Resumen del producto

The striped marlin is the primary target of the sport fishery operating out of Cabo San Lucas, Baja CaliforniaSur, Mexico. Recreational fishery log books indicated that striped marlin constitute approximately 80%of annual billfish catches by the local sport fishing fleet. Generalized additive models were used to iden-tify major environmental factors that affect the distribution of striped marlin where the recreationalfishery operates. For statistical modeling, the nominal catch rate (number of fish per trip) was used asthe response variable and environmental, spatial, and temporal variables were used as the predictorvariables. Exceptionally high catch rates were recorded in late 2008 and early 2009 (>5 striped marlinper trip), which followed observations of high concentrations of chlorophyll-a during the previous sixmonths. Seasonal variations with greater catch rates during the late fall and winter were found. The bestmodel showed that high catch rate of striped marlin occurs when warm temperatures (26–28?C), highchlorophyll-a concentration (>1 mg m?3), and negative values of PDO index (<?1) are present, mainly dur-ing late autumn and early winter (December–February). Physical factors such as geographical positionand depth of seafloor, showed that highest catch rates are present in western coast of Los Cabos (centeredat 23?N, 110?W: Golden Gate bank). Bathymetry data with higher spatial resolution (?4 × 4 km) showedthe presence of seamounts in this hot spot area for striped marlin.

Palabras clave: Striped marlin; Distribution; generalized additive model; Environmental factors

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