Indirect signals of spawning aggregations of three commercial reef fish species on the continental shelf of Bahia, east coast of Brazil

Authors

  • Aline Rocha França Universidade Estadual de Feira de Santana; Programa de Pós-Graduação em Modelagem em Ciências da Terra e do Ambiente; Laboratório de Biologia Pesqueira
  • George Olavo Universidade Estadual de Feira de Santana; Programa de Pós-Graduação em Modelagem em Ciências da Terra e do Ambiente; Laboratório de Biologia Pesqueira

DOI:

https://doi.org/10.1590/S1679-87592015087506303

Abstract

Lutjanus analis (Mutton snapper), Lutjanus jocu(Dog snapper) and Mycteroperca bonaci (Black grouper) are reef fishes of high commercial value, and are among the principal exploited reef resources on the eastern and northeastern coast of Brazil. These species share the habit of forming transient spawning aggregations, predictable in time and space, which leaves them particularly vulnerable. The present study aimed to obtain indirect indicators of periods and places of spawning aggregations for these species, based on the exploratory analysis of available data on commercial catches and fishing efforts in Southern Bahia. Line fishery landings data were monitored in 12 locations in the region, and catch records of Mutton snapper (1320 landings), Dog snapper (654) and Black grouper (1162) were analyzed. A strategy was developed for exploratory analysis of monthly CPUE variation and individual distribution of CPUE per trip. The results showed the occurrence of aggregations in 26 specific sites, with values of relative abundance far above the annual mean, during spring/summer and autumn/winter. The occurrence of these anomalous catches was validated with the fishermen responsible for respective fishing trips. Additional studies are needed to confirm spawning activity at these sites. Analysis of inter-annual variation suggests a decreasing trend in relative abundance of Black grouper and Mutton snapper, possibly associated with unregulated fishing of spawning aggregations.

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Published

2015-09-01

How to Cite

França, A. R., & Olavo, G. (2015). Indirect signals of spawning aggregations of three commercial reef fish species on the continental shelf of Bahia, east coast of Brazil . Brazilian Journal of Oceanography, 63(3), 289-301. https://doi.org/10.1590/S1679-87592015087506303

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Section

Original Article