Abstract

JURADO-MOLINA, Jesús et al. Preliminary information for the small-scale yellowfin tuna fishery management in Nayarit, Mexico. Cienc. mar [online]. 2022, vol.48, e3275.  Epub Nov 17, 2023. ISSN 0185-3880.  https://doi.org/10.7773/cm.y2022.3275.

The small-scale tuna longline fishery operating on the coast of Nayarit started recently in 2013. We provide the first detailed report on some biological parameters for the yellowfin tuna (YFT) in Nayarit (Mexico). We sampled 584 YFT, representing a catch of 25.5 t. We fit the length-weight relationship, used the t-test to determine the type of growth, and estimated the selectivity curve. The total length data varied from 73.0 to 228.0 cm, with a mean of 153.0 ± 23.5 cm (mean ± SD). Weight ranged from 5.8 to 128.0 kg, with a mean of 43.7 ± 19.4 kg. Length-weight fitting results and the t-test suggested negative allometric growth. Selectivity fitting results suggested that selectivity follows an asymptotic pattern. Our results represent the first step into gathering information to establish research and monitoring programs for the YFT on the Pacific coast of Mexico. The information provided in this study could help develop proper regulations to assure a well-managed fishery and the sustainable exploitation of YFT in Nayarit.

Keywords : length-weight relationship; selectivity; yellowfin tuna; Nayarit.

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