Sexual maturity, spawning and fecundity of king weakfish Macrodon ancylodon, caught off Rio Grande do Sul State (southern coast of Brazil)
Autor(a) principal: | |
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Data de Publicação: | 1989 |
Outros Autores: | |
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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Boletim do Instituto Oceanográfico |
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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 |