaP+107 cfu/ml V. alginolyticus at day 7,so that tissue alterations such as tissue degeneration, necrosis, melanomacrophage centers and hemorrhage were observed in this treatments.
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