Variação do coeficiente de capturalidade na frota arrasteira paulista dirigida ao camarão-rosa
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Data
2008-04-09
Autores
Tutui, Sergio Luiz dos Santos [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
A proposição de ações necessárias ao manejo pesqueiro requer uma base de conhecimentos dos parâmetros populacionais dos principais recursos pesqueiros, da caracterização das embarcações e estratégias de pesca, das interações entre as espécies-alvo e demais componentes do ecossistema, além das caracteristicas sócio-econômicas da atividade. Neste Caso, o entendimento da dinâmica da frota, em princípio dirigida à captura do camarão-rosa e as inter-relações com a dinâmica populacional das principais espécies da fauna acompanhante. Balistes capriscus apresentou recrutamento à pesca no primeiro semestre do ano; período reprodutivo de novembro a fevereiro e coeficientes de mortalidade de Z = 2,42 ano-1 e F = 2,21 ano-1. Os resultados indicaram que o recrutamento de Cynoscion jamaicensis deve ocorrer no primeiro semestre; o período reprodutivo é entre a primavera e o verão; coeficientes de mortalidade de Z = 0,61 ano-1 e F = 0,070 ano-1. Menticirrhus americanus apresentou recrutamento no segundo trimestre e o principal período de desova durante a primavera e o verão. Os parâmetros estimados para o modelo de crescimento de von Bertalanffy foram: L∞ = 469 mm, k = -0,18 e to = - 0,924, com estimativas de mortalidade de Z = 0,98 ano-1 e F = 0,20 ano-1. 0 recrutamento de Micropogonias furnieri ocorre entre o verão e outono; o principal período de desova é entre o final da primavera e início do verão; os coeficientes de mortalidade foram de Z = 0,49 ano-1 e F = 0,37 ano-1. As características físicas das embarcações não apresentaram correlação significativa com as capturas; por outro lado, em função das diferenças entre as capturas, determinaram-se seis sub- frotas.
The proposition of actions needed for fisheries management demands a base of knowledge on the population parameters of the main fisheries resources besides the characterization of the productive units, their fishing strategies, the interactions among the target species and other ecosystem components. In the present case, these data refer to the understanding of the dynamics of the fleet presumably targeted to capture pink shrimp and also to its interrelations with the population dynamics of the main species which compose bycatch. Among the four studied species, Batistes capriscus presented fisheries recruitment in the first half year; reproductive period from November to February and mortality rates as Z = 2,42 year-1 and F = 2,21 year-1. The Cynoscion jamaicensis recruitment to fisheries is very likely to occur in the first half year and reproductive period lasts from Spring to Summer. The mortality rates as Z = 0,61 yea-1 and F = 0,70 year-1. Menticirrhus americanus presented fisheries recruitment in the second quarter of the year; The main spawning season was during Spring and Summer; The parameters estimated for the von Bertalanffy growth model were: L∞ = 469 mm, k = -0,18 e to = - 0,924 and mortality rates as Z = 0,98 year-1 and F = 0,20 year-1. The Micropogonias furnieri recruitment to this fishery is from Summer to Autumn and reproductive period mostly occurs from late Spring to early Summer. Mortality rates as Z = 0,49 year-1 and F = 0,37 year-1. No significant correlation was verified between the boats' physical characteristics and their catch composition. By the other side, six sub-fleets were distinguished by means of their different catch compositions. Finally, the analysis results demonstrated that pink shrimp production is significantly correlated to bycatch production.
The proposition of actions needed for fisheries management demands a base of knowledge on the population parameters of the main fisheries resources besides the characterization of the productive units, their fishing strategies, the interactions among the target species and other ecosystem components. In the present case, these data refer to the understanding of the dynamics of the fleet presumably targeted to capture pink shrimp and also to its interrelations with the population dynamics of the main species which compose bycatch. Among the four studied species, Batistes capriscus presented fisheries recruitment in the first half year; reproductive period from November to February and mortality rates as Z = 2,42 year-1 and F = 2,21 year-1. The Cynoscion jamaicensis recruitment to fisheries is very likely to occur in the first half year and reproductive period lasts from Spring to Summer. The mortality rates as Z = 0,61 yea-1 and F = 0,70 year-1. Menticirrhus americanus presented fisheries recruitment in the second quarter of the year; The main spawning season was during Spring and Summer; The parameters estimated for the von Bertalanffy growth model were: L∞ = 469 mm, k = -0,18 e to = - 0,924 and mortality rates as Z = 0,98 year-1 and F = 0,20 year-1. The Micropogonias furnieri recruitment to this fishery is from Summer to Autumn and reproductive period mostly occurs from late Spring to early Summer. Mortality rates as Z = 0,49 year-1 and F = 0,37 year-1. No significant correlation was verified between the boats' physical characteristics and their catch composition. By the other side, six sub-fleets were distinguished by means of their different catch compositions. Finally, the analysis results demonstrated that pink shrimp production is significantly correlated to bycatch production.
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Palavras-chave
Pesca - São Paulo (Estado), Camarão rosa, Pesca marinha
Como citar
TUTUI, Sergio Luiz dos Santos. Variação do coeficiente de capturalidade na frota arrasteira paulista dirigida ao camarão-rosa. 2008. 133 f. Tese (doutorado) - Universidade Estadual Paulista, Instituto de Biociências de Rio Claro, 2008.