Effect of lobster size variation on catches on the continental shelf off Ceará, Brazil

Detalhes bibliográficos
Autor(a) principal: Neves, Soraya da Silva
Data de Publicação: 2015
Outros Autores: Gaeta, Juliana de Carvalho, Santana, João Vicente Mendes, Saraiva, Soniamar Zschornack Rodrigues, Izquierdo, Raúl Cruz
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
Texto Completo: http://www.repositorio.ufc.br/handle/riufc/28655
Resumo: In this study we evaluate to what extent variation in length class composition of P. argus at two depth ranges (1- 10 m and 30-50 m) is reflected in the overall biomass and how this affects the management of spiny lobster resources on the continental shelf off Ceará. Lobster catches consisted mainly of large juveniles (42-50 mm CL) and pre-recruits (50-73 mm CL) in shallow waters, and of adults (80-109 mm CL) at intermediate depth (30-50 m). Based on selectivity curves, the size at first capture (L50) in shallow waters was 12% smaller than the minimum legal size (MLS). A 13% or a 21% increase would be required to reach the current MLS (75 mm CL) or the ideal MLS (80 mm CL), respectively. In contrast, at intermediate depth L50 was greater than the MLS. Pre-recruits (50-73 mm CL) comprised 86% of catches (98% of the mean biomass) in shallow waters and 26.1% (55% of the mean biomass) at intermediate depth. If the L50 for shallow waters were raised to the current MLS or the ideal MLS, the biomass would increase by 79 and 84%, respectively.
id UFC-7_8c1113a559a9542bc24231eada908270
oai_identifier_str oai:repositorio.ufc.br:riufc/28655
network_acronym_str UFC-7
network_name_str Repositório Institucional da Universidade Federal do Ceará (UFC)
repository_id_str
spelling Effect of lobster size variation on catches on the continental shelf off Ceará, BrazilEfeito da variação do comprimento da lagosta sobre as capturas na plataforma continental do Ceará, BrasilPanulirusLagostaPesca da lagosta - CearáIn this study we evaluate to what extent variation in length class composition of P. argus at two depth ranges (1- 10 m and 30-50 m) is reflected in the overall biomass and how this affects the management of spiny lobster resources on the continental shelf off Ceará. Lobster catches consisted mainly of large juveniles (42-50 mm CL) and pre-recruits (50-73 mm CL) in shallow waters, and of adults (80-109 mm CL) at intermediate depth (30-50 m). Based on selectivity curves, the size at first capture (L50) in shallow waters was 12% smaller than the minimum legal size (MLS). A 13% or a 21% increase would be required to reach the current MLS (75 mm CL) or the ideal MLS (80 mm CL), respectively. In contrast, at intermediate depth L50 was greater than the MLS. Pre-recruits (50-73 mm CL) comprised 86% of catches (98% of the mean biomass) in shallow waters and 26.1% (55% of the mean biomass) at intermediate depth. If the L50 for shallow waters were raised to the current MLS or the ideal MLS, the biomass would increase by 79 and 84%, respectively.O estudo trata da variação da composição por tamanho da lagosta vermelha em duas faixas de profundidade (1-10 m and 30-50 m), para avaliar seu efeito na biomassa do recurso e suas implicações na gestão da pesca ao longo da plataforma continental cearense. Constatou-se diferença entre as distribuições de comprimento nos setores amostrados, havendo maior ocorrência de juvenis (42-50 mm CC) e pré-recrutas (50-73 mm CC) no SR e de indivíduos maiores no SI. A partir das curvas de seletividade, observou-se que, no SR, o tamanho de primeira captura (L50) foi 12% menor que o tamanho mínimo legal (TML) de 75 mm CC, sendo necessário um aumento de 13% para que o atinja, e de 21% para que atinja o tamanho mínimo ótimo (80 mm). Por outro lado, o SI apresentou L50 maior que o TML. Verificou-se também, no SR, que 86% das capturas correspondem a indivíduos pré-recrutas (50-73 mm CC), enquanto no SI, essa porcentagem caiu para 26,1%. As biomassas médias (Bm) calculadas para o SR e o SI foram constituídas por 98 e 55% de indivíduos menores que o TML, respectivamente. No SR, ao se elevar o L50 até que atinja o TML e o tamanho mínimo ótimo ocorrem incrementos de 79 e 84% na biomassa, respectivamente.Instituto de Ciências do Mar2017-12-20T18:56:31Z2017-12-20T18:56:31Z2015info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfNEVES, S. DA S. et al.Effect of lobster size variation on catches on the continental shelf off Ceará, Brazil. Arquivos de Ciências do Mar, Fortaleza, v. 48, n. 2, p. 57-66, dez. 2015.http://www.repositorio.ufc.br/handle/riufc/28655Neves, Soraya da SilvaGaeta, Juliana de CarvalhoSantana, João Vicente MendesSaraiva, Soniamar Zschornack RodriguesIzquierdo, Raúl Cruzengreponame:Repositório Institucional da Universidade Federal do Ceará (UFC)instname:Universidade Federal do Ceará (UFC)instacron:UFCinfo:eu-repo/semantics/openAccess2022-09-21T17:59:42Zoai:repositorio.ufc.br:riufc/28655Repositório InstitucionalPUBhttp://www.repositorio.ufc.br/ri-oai/requestbu@ufc.br || repositorio@ufc.bropendoar:2024-09-11T18:19:37.328831Repositório Institucional da Universidade Federal do Ceará (UFC) - Universidade Federal do Ceará (UFC)false
dc.title.none.fl_str_mv Effect of lobster size variation on catches on the continental shelf off Ceará, Brazil
Efeito da variação do comprimento da lagosta sobre as capturas na plataforma continental do Ceará, Brasil
title Effect of lobster size variation on catches on the continental shelf off Ceará, Brazil
spellingShingle Effect of lobster size variation on catches on the continental shelf off Ceará, Brazil
Neves, Soraya da Silva
Panulirus
Lagosta
Pesca da lagosta - Ceará
title_short Effect of lobster size variation on catches on the continental shelf off Ceará, Brazil
title_full Effect of lobster size variation on catches on the continental shelf off Ceará, Brazil
title_fullStr Effect of lobster size variation on catches on the continental shelf off Ceará, Brazil
title_full_unstemmed Effect of lobster size variation on catches on the continental shelf off Ceará, Brazil
title_sort Effect of lobster size variation on catches on the continental shelf off Ceará, Brazil
author Neves, Soraya da Silva
author_facet Neves, Soraya da Silva
Gaeta, Juliana de Carvalho
Santana, João Vicente Mendes
Saraiva, Soniamar Zschornack Rodrigues
Izquierdo, Raúl Cruz
author_role author
author2 Gaeta, Juliana de Carvalho
Santana, João Vicente Mendes
Saraiva, Soniamar Zschornack Rodrigues
Izquierdo, Raúl Cruz
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Neves, Soraya da Silva
Gaeta, Juliana de Carvalho
Santana, João Vicente Mendes
Saraiva, Soniamar Zschornack Rodrigues
Izquierdo, Raúl Cruz
dc.subject.por.fl_str_mv Panulirus
Lagosta
Pesca da lagosta - Ceará
topic Panulirus
Lagosta
Pesca da lagosta - Ceará
description In this study we evaluate to what extent variation in length class composition of P. argus at two depth ranges (1- 10 m and 30-50 m) is reflected in the overall biomass and how this affects the management of spiny lobster resources on the continental shelf off Ceará. Lobster catches consisted mainly of large juveniles (42-50 mm CL) and pre-recruits (50-73 mm CL) in shallow waters, and of adults (80-109 mm CL) at intermediate depth (30-50 m). Based on selectivity curves, the size at first capture (L50) in shallow waters was 12% smaller than the minimum legal size (MLS). A 13% or a 21% increase would be required to reach the current MLS (75 mm CL) or the ideal MLS (80 mm CL), respectively. In contrast, at intermediate depth L50 was greater than the MLS. Pre-recruits (50-73 mm CL) comprised 86% of catches (98% of the mean biomass) in shallow waters and 26.1% (55% of the mean biomass) at intermediate depth. If the L50 for shallow waters were raised to the current MLS or the ideal MLS, the biomass would increase by 79 and 84%, respectively.
publishDate 2015
dc.date.none.fl_str_mv 2015
2017-12-20T18:56:31Z
2017-12-20T18:56:31Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv NEVES, S. DA S. et al.Effect of lobster size variation on catches on the continental shelf off Ceará, Brazil. Arquivos de Ciências do Mar, Fortaleza, v. 48, n. 2, p. 57-66, dez. 2015.
http://www.repositorio.ufc.br/handle/riufc/28655
identifier_str_mv NEVES, S. DA S. et al.Effect of lobster size variation on catches on the continental shelf off Ceará, Brazil. Arquivos de Ciências do Mar, Fortaleza, v. 48, n. 2, p. 57-66, dez. 2015.
url http://www.repositorio.ufc.br/handle/riufc/28655
dc.language.iso.fl_str_mv eng
language eng
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 Instituto de Ciências do Mar
publisher.none.fl_str_mv Instituto de Ciências do Mar
dc.source.none.fl_str_mv reponame:Repositório Institucional da Universidade Federal do Ceará (UFC)
instname:Universidade Federal do Ceará (UFC)
instacron:UFC
instname_str Universidade Federal do Ceará (UFC)
instacron_str UFC
institution UFC
reponame_str Repositório Institucional da Universidade Federal do Ceará (UFC)
collection Repositório Institucional da Universidade Federal do Ceará (UFC)
repository.name.fl_str_mv Repositório Institucional da Universidade Federal do Ceará (UFC) - Universidade Federal do Ceará (UFC)
repository.mail.fl_str_mv bu@ufc.br || repositorio@ufc.br
_version_ 1813028756688732160

Registros relacionados