High temperature-induced sterility in the female Nile tilapia, Oreochromis niloticus

General and Comparative Endocrinology
Narayan Prasad PanditMasaru Nakamura

Abstract

High temperature treatments induce germ cell loss in gonads of vertebrate animals, including fish. It could be a reliable source for induction of sterility if the treatments led to a permanent loss of germ cells. Here we report that heat treatment at 37 °C for 45-60 days caused a complete loss of germ cells in female Nile tilapia, Oreochromis niloticus, and that sterility was achieved in fish at all stages of their life cycle. Unlike previous observations, germ cells did not repopulate even after returning them to the water at control conditions suggesting permanent depletion of germ cells. Gonadal somatic cells immunopositive for 3β-hydroxysteroid dehydrogenase (3β-HSD) were clustered at one end of the germ cell depleted gonads close to the blood vessel. Serum level of testosterone, 11-ketotestosterone, and 17β-estradiol was significantly decreased in sterile fish compared to control. Body weight of sterile fish was higher than control fish at the end of experiment. Our observations of increased growth and permanent sterilization in the high temperature-treated fish suggest that this method could be an appropriate and eco-friendly tool for inducing sterility in fish with a higher thermal tolerance.

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Citations

Dec 3, 2016·Sexual Development : Genetics, Molecular Biology, Evolution, Endocrinology, Embryology, and Pathology of Sex Determination and Differentiation·Jean-François Baroiller, Helena D'Cotta
Sep 9, 2019·Reproduction in Domestic Animals = Zuchthygiene·Sullip Kumar MajhiKuldeep Kumar Lal
Oct 5, 2017·Scientific Reports·Lene KleppeAnna Wargelius
May 1, 2018·Fish Physiology and Biochemistry·Diógenes Henrique de Siqueira-SilvaGeorge Shigueki Yasui
Jul 28, 2019·General and Comparative Endocrinology·Ye Hwa JinHerve Migaud

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