Abstract
As seletividades de redes de emalhar para peixes forrageiros que habitam o Canal de Santa Cruz (PE, Brasil) foram estimadas a partir de um experimento com três tamanhos de malha (30, 40 e 50 mm). O SELECT foi usado para estimar as curvas de retenção através de quatro modelos: normal com dispersão fixa, normal com dispersão variável, lognormal e gama. No total foram identificadas 28 espécies. Os parí¢metros de seletividade foram estimados para as espécies Opisthonema oglinum, Anchovia clupeoides e Cetengraulis edentulus. O modelo normal com dispersão variável foi de melhor ajuste para todas as espécies. No caso da pesca da O. oglinum no Canal de Santa Cruz verificou-se que as quantidades capturadas de indivíduos jovens são particularmente mais expressivas na rede de emalhar com a malha de 30 mm. No entanto, um eventual aumento da malha indica um desvio pouco significativo da estrutura de comprimento da captura para maiores tamanhos, mas as capturas certamente seriam reduzidas. Assim, regulamentações com aumento de malha devem resultar em inviabilidade da continuidade da pesca com diminuição das capturas.
Highlights
Catches of small fish species are of great global importance, only part of them are destined for human consumption, while the largest share is used for fishmeal and fish oil production for aquaculture (TACON and METIAN, 2009)
The O. oglinum, A. clupeoides and C. edentulus species were selected for size evaluations because they stood out in the catches of all meshes evaluated
With regard to gillnet fishing in the Santa Cruz Channel (SCC), priority is given to the development of studies on O. oglinum, A. clupeoides and C. edentulus, which are caught in relatively large quantities in addition to the fishing operations carried out with the three different meshes analyzed
Summary
Catches of small fish species are of great global importance, only part of them are destined for human consumption, while the largest share is used for fishmeal and fish oil production for aquaculture (TACON and METIAN, 2009). In Brazil, fishing for forage fish is practiced in estuarine zones in an artisanal way, being mainly destined for human consumption, with great commercial importance and subsistence for several fish communities in the country. One species that stands out among the main species of fish caught is the Opisthonema oglinum, known in Brazil as the “sardine-slab” mainly, but in the Northeast the juveniles are called “manjuba” (LESSA et al, 2008).
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