Enhancement of Reproduction in Oreochromis niloticus by Induction of Inhibin and Activitin-Like proteins | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 40, Volume 28, Issue 4, July and August 2024, Page 657-675 PDF (1.81 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejabf.2024.369360 | ||||
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| Author | ||||
| Mostafa A. Mousa et al. | ||||
| Abstract | ||||
| The aim of the present research was to improve Oreochromis niloticus reproduction by treating females exogenously with L-thyroxin (T4), which will stimulate the producing of inhibin and activin A during the growth of larvae, with an influence on the growth and survival of larvae. The immunohistochemical examination was carried out on developing larvae from O. niloticus spawners administered T4 and control, examining the allocation of activin/inhibin subunits A and B, as well as the inhibin subunit α, from 1-28 days post-hatching. The injection of the females with T4 hormone had a notable impact on the reproductive activity, leading to an enhancement in the quality of their eggs, as demonstrated by the significantly normal larvae upon hatching. Findings from the immunohistochemical investigation showed that only inhibin/activin bA were obtained in the differentiate kidney, heart, brain, digestive system, and gills. Strong immunoreactivities of inhibin/activin bA were located in all examined tissues and ages, indicating that injections of thyroxin (1 or 5μg T4/g BW) into O. niloticus female significantly improved the yield of them in the growing tissues of larvae. Inhibin/activin bA could control the differentiation and growth of various organs in O. niloticus larvae. Consequently, T4, inhibin, and activin A through direct or indirect means aided in the growth of O. niloticus larvae, as evidenced by the notable increases in larvae weight and length that obtained through the entire experiment. In addition, in comparison to the control, the treated females' larvae had a noticeably greater rate of survival. We could conclude that tilapia females' reproduction is enhanced by external T4 in the blood of females, which then transfers through the eggs to larvae. The thyroid hormone that was transferred seems to influence the production of inhibin/activin A, which could provide a unique growth advantage for the progeny of O. niloticus. | ||||
| Keywords | ||||
| Fish larvae; Oreochromis niloticus; Thyroxin; Development; Growth; Inhibin/activin A | ||||
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