Abstract

RUIZ-RAMIREZ, Salvador et al. Reproductive biology of the Polla Drum Umbrina xanti (Perciformes: Sciaenidae) in the central Mexican Pacific. Cienc. mar [online]. 2025, vol.51, e3483.  Epub May 23, 2025. ISSN 0185-3880.  https://doi.org/10.7773/cm.y2025.3483.

The Polla Drum Umbrina xanti is a commercially important species off the coast of Jalisco. However, as is the case with most of the fisheries in the country, information on the life history of this species is very limited. Thus, this work aimed to analyze the length at sexual maturity, reproductive season, and microscopic description of the gonads, among other aspects. Organisms were collected from 1998 to 2008 with gill nets by artisanal fisheries operating in the central Mexican Pacific. The gonadosomatic index (GSI), sexual maturity stages, oocyte diameter, condition factor, and sexual ratio were analyzed per month. Histology of the gonads was performed, and the average length of maturation was estimated. In total, 1,202 organisms between 17.9 and 42.3 cm TL were captured. The number of females was greater than that of males (1:0.88). The highest percentages of mature individuals occurred in February and in April-May. The GSI had maximum values from January to May. The largest oocyte diameters occurred from March to June. Oocyte development was asynchronous, and the testis showed unrestricted lobular-type development. The average maturation length for females was 27.37 and 28.78 cm for males. Because these average lengths at maturity were less than the average length, we can indicate that more than 50% of the organisms caught by commercial fishing had had a reproductive event.

Keywords : reproduction; gonadosomatic index; length at maturity; Polla Drum; asynchronous development; lobular organization; oocyte diameter.

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