Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil

Detalhes bibliográficos
Autor(a) principal: Schaan,Andrea B.
Data de Publicação: 2009
Outros Autores: Giora,Júlia, Fialho,Clarice B.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Neotropical ichthyology (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400023
Resumo: The reproductive biology of a population of the weakly electric fish Brachyhypopomus draco from southern Brazil is described. Information is provided on the establishment of the reproductive period in this species and its relations with environmental and feeding factors, as well as on the absolute and relative fecundities, spawning type, sex ratio and sexual dimorphism. The species exhibits a relatively long reproductive period, a relative fecundity of 0.173 oocytes per mg of female total weight, and fractional spawning. The sex ratio did not differ from 1:1 during all sampled months. Sexual dimorphism related to hypertrophy of the male's distal portion of caudal filament was observed and males grew to greater lengths than females. Male gonadosomatic index (GSI) was significantly related to water depth, oxygen saturation and temperature. Female GSI was significantly related to water depth and hepatosomatic index.
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spelling Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern BrazilReproductionGymnotiformesAbiotic factorsLaguna dos Patos systemParque Estadual de ItapuãThe reproductive biology of a population of the weakly electric fish Brachyhypopomus draco from southern Brazil is described. Information is provided on the establishment of the reproductive period in this species and its relations with environmental and feeding factors, as well as on the absolute and relative fecundities, spawning type, sex ratio and sexual dimorphism. The species exhibits a relatively long reproductive period, a relative fecundity of 0.173 oocytes per mg of female total weight, and fractional spawning. The sex ratio did not differ from 1:1 during all sampled months. Sexual dimorphism related to hypertrophy of the male's distal portion of caudal filament was observed and males grew to greater lengths than females. Male gonadosomatic index (GSI) was significantly related to water depth, oxygen saturation and temperature. Female GSI was significantly related to water depth and hepatosomatic index.Sociedade Brasileira de Ictiologia2009-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400023Neotropical Ichthyology v.7 n.4 2009reponame:Neotropical ichthyology (Online)instname:Sociedade Brasileira de Ictiologia (SBI)instacron:SBI10.1590/S1679-62252009000400023info:eu-repo/semantics/openAccessSchaan,Andrea B.Giora,JúliaFialho,Clarice B.eng2010-01-18T00:00:00Zoai:scielo:S1679-62252009000400023Revistahttp://www.ufrgs.br/ni/https://old.scielo.br/oai/scielo-oai.php||neoichth@nupelia.uem.br1982-02241679-6225opendoar:2010-01-18T00:00Neotropical ichthyology (Online) - Sociedade Brasileira de Ictiologia (SBI)false
dc.title.none.fl_str_mv Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil
title Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil
spellingShingle Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil
Schaan,Andrea B.
Reproduction
Gymnotiformes
Abiotic factors
Laguna dos Patos system
Parque Estadual de Itapuã
title_short Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil
title_full Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil
title_fullStr Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil
title_full_unstemmed Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil
title_sort Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil
author Schaan,Andrea B.
author_facet Schaan,Andrea B.
Giora,Júlia
Fialho,Clarice B.
author_role author
author2 Giora,Júlia
Fialho,Clarice B.
author2_role author
author
dc.contributor.author.fl_str_mv Schaan,Andrea B.
Giora,Júlia
Fialho,Clarice B.
dc.subject.por.fl_str_mv Reproduction
Gymnotiformes
Abiotic factors
Laguna dos Patos system
Parque Estadual de Itapuã
topic Reproduction
Gymnotiformes
Abiotic factors
Laguna dos Patos system
Parque Estadual de Itapuã
description The reproductive biology of a population of the weakly electric fish Brachyhypopomus draco from southern Brazil is described. Information is provided on the establishment of the reproductive period in this species and its relations with environmental and feeding factors, as well as on the absolute and relative fecundities, spawning type, sex ratio and sexual dimorphism. The species exhibits a relatively long reproductive period, a relative fecundity of 0.173 oocytes per mg of female total weight, and fractional spawning. The sex ratio did not differ from 1:1 during all sampled months. Sexual dimorphism related to hypertrophy of the male's distal portion of caudal filament was observed and males grew to greater lengths than females. Male gonadosomatic index (GSI) was significantly related to water depth, oxygen saturation and temperature. Female GSI was significantly related to water depth and hepatosomatic index.
publishDate 2009
dc.date.none.fl_str_mv 2009-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400023
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400023
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1679-62252009000400023
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Ictiologia
publisher.none.fl_str_mv Sociedade Brasileira de Ictiologia
dc.source.none.fl_str_mv Neotropical Ichthyology v.7 n.4 2009
reponame:Neotropical ichthyology (Online)
instname:Sociedade Brasileira de Ictiologia (SBI)
instacron:SBI
instname_str Sociedade Brasileira de Ictiologia (SBI)
instacron_str SBI
institution SBI
reponame_str Neotropical ichthyology (Online)
collection Neotropical ichthyology (Online)
repository.name.fl_str_mv Neotropical ichthyology (Online) - Sociedade Brasileira de Ictiologia (SBI)
repository.mail.fl_str_mv ||neoichth@nupelia.uem.br
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