Fishers' ecological knowledge of smalleye hammerhead, Sphyrna tudes , in a tropical estuary

Autor(es)

Vinicius J. Giglio ^[1] ; Hugo Bornatowski ^[2]

Afiliação do(s) autor(es)

^[1] Universidade Federal do Rio de Janeiro. Programa de Pós-Graduação em Ecologia - Brasil

^[2] Instituto de Pesca. Divisão de Pesca Marítima - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Neotropical Ichthyology; v. 14, n. 2 2016-06-20.

Resumo

ABSTRACT Coastal hammerheads have suffered from overexploitation and environmental degradation. We interviewed 79 artisanal fishers to verify fishery aspects, temporal changes in catches and biological aspects of the smalleye hammerhead, Sphyrna tudes , in a marine protected area on Abrolhos Bank, Brazil. Data were compared between three generations of fishers: young, middle-aged and old. Fishers' age varied between 17 and 88 years. We verified significant reductions in the weight of individuals caught by younger fishers. The main types of fishing gear used to catch S. tudes were gill nets and longlines. Overfishing through gill nets and trawl fisheries were mentioned as the cause of S. tudes population collapse in the region. The shark's diet as reported by fishers consisted of fish, crab and shrimp; austral summer was the reproductive season. A strong similarity was verified between fishers' knowledge and biological data. We suggest as plausible strategies to conserve the local population of S. tudes the reduction of net fisheries impact through zoning and establishment of no take areas. These steps can help to initiate the recovery of this depleted species. (AU)

• Processo FAPESP: 13/25930-0 - A função ecológica de tubarões em diferentes ambientes abordada por um modelo trófico e por uma análise topológica
• Beneficiário: Hugo Bornatowski
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado