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Between 1988 and 1998, annual tuna landings at Buenaventura (ColombianPacific) are correlated with the sea surface temperature in the centralEquatorial Pacific (r=0.78, p<0.05) and the sea level height atBuenaventura (r=0.76, p<0.05) and Balboa (Panama) (r=0.79, p<0.05).Seasonal oceanic upwelling is forced by the Panama wind jet, whichmay favour oceanic fisheries such as tuna. Here we first apply a bivariatecorrelation method (Pyper and Peterman, 1994) and then a multivariateapproach (principal components analysis or PCA) to investigate therelationships of these environmental variables with landings. With the firstmethod, we find that landing is best correlated with the sea surfacetemperature in the Ni\uf1o 3 region, whereas the other relationships areless clear. In contrast, with PCA we find that PC1 explains 90.6% of thetotal variance and suggests that sea surface temperature plays a major rolein determining tuna availability in the area (especially during El Ni\uf1oevents). Since PC2 is mainly correlated with sea level height at Balboa butonly represents 6.8% of the total variance, we suggest that oceanicupwelling effects on tuna landings at Buenaventura are not significant atinterannual scales

Sea level height, sea surface temperature, and tuna yields in the Panama bight during El Niño