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The roosterfish Nematistius pectoralis is a large coastal pelagic that inhabits shallow waters of the Eastern Pacific Ocean. Age and individual growth parameters are key for the evaluation of fishery resources, however, there is only one parameters estimate published for the species. From 2010 to 2015, 563 organisms were sampled in Cabo San Lucas, La Paz and San Carlos, B.C.S., of which were registered the furcal length (LF), weight, sex and collected the dorsal fin, sagittae otoliths and scales. The size range sampled was from 5.2 to 133 cm LF, organisms of 40 to 80 cm predominated (59% of the total number of specimens). The length-weight relationship indicated a negative allometric growth (b = 2.73) without significant differences between sexes (p> 0.05). Taking the highest R² value (R² = 0.95) of the linear relationship between the radius of the hard structures (Rt) and LF, as well as the value of the lowest coefficient of variation (CV = 5.67), of the three hard structures analyzed, the otoliths were the most suitable for estimating age. The validation of the annual formation of otoliths increment was established by the regularity of the deposition of the hyaline and opaque rings in the edge of the otoliths. This allowed the determination of the formation of an annual hyaline in June and an opaque ring in September-October. The age groups disembarked in Baja California Sur were 9 (0 - 8), groups 1 and 2 being the most abundant. To the data of size-age, three models of individual growth were adjusted (von Bertalanffy, Gompertz and Logistic), according to the values ??of the Akaike information criterion, the von Bertalanffy model is that better describes the individual growth of the species (L8 = 132.98, k = 0.34, t0 = -0.17).

Palabras clave: Age; fin spines; individual growth; Nemaistius pectoralis; sport fishing

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