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Original Research

Egypt. J. Exp. Biol. (Zoo.). 2010; 6(2): 231-238


INFLUENCE OF ENVIRONMENTAL FACTORS ON TESTES MATURATION AND THE ACTIVITY OF SOME PITUITARY-HORMONE SECRETING CELLS IN MALES OF PARAEUTROPIUS BUFFEI (SCHILBEIDAE)

Mousa A. Mostafa El-Gohary M. Nawal Khalil A. Noha.




Abstract

The present research has been designed to evaluate the effect of variation of the three environmental parameters; rain, water level and conductivity on testicular recrudescence and regression as well as the activity of pituitary-hormone secreting cells in the male of freshwater fish species, Paraeutropius buffei. It was found that the environmental factors are effective in inducing testes maturation and producing mature males of P. buffei. Most of the testes had lumen filled with spermatozoa, whereas, the growing testes of control fish exhibited resorption. Interestingly, the hypophysial activity was drastically activated during induction, reaching a peak at the time of reproductive maturity. Gonadotrops (GTH cells) are small in size and few in number in the pituitary gland of the control fishes. In contrast, these cells are hypertrophied and contain numerous immunoreactive granules after the environmental factors application. On the other hand, there is no significant change in the activity of both thyrotrops (TSH) and somatolactin (SL) cells in males during the experiment. These results demonstrated that testes maturation in the male of P. buffei can be triggered by the tested environmental factors. This suggests that environmental stimuli may act on hypothalamus in the brain, and consequently determines the activity of the pituitary gland via a positive feedback to induce hypophysial hormones synthesis. Also, these results stimulate the need for further study to identify which factor(s) act as a cue for gonad maturation in the different freshwater fishes.

Key words: Environmental factors, Paraeutropius buffei, Testis, Immunohistochemistry, Pituitary gland






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