Comparative study of skipjack tuna Katsuwonus pelamis (Scombridae) fishery stocks from the South Atlantic and western Indian oceans

Autor(es)

Dahlet, I, Lol ; Downey-Breedt, Nicola ^[1] ; Arce, Gabriel ^[2] ; Sauer, Warwick H. H. ^[1] ; Gasalla, Maria A. ^{[2, 3]}

Afiliação do(s) autor(es)

^[1] Rhodes Univ, Dept Ichthyol & Fisheries Sci, Prince Alfred St POB 94, ZA-6140 Grahamstown - South Africa

^[2] Dahlet, Lol, I, Univ Sao Paulo, Fisheries Ecosyst Lab LabPesq, Oceanog Inst, 191 Praca Oceanog, Cidade Univ, Sao Paulo, SP - Brazil

^[3] Univ Sao Paulo, Inst Adv Studies IEA, 513 Rua Anfiteatro, Cidade Univ, Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Scientia Marina; v. 83, n. 1, p. 19-30, MAR 2019.
• Citações Web of Science: 0

Resumo

The skipjack tuna, Katsuwonus pelamis, inhabits tropical and subtropical oceans the world over, and contributes substantially to total tuna catches. Both fishing pressure and anthropic influences affect skipjack populations, impacting on economic returns and investment. The present study analyses and compares spatial time series of catch and catch per unit effort (CPIJE), of pole-and-line fishing of skipjack tuna from Brazil, South Africa and the Maldives. Both regional and interregional analyses were conducted for the period 1970-2014 in order to ultimately investigate potential associations between these fisheries, climatic conditions and the El Nifio Southern Oscillation (ENSO). Correlation tests and spatial mapping tools were used. From 2004 to 2011, South African skipjack catches correlated positively with Brazilian ones and negatively with Maldivians. CPUEs from the Brazilian and Maldivian skipjack fisheries showed a significant positive correlation in the period 1982-1993. Yearly catches from all regions were strongly associated with the Northern Oscillation Index (p<0.001), an ENSO index. This study reflects an effort to articulate an inter-regional appraisal of skipjack pole-and-line fisheries embedded in the context of a globally changing climate, in the face of which emerging economies are the most vulnerable. Evidence of common patterns influencing these fisheries should encourage international South-South cooperative management and understanding of the resource. (AU)

• Processo FAPESP: 12/51873-1 - Aprendizado global para soluções locais: reduzindo a vulnerabilidade das comunidades costeiras dependentes do mar
• Beneficiário: Maria de Los Angeles Gasalla
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular