Environmental manipulation on Astyanax altiparanae out-of-season spawning

ABSTRACT This study aimed to evaluate the effect of manipulating hours of light and water temperature in some important reproductive parameters for Astyanax altiparanae fish farming during winter. The experiment was conducted from July 3rd to August 28th 2013 (57 days), and two groups of 32 couples...

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Autores principales:	Machado-Evangelista,Mariana, Sussel,Fábio Rosa, Romagosa,Elizabeth
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2019
Materias:	economic analysis egg production environmental manipulation lambari-do-rabo-amarelo larvae
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2019000200292
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spelling	oai:scielo:S0718-560X20190002002922019-06-04Environmental manipulation on Astyanax altiparanae out-of-season spawningMachado-Evangelista,MarianaSussel,Fábio RosaRomagosa,Elizabeth economic analysis egg production environmental manipulation lambari-do-rabo-amarelo larvae ABSTRACT This study aimed to evaluate the effect of manipulating hours of light and water temperature in some important reproductive parameters for Astyanax altiparanae fish farming during winter. The experiment was conducted from July 3rd to August 28th 2013 (57 days), and two groups of 32 couples of fish (G1 and G2) were used. On G1, hours of light and water temperature were not controlled; on G2, otherwise, these variables were manipulated in order to achieve similar conditions to those observed in spring. Every 14 days, eight couples of each group were hormonally induced with carp pituitary gland extract, and eggs were collected after semi-natural spawning. The percentage of females from G2 that spawned was higher than G1 (81.25 vs. 9.38%), the same trend was observed for a number of eggs produced per female (G1: 2,976.57 ± 1,085.71; G2: 8,471.14 ± 860.08). The G2 ovaries presented a higher incidence of primary growth oocytes and post-ovulatory follicles whereas G1 ovaries had more atretic follicles. Economic analysis showed that operational profit from eggs and larvae production on G2 was higher than on G1, as well as the gross margin. In conclusion, the results showed that environmental manipulation might improve reproduction management practices extending eggs and larvae production during the natural non-breeding season. Further studies are necessary to determine more appropriate facilities to be used by farmers in large scale, as well as management protocols to ensure the survival of post-larvae.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.2 20192019-05-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2019000200292en10.3856/vol47-issue2-fulltext-9
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	economic analysis egg production environmental manipulation lambari-do-rabo-amarelo larvae
spellingShingle	economic analysis egg production environmental manipulation lambari-do-rabo-amarelo larvae Machado-Evangelista,Mariana Sussel,Fábio Rosa Romagosa,Elizabeth Environmental manipulation on Astyanax altiparanae out-of-season spawning
description	ABSTRACT This study aimed to evaluate the effect of manipulating hours of light and water temperature in some important reproductive parameters for Astyanax altiparanae fish farming during winter. The experiment was conducted from July 3rd to August 28th 2013 (57 days), and two groups of 32 couples of fish (G1 and G2) were used. On G1, hours of light and water temperature were not controlled; on G2, otherwise, these variables were manipulated in order to achieve similar conditions to those observed in spring. Every 14 days, eight couples of each group were hormonally induced with carp pituitary gland extract, and eggs were collected after semi-natural spawning. The percentage of females from G2 that spawned was higher than G1 (81.25 vs. 9.38%), the same trend was observed for a number of eggs produced per female (G1: 2,976.57 ± 1,085.71; G2: 8,471.14 ± 860.08). The G2 ovaries presented a higher incidence of primary growth oocytes and post-ovulatory follicles whereas G1 ovaries had more atretic follicles. Economic analysis showed that operational profit from eggs and larvae production on G2 was higher than on G1, as well as the gross margin. In conclusion, the results showed that environmental manipulation might improve reproduction management practices extending eggs and larvae production during the natural non-breeding season. Further studies are necessary to determine more appropriate facilities to be used by farmers in large scale, as well as management protocols to ensure the survival of post-larvae.
author	Machado-Evangelista,Mariana Sussel,Fábio Rosa Romagosa,Elizabeth
author_facet	Machado-Evangelista,Mariana Sussel,Fábio Rosa Romagosa,Elizabeth
author_sort	Machado-Evangelista,Mariana
title	Environmental manipulation on Astyanax altiparanae out-of-season spawning
title_short	Environmental manipulation on Astyanax altiparanae out-of-season spawning
title_full	Environmental manipulation on Astyanax altiparanae out-of-season spawning
title_fullStr	Environmental manipulation on Astyanax altiparanae out-of-season spawning
title_full_unstemmed	Environmental manipulation on Astyanax altiparanae out-of-season spawning
title_sort	environmental manipulation on astyanax altiparanae out-of-season spawning
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=S0718-560X2019000200292
work_keys_str_mv	AT machadoevangelistamariana environmentalmanipulationonastyanaxaltiparanaeoutofseasonspawning AT susselfabiorosa environmentalmanipulationonastyanaxaltiparanaeoutofseasonspawning AT romagosaelizabeth environmentalmanipulationonastyanaxaltiparanaeoutofseasonspawning
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Environmental manipulation on Astyanax altiparanae out-of-season spawning

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