Fish bycatch of the laulao catfish Brachyplatystoma vaillantii (Valenciennes, 1840) trawl fishery in the Amazon Estuary

Este estudo objetivou analisar a composicao e variacao sazonal da ictiofauna acompanhante da pesca de arrasto de Brachyplatystoma vaillantii no estuario amazonico, em 2009, atraves do monitoramento de viagens de 48 embarcacoes. A ictiofauna acompanhante representou 29% das capturas, totalizando 22.228 individuos e 52 taxons pertencentes a 22 familias, sendo estas as principais: Ariidae, Pimelodidae e Sciaenidae. Brachyplatystoma rousseauxii, Plagioscion squamosissimus e Sciades herzbergii representaram juntas 69% da captura e foram consideradas constantes. Embora o maior percentual de captura tenha ocorrido no periodo chuvoso, as diferencas sazonais nao foram significativas. Analises de ordenacao (MDS) e de similaridade (ANOSIM) mostraram que a composicao da captura entre os periodos e semelhante; entretanto, maiores capturas de B. rousseauxii e P. squamosissimus foram observadas no periodo chuvoso, enquanto S. herzbergii foi dominante no periodo seco. As guildas migrantes marinhas e especies estuarinas apresentaram maior riqueza, enquanto as migrantes dulcicolas predominaram em percentual de individuos. Considerando as guildas alimentares, as zoobentivoras apresentaram a maior riqueza, enquanto as piscivoras predominaram em abundância relativa. Os resultados indicam que a pressao pesqueira atua sensivelmente sobre os individuos de pequeno (20-30 cm) e medio (30-50 cm) porte, embora a captura de P. squamosissimus seja composta predominantemente por adultos. A captura de B. rousseauxii e B. vaillantii, entretanto, foi composta predominantemente por juvenis.

• Publication year

  2013

• Venue

  Brazilian Journal of Oceanography

• Publication date

  2013-06-01

• Fields of study

  Not labeled

• Identifiers
  DOI 10.1590/S1679-87592013000200005
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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