Gillnet selectivity for forage fish with emphasis on manjuba (Opisthonema oglinum) in an estuary in the northeast of Brazil

  • Severino Adriano de Oliveira LIMA Universidade Federal Rural de Pernambuco – UFRPE, Programa de Pós-graduação em Recursos Pesqueiros e Aquicultura
  • Humber Agrelli ANDRADE Universidade Federal Rural de Pernambuco – UFRPE, Departamento de Pesca e Aquicultura

Abstract

The selectivity of gillnets for the inhabiting forage fish community in the Santa Cruz Channel (PE, Brazil) was estimated an experiment using three mesh sizes (30, 40 and 50 mm). The SELECT was used to estimate retention curves through four models: normal location, normal scale, lognormal and gamma. Aggregated as catches in all fisheries, 28 species were identified. Selectivity parameters for species Opisthonema oglinum, Anchovia clupeoides and Cetengraulis edentulous were estimated. The normal scale model gave the best fit for all species studied. In the case of O. oglinum fishing in the Santa Cruz Channel the catches of young individuals are particularly significant in gillnets with a 30 mm mesh size. However, a possible increase in mesh size indicates little change in the length structure of the catch for larger sizes, but catches would certainly be reduced. Thus, regulations with increased mesh size should result in non-viability of fishing continuity with reduced catches.

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Published
2018-12-22
How to Cite
LIMA, Severino Adriano de Oliveira; ANDRADE, Humber Agrelli. Gillnet selectivity for forage fish with emphasis on manjuba (Opisthonema oglinum) in an estuary in the northeast of Brazil. Boletim do Instituto de Pesca, [S.l.], v. 44, n. 3, p. 379-387, dec. 2018. ISSN 1678-2305. Available at: <https://www.pesca.sp.gov.br/boletim/index.php/bip/article/view/1303>. Date accessed: 25 may 2022. doi: https://doi.org/10.20950/1678-2305.2018.225.