Population structure and reproductive biology of Loricariichthys melanocheilus Reis & Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil

Detalhes bibliográficos
Autor(a) principal: Zardo,Éverton Luís
Data de Publicação: 2015
Outros Autores: Behr,Everton Rodolfo
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Neotropical ichthyology (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200371
Resumo: The objective of this study was to analyze population structure (spatial distribution, seasonal distribution and distribution by length classes, sex ratio and length-weight relationship) and aspects of the reproductive biology of Loricariichthys melanocheilus. Fish were sampled bimonthly using gillnets and trammel nets in lentic and lotic environments in the rio Ibicuí, between the years 2000 and 2001. Were collected 410 specimens: 230 females, 164 males and 16 specimens whose sex could not be determined. A greater number of specimens were collected in October/November and December/January and in lentic environments. The greater length classes had a higher amount of females (p < 0.05) and the sex ratio in all sampling periods was 1.38 females per male. Both males and females showed positive allometric growth (b = 3.299 and b =3.487, respectively). The highest values for gonadosomatic index (GSI) and gonadal condition factor (K) were observed from August/September and peaked in October/November, just like the highest frequencies of females at maturity stage C (mature), which is indicative that the breeding season occurs at this time.
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spelling Population structure and reproductive biology of Loricariichthys melanocheilus Reis &amp; Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, BrazilArmored catfishBreeding seasonCondition factorGonadosomatic indexHepatosomatic indexThe objective of this study was to analyze population structure (spatial distribution, seasonal distribution and distribution by length classes, sex ratio and length-weight relationship) and aspects of the reproductive biology of Loricariichthys melanocheilus. Fish were sampled bimonthly using gillnets and trammel nets in lentic and lotic environments in the rio Ibicuí, between the years 2000 and 2001. Were collected 410 specimens: 230 females, 164 males and 16 specimens whose sex could not be determined. A greater number of specimens were collected in October/November and December/January and in lentic environments. The greater length classes had a higher amount of females (p < 0.05) and the sex ratio in all sampling periods was 1.38 females per male. Both males and females showed positive allometric growth (b = 3.299 and b =3.487, respectively). The highest values for gonadosomatic index (GSI) and gonadal condition factor (K) were observed from August/September and peaked in October/November, just like the highest frequencies of females at maturity stage C (mature), which is indicative that the breeding season occurs at this time.Sociedade Brasileira de Ictiologia2015-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200371Neotropical Ichthyology v.13 n.2 2015reponame:Neotropical ichthyology (Online)instname:Sociedade Brasileira de Ictiologia (SBI)instacron:SBI10.1590/1982-0224-20140052info:eu-repo/semantics/openAccessZardo,Éverton LuísBehr,Everton Rodolfoeng2016-07-07T00:00:00Zoai:scielo:S1679-62252015000200371Revistahttp://www.ufrgs.br/ni/https://old.scielo.br/oai/scielo-oai.php||neoichth@nupelia.uem.br1982-02241679-6225opendoar:2016-07-07T00:00Neotropical ichthyology (Online) - Sociedade Brasileira de Ictiologia (SBI)false
dc.title.none.fl_str_mv Population structure and reproductive biology of Loricariichthys melanocheilus Reis &amp; Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil
title Population structure and reproductive biology of Loricariichthys melanocheilus Reis &amp; Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil
spellingShingle Population structure and reproductive biology of Loricariichthys melanocheilus Reis &amp; Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil
Zardo,Éverton Luís
Armored catfish
Breeding season
Condition factor
Gonadosomatic index
Hepatosomatic index
title_short Population structure and reproductive biology of Loricariichthys melanocheilus Reis &amp; Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil
title_full Population structure and reproductive biology of Loricariichthys melanocheilus Reis &amp; Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil
title_fullStr Population structure and reproductive biology of Loricariichthys melanocheilus Reis &amp; Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil
title_full_unstemmed Population structure and reproductive biology of Loricariichthys melanocheilus Reis &amp; Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil
title_sort Population structure and reproductive biology of Loricariichthys melanocheilus Reis &amp; Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil
author Zardo,Éverton Luís
author_facet Zardo,Éverton Luís
Behr,Everton Rodolfo
author_role author
author2 Behr,Everton Rodolfo
author2_role author
dc.contributor.author.fl_str_mv Zardo,Éverton Luís
Behr,Everton Rodolfo
dc.subject.por.fl_str_mv Armored catfish
Breeding season
Condition factor
Gonadosomatic index
Hepatosomatic index
topic Armored catfish
Breeding season
Condition factor
Gonadosomatic index
Hepatosomatic index
description The objective of this study was to analyze population structure (spatial distribution, seasonal distribution and distribution by length classes, sex ratio and length-weight relationship) and aspects of the reproductive biology of Loricariichthys melanocheilus. Fish were sampled bimonthly using gillnets and trammel nets in lentic and lotic environments in the rio Ibicuí, between the years 2000 and 2001. Were collected 410 specimens: 230 females, 164 males and 16 specimens whose sex could not be determined. A greater number of specimens were collected in October/November and December/January and in lentic environments. The greater length classes had a higher amount of females (p < 0.05) and the sex ratio in all sampling periods was 1.38 females per male. Both males and females showed positive allometric growth (b = 3.299 and b =3.487, respectively). The highest values for gonadosomatic index (GSI) and gonadal condition factor (K) were observed from August/September and peaked in October/November, just like the highest frequencies of females at maturity stage C (mature), which is indicative that the breeding season occurs at this time.
publishDate 2015
dc.date.none.fl_str_mv 2015-06-01
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=S1679-62252015000200371
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200371
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/1982-0224-20140052
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.13 n.2 2015
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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