Abstract

MORAN-ANGULO, Ramón Enrique et al. Population structure of Atrina oldroydii bed (Mollusca, Bivalvia) of the Mexican Eastern Pacific. Ecosistemas y recur. agropecuarios [online]. 2015, vol.2, n.6, pp.363-369. ISSN 2007-901X.

The male: female ratio of 421 specimens of the black pen shell Atrina (Servatrina) oldroydii Dali 1901, obtained between july and december 2007 from a natural bed detected in the Mexican Pacific between the states of Sinaloa and Nayarit and exploited until its disappearance, was 1 male: 1.23 females, with a significant female dominance. Mean shell length and width were 24.7 ± 1.8 and 15.4 ± 1.2 cm, and the mean total weight and that of the adductor muscle were 303.5 ± 86.46 y 19.5 ± 7 g respectively. Size and weight distributions were unimodal, indicating a single generation population, and their analysis indicated isometric growth with no significant differences between mean sizes, weights and size-to weight relationships of males and females.

Keywords : Black scallop; size; weight; gender ratio; gonad maturity.