Effect of the combination of a cold-water temperature and exogenous estrogens on feminization, growth, gonadosomatic index and fat muscle content of Nile tilapia Oreochromis niloticus (Linnaeus, 1758)

ABSTRACT The use of water temperature to modify sex proportion in Nile tilapia has been suggested as an alternative to eliminating the use of steroids since it was discovered that it has an important role in the sex differentiation process. However, the use of cold-water temperatures to achieve femi...

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Autores principales:	Lazaro-Velasco,Angel, Isidro-Cristobal,Helsi M., Alcántar-Vázquez,Juan Pablo, Antonio-Estrada,Carolina, Calzada-Ruiz,Daniel, Torre,Raúl Moreno-de La
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2019
Materias:	Oreochromis niloticus feminization thermosensitivity growth depression gonads fat in muscle
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2019000100052
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spelling	oai:scielo:S0718-560X20190001000522019-03-27Effect of the combination of a cold-water temperature and exogenous estrogens on feminization, growth, gonadosomatic index and fat muscle content of Nile tilapia Oreochromis niloticus (Linnaeus, 1758)Lazaro-Velasco,AngelIsidro-Cristobal,Helsi M.Alcántar-Vázquez,Juan PabloAntonio-Estrada,CarolinaCalzada-Ruiz,DanielTorre,Raúl Moreno-de La Oreochromis niloticus feminization thermosensitivity growth depression gonads fat in muscle ABSTRACT The use of water temperature to modify sex proportion in Nile tilapia has been suggested as an alternative to eliminating the use of steroids since it was discovered that it has an important role in the sex differentiation process. However, the use of cold-water temperatures to achieve feminization has rarely been explored and never has it been combined with exogenous estrogens. This work aimed to determine if the proportion of females could be increased by combining low concentrations of estrogens with a cold-water temperature, and describing its effect on growth parameters, gonadosomatic index, and fat muscle content. Two experiments were carried out, each one set at a specific water temperature (27.5 and 21.5°C). In each experiment four treatments (per triplicate) were evaluated (control -no estrogens-, estradiol-17β E2, 17α-ethinylestradiol EE2 and diethylstilbestrol DES). Higher feminization rates were observed in all groups, including the control group, reared at 21.5°C. Growth parameters showed significantly higher values (P < 0.05) for the groups reared at 27.5°C. The control group and the group fed E2 reared at 21.5°C showed significantly higher (P < 0.05) values of gonadosomatic index than that observed in the groups reared at 27.5°C. Fat muscle content was significantly higher (P < 0.05) in both experiments for the groups fed E2 and EE2. The fry used showed a high tendency towards feminization by exposure to a cold-water temperature. Our results allow us to consider E2 (21.5°C) the best option for the development of YY technology.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.47 n.1 20192019-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2019000100052en10.3856/vol47-issue1-fulltext-7
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Oreochromis niloticus feminization thermosensitivity growth depression gonads fat in muscle
spellingShingle	Oreochromis niloticus feminization thermosensitivity growth depression gonads fat in muscle Lazaro-Velasco,Angel Isidro-Cristobal,Helsi M. Alcántar-Vázquez,Juan Pablo Antonio-Estrada,Carolina Calzada-Ruiz,Daniel Torre,Raúl Moreno-de La Effect of the combination of a cold-water temperature and exogenous estrogens on feminization, growth, gonadosomatic index and fat muscle content of Nile tilapia Oreochromis niloticus (Linnaeus, 1758)
description	ABSTRACT The use of water temperature to modify sex proportion in Nile tilapia has been suggested as an alternative to eliminating the use of steroids since it was discovered that it has an important role in the sex differentiation process. However, the use of cold-water temperatures to achieve feminization has rarely been explored and never has it been combined with exogenous estrogens. This work aimed to determine if the proportion of females could be increased by combining low concentrations of estrogens with a cold-water temperature, and describing its effect on growth parameters, gonadosomatic index, and fat muscle content. Two experiments were carried out, each one set at a specific water temperature (27.5 and 21.5°C). In each experiment four treatments (per triplicate) were evaluated (control -no estrogens-, estradiol-17β E2, 17α-ethinylestradiol EE2 and diethylstilbestrol DES). Higher feminization rates were observed in all groups, including the control group, reared at 21.5°C. Growth parameters showed significantly higher values (P < 0.05) for the groups reared at 27.5°C. The control group and the group fed E2 reared at 21.5°C showed significantly higher (P < 0.05) values of gonadosomatic index than that observed in the groups reared at 27.5°C. Fat muscle content was significantly higher (P < 0.05) in both experiments for the groups fed E2 and EE2. The fry used showed a high tendency towards feminization by exposure to a cold-water temperature. Our results allow us to consider E2 (21.5°C) the best option for the development of YY technology.
author	Lazaro-Velasco,Angel Isidro-Cristobal,Helsi M. Alcántar-Vázquez,Juan Pablo Antonio-Estrada,Carolina Calzada-Ruiz,Daniel Torre,Raúl Moreno-de La
author_facet	Lazaro-Velasco,Angel Isidro-Cristobal,Helsi M. Alcántar-Vázquez,Juan Pablo Antonio-Estrada,Carolina Calzada-Ruiz,Daniel Torre,Raúl Moreno-de La
author_sort	Lazaro-Velasco,Angel
title	Effect of the combination of a cold-water temperature and exogenous estrogens on feminization, growth, gonadosomatic index and fat muscle content of Nile tilapia Oreochromis niloticus (Linnaeus, 1758)
title_short	Effect of the combination of a cold-water temperature and exogenous estrogens on feminization, growth, gonadosomatic index and fat muscle content of Nile tilapia Oreochromis niloticus (Linnaeus, 1758)
title_full	Effect of the combination of a cold-water temperature and exogenous estrogens on feminization, growth, gonadosomatic index and fat muscle content of Nile tilapia Oreochromis niloticus (Linnaeus, 1758)
title_fullStr	Effect of the combination of a cold-water temperature and exogenous estrogens on feminization, growth, gonadosomatic index and fat muscle content of Nile tilapia Oreochromis niloticus (Linnaeus, 1758)
title_full_unstemmed	Effect of the combination of a cold-water temperature and exogenous estrogens on feminization, growth, gonadosomatic index and fat muscle content of Nile tilapia Oreochromis niloticus (Linnaeus, 1758)
title_sort	effect of the combination of a cold-water temperature and exogenous estrogens on feminization, growth, gonadosomatic index and fat muscle content of nile tilapia oreochromis niloticus (linnaeus, 1758)
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2019
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2019000100052
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Effect of the combination of a cold-water temperature and exogenous estrogens on feminization, growth, gonadosomatic index and fat muscle content of Nile tilapia Oreochromis niloticus (Linnaeus, 1758)

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