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Acta Amazonica

Print version ISSN 0044-5967On-line version ISSN 1809-4392

Acta Amaz. vol.29 no.3 Manaus Sept. 1999

http://dx.doi.org/10.1590/1809-43921999293476 

ZOOLOGIA

Dinâmica populacional do Surubim-tigre, Pseudoplatystoma Tigrinum (Valenciennes, 1840) no médio Amazonas (Siluriformes, Pimelodidae)

Population dynamics of striped catfish, Pseudoplatystoma tigrinum (Valenciennes, 1840) in the middle Amazon (Siluriformes, Pimelodidae)

Mauro Luis RUFFINO 1  

Victoria Judith ISAAC 2  

1Projeto IARA (IBAMA/GOPA-GTZ) — Av. Tapajós, 2267 - Cep. 68.040-000 - Santarém, PA

2Universidade Federal do Pará - Centro de Ciências Biológicas/Deptº de Biologia - Campus Universitário do Guamá — Cep. 66.075-900 - Belém, PA


RESUMO

Dados de comprimento e de captura e esforço da pesca do surubim-tigre (Pseudoplatystoma tigrinum) obtidos durante o período de 1993 a 1996, no Médio Amazonas, foram utilizados para descrever as pescarias e estimar as taxas de crescimento e mortalidade da espécie. Os parâmetros populacionais médios estimados foram Loo =180,0 cm (comprimento total), Woo = 56,56 kg, k = 0,29 ano-1, C = 0,9; WP = Novembro, M = 0,47 ano-1, Z = l ,42 ano-1, F = 0,95 ano-1 e Lc = 87,0 cm. A análise do rendimento por recruta mostra que o estoque está sendo explorado em seu limite de sustentabilidade.

Palavras-Chave: surubim-tigre; Pseudoplatystoma tigrinum; Amazônia; crescimento; mortalidade

ABSTRACT

Catch and effort data and length data series of striped catfish Pseudoplatystoma tigrinum obtained through 1993 to 1996 in the Lower Amazon, Brazil, were used to describe the fishery and to estimate growth and mortality rates. Mean population parameters estimated were = 180,0cm (total length), Woo = 56,56 kg, k = 0,29 year1, C =, WP = November, M = 0,47 year-1, Z = l,42 year1, F = 0,95 year1 e Lc = 87,0 cm. Yield-per-rccruit analysis shows that the stocks are being exploited near to limit of sustainability.

Key words: striped catfish; Pseudoplatystoma tigrinum; Amazon; growth; mortality

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