Produção Nacional
Revisado por pares
Seletividade da rede malhadeira-fixa para a captura do mapará, Hypophthalmus marginatus, no reservatório da usina hidrelétrica de Tucuruí, Estado do Pará, Brasil
2011; INSTITUTO DE PESCA - APTA - SEC. DE AGR. E ABAST. - SP; Volume: 37; Issue: 2 Linguagem: Inglês
ISSN
1678-2305
AutoresJeronimo Carvalho Martins, Anastácio A. Juras, Marlon Albert dos Santos Araujo, Adauto dos Santos Mello-Filho, Israel Hidenburgo Aniceto Cintra,
Tópico(s)Fish Ecology and Management Studies
ResumoThe aim of this work was to establish the most selective size of the net used to catch mapara, Hypophthalmus marginatus (Valenciennes, 1840). The study was developed in the reservoir of UHETucurui, by using experimental fisheries every three months from January 2001 to June 2006. It was used net with 50 meters in length and 3 meters high with mesh sizes from 40 to 200mm. All fishes caught were identified, measured and weighted. The selectivity curves were estimated by determination of the selection factor, sample variation and optimum animal size. The fishes mapara were caught in net with mesh size from 20 to 140 mm (1,424 fishes). The mesh size of 80 mm was responsible for the higher proportion of catch (45.4%). Once confirmed the linear relation between Ln(Cb/Ca) and the class center (L) for gillnet pairs studied were estimated the selectivity curves. According to these curves, the 80 mm mesh gillnet present an optimum length of catch equal to 422.13 mm, what represent a length above the length of the first reproductive cycle (410.00 mm). The amplitude of selection goes from 265.27 to 578.99 mm, indicating that approximately 50% of fishes caught are adult. It is suggested, therefore, the use of gill nets with mesh sizes equal or than 80 mm between opposite knots, to assist in the drafting of specific legislation, besides tracking of the selectivity and the average length of capture
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