Ontology type: schema:ScholarlyArticle
2021-10-16
AUTHORSPrashanth Konkal, C. B. Ganesh
ABSTRACTThe aim of this investigation was to examine the influence of temperature on testicular activity in the continuously breeding fish Oreochromis mossambicus. The fish were subjected to natural temperature (controls; 21.95 ± 0.21 °C), and low water temperature (LT; 18.18 ± 0.17 °C) or high water temperature (HT; 34.66 ± 0.31 °C) for an experimental period of 21 days, following which they were euthanized and the testes examined. The mean number of spermatogonia was significantly higher in fish exposed to the HT treatment than in the controls and fish exposed to the LT treatment. However, a significant reduction in the mean number of primary spermatocytes, secondary spermatocytes, early spermatids and late spermatids was observed in fish subjected to the LT and HT treatments compared to the controls. In addition, the mean serum testosterone levels were significantly decreased in fish exposed to the LT and HT, whereas the serum cortisol levels were significantly higher in these fish groups compared with the control fish. Taken together, these results suggest that exposure of fish to LT or HT activates the neuroendocrine axis that regulates the stress respone, leading to the inhibition of the process of spermatogenesis, possibly through the suppression of testicular steroidogenesis in O. mossambicus. More... »
PAGES837-844
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