Sexual maturity, spawning and fecundity of king weakfish Macrodon ancylodon, caught off Rio Grande do Sul State (southern coast of Brazil)

Detalhes bibliográficos
Autor(a) principal: Juras, Anastácio Afonso
Data de Publicação: 1989
Outros Autores: Yamaguti, Noriyoshi
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Boletim do Instituto Oceanográfico
Texto Completo: https://www.revistas.usp.br/biocean/article/view/6709
Resumo: Investigations on the sexual maturity, spawning and fecundity of king weakfish, Macrodon ancylodon, off the southern coast of Brazil (lat. 29º to 32ºS) were carried out from September, 1976, to August, 1977. The sex ratio varied monthly, with slight predominance of males (51.14%) over females (48.86%). The mean size at first maturity was estimated as 27.4 cm TL for females and 21.5 cm TL for males. The macroscopic examination of gonads and analysis of the gonadal index indicated that December and February were the most intensive spawning months. Fish weight proved to be the best predictor data of fecundity: F = 17056.2500 + 425.3712 Wt (r² = 0.6434) , were F is the total number of eggs in both ovaries. The number of eggs of 199 females varied from 59,850 for 33.4 cm TL fish to over 358,450 for 37.2 cm TL; the mean fecundity verified was 165,273 eggs per female. Frequency distributions of egg diameter in the ovaries were polymodal, suggesting fractional spawning during the reproduction season.
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spelling Sexual maturity, spawning and fecundity of king weakfish Macrodon ancylodon, caught off Rio Grande do Sul State (southern coast of Brazil) Proporção do sexoMaturação sexualÉpoca de desovaFecundidadeMacrodon ancylodonRio Grande do SulSex ratioSexual maturitySpawning seasonsFecundityMacrodon ancylodonBrazilRio Grande do Sul Investigations on the sexual maturity, spawning and fecundity of king weakfish, Macrodon ancylodon, off the southern coast of Brazil (lat. 29º to 32ºS) were carried out from September, 1976, to August, 1977. The sex ratio varied monthly, with slight predominance of males (51.14%) over females (48.86%). The mean size at first maturity was estimated as 27.4 cm TL for females and 21.5 cm TL for males. The macroscopic examination of gonads and analysis of the gonadal index indicated that December and February were the most intensive spawning months. Fish weight proved to be the best predictor data of fecundity: F = 17056.2500 + 425.3712 Wt (r² = 0.6434) , were F is the total number of eggs in both ovaries. The number of eggs of 199 females varied from 59,850 for 33.4 cm TL fish to over 358,450 for 37.2 cm TL; the mean fecundity verified was 165,273 eggs per female. Frequency distributions of egg diameter in the ovaries were polymodal, suggesting fractional spawning during the reproduction season. Universidade de São Paulo. Instituto Oceanográfico1989-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://www.revistas.usp.br/biocean/article/view/670910.1590/S1679-87591989000100005Boletim do Instituto Oceanográfico; v. 37 n. 1 (1989); 51-58 Boletim do Instituto Oceanografico; Vol. 37 No. 1 (1989); 51-58 Boletim do Instituto Oceanográfico; Vol. 37 Núm. 1 (1989); 51-58 2316-89510373-5524reponame:Boletim do Instituto Oceanográficoinstname:Instituto Oceanográfico da Universidade de São Paulo (IOUSP)instacron:USPenghttps://www.revistas.usp.br/biocean/article/view/6709/8178Juras, Anastácio AfonsoYamaguti, Noriyoshiinfo:eu-repo/semantics/openAccess2012-05-02T17:21:55Zoai:revistas.usp.br:article/6709Revistahttps://www.revistas.usp.br/bioceanPUBhttps://www.revistas.usp.br/biocean/oaiamspires@usp.br0373-55240373-5524opendoar:2012-05-02T17:21:55Boletim do Instituto Oceanográfico - Instituto Oceanográfico da Universidade de São Paulo (IOUSP)false
dc.title.none.fl_str_mv Sexual maturity, spawning and fecundity of king weakfish Macrodon ancylodon, caught off Rio Grande do Sul State (southern coast of Brazil)
title Sexual maturity, spawning and fecundity of king weakfish Macrodon ancylodon, caught off Rio Grande do Sul State (southern coast of Brazil)
spellingShingle Sexual maturity, spawning and fecundity of king weakfish Macrodon ancylodon, caught off Rio Grande do Sul State (southern coast of Brazil)
Juras, Anastácio Afonso
Proporção do sexo
Maturação sexual
Época de desova
Fecundidade
Macrodon ancylodon
Rio Grande do Sul
Sex ratio
Sexual maturity
Spawning seasons
Fecundity
Macrodon ancylodon
Brazil
Rio Grande do Sul
title_short Sexual maturity, spawning and fecundity of king weakfish Macrodon ancylodon, caught off Rio Grande do Sul State (southern coast of Brazil)
title_full Sexual maturity, spawning and fecundity of king weakfish Macrodon ancylodon, caught off Rio Grande do Sul State (southern coast of Brazil)
title_fullStr Sexual maturity, spawning and fecundity of king weakfish Macrodon ancylodon, caught off Rio Grande do Sul State (southern coast of Brazil)
title_full_unstemmed Sexual maturity, spawning and fecundity of king weakfish Macrodon ancylodon, caught off Rio Grande do Sul State (southern coast of Brazil)
title_sort Sexual maturity, spawning and fecundity of king weakfish Macrodon ancylodon, caught off Rio Grande do Sul State (southern coast of Brazil)
author Juras, Anastácio Afonso
author_facet Juras, Anastácio Afonso
Yamaguti, Noriyoshi
author_role author
author2 Yamaguti, Noriyoshi
author2_role author
dc.contributor.author.fl_str_mv Juras, Anastácio Afonso
Yamaguti, Noriyoshi
dc.subject.por.fl_str_mv Proporção do sexo
Maturação sexual
Época de desova
Fecundidade
Macrodon ancylodon
Rio Grande do Sul
Sex ratio
Sexual maturity
Spawning seasons
Fecundity
Macrodon ancylodon
Brazil
Rio Grande do Sul
topic Proporção do sexo
Maturação sexual
Época de desova
Fecundidade
Macrodon ancylodon
Rio Grande do Sul
Sex ratio
Sexual maturity
Spawning seasons
Fecundity
Macrodon ancylodon
Brazil
Rio Grande do Sul
description Investigations on the sexual maturity, spawning and fecundity of king weakfish, Macrodon ancylodon, off the southern coast of Brazil (lat. 29º to 32ºS) were carried out from September, 1976, to August, 1977. The sex ratio varied monthly, with slight predominance of males (51.14%) over females (48.86%). The mean size at first maturity was estimated as 27.4 cm TL for females and 21.5 cm TL for males. The macroscopic examination of gonads and analysis of the gonadal index indicated that December and February were the most intensive spawning months. Fish weight proved to be the best predictor data of fecundity: F = 17056.2500 + 425.3712 Wt (r² = 0.6434) , were F is the total number of eggs in both ovaries. The number of eggs of 199 females varied from 59,850 for 33.4 cm TL fish to over 358,450 for 37.2 cm TL; the mean fecundity verified was 165,273 eggs per female. Frequency distributions of egg diameter in the ovaries were polymodal, suggesting fractional spawning during the reproduction season.
publishDate 1989
dc.date.none.fl_str_mv 1989-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://www.revistas.usp.br/biocean/article/view/6709
10.1590/S1679-87591989000100005
url https://www.revistas.usp.br/biocean/article/view/6709
identifier_str_mv 10.1590/S1679-87591989000100005
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://www.revistas.usp.br/biocean/article/view/6709/8178
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade de São Paulo. Instituto Oceanográfico
publisher.none.fl_str_mv Universidade de São Paulo. Instituto Oceanográfico
dc.source.none.fl_str_mv Boletim do Instituto Oceanográfico; v. 37 n. 1 (1989); 51-58
Boletim do Instituto Oceanografico; Vol. 37 No. 1 (1989); 51-58
Boletim do Instituto Oceanográfico; Vol. 37 Núm. 1 (1989); 51-58
2316-8951
0373-5524
reponame:Boletim do Instituto Oceanográfico
instname:Instituto Oceanográfico da Universidade de São Paulo (IOUSP)
instacron:USP
instname_str Instituto Oceanográfico da Universidade de São Paulo (IOUSP)
instacron_str USP
institution USP
reponame_str Boletim do Instituto Oceanográfico
collection Boletim do Instituto Oceanográfico
repository.name.fl_str_mv Boletim do Instituto Oceanográfico - Instituto Oceanográfico da Universidade de São Paulo (IOUSP)
repository.mail.fl_str_mv amspires@usp.br
_version_ 1797049929315647488

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