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¹ Instituto Nacional de Pesca y Acuacultura. Centro Regional de Investigación Acuícola y Pesquera (CRIAP) La Paz, Baja California Sur, México.
² Facultad de Ecología Marina, Universidad Autónoma de Guerrero (UAGro), C.P. 39390, Acapulco Guerrero México
³ Dirección de Cátedras-CONACYT, Consejo Nacional de Ciencia y Tecnología (CONACYT), C.P. 03940, Ciudad de México, México
⁴ Centro de Investigaciones Biológicas del Noroeste (CIBNOR), S.C., Unidad Sonora, Campus Guaymas. Guaymas, Sonora, México.
⁵ University of Belize, Belmopan Campus, Cayo, Belize DOI : 10.4194/1303-2712-v20_12_01 Viewed : 2020 - Downloaded : 1299 Graceful mojarra (Eucinostomus gracilis) is an important component of the ichthyic fauna of lagoon systems but knowledge of its population aspects is scarce. Monthly samples in the Magdalena-Almejas Lagoon system (March-August, 2014-2017) were obtained with a trawling net. Abundance was estimated using the swept area method and its spatial variation; and the maturity size was determined using the logistic method. The sex ratio for mature and immature populations, and their length-weight relationship were estimated; FISAT was used to estimate the growth and recruitment parameters. Abundance ranged from 0.6 to 203 ind-Ha^-1 with changes for each lagoon system areas and among years. Size at maturity (L₅₀) was 132 mm in total length (TL) for the population, 129 mm TL females, and 135 mm TL males. Considering the population of the total organisms, L₅₀ indicated that 18% were adults and 82% were juveniles. Juvenile dominance indicated that this lagoon system is used for grow-out. The smaller ratio of adult organisms does not allow asserting assertion that the priority of the area is for reproduction. E. gracilis showed moderate growth (K = 0.56 year^-1) with longevity of 5.4 years and asymptotic length of L_∞ = 195 mm. Keywords : Eucinostomus gracillis, Magdalena Bay, Size at maturity, Growth, Recruitment