The shortfin molly Poecilia mexicana Steindachner, 1863, has a wide distribution in southeastern Mexico where it inhabits rivers and coastal lagoons. In the Alvarado Lagoonal System, Veracruz, it is distributed towards the northeast in Camaronera Lagoon. The shortfin molly shows an affinity for oligohaline to mesohaline sites with submerged vegetation, well-oxygenated, and transparent water. The major abundance and biomass of this species was obtained during December to February. The diet of

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... rtfin molly consists principally of algae. Length-frequency distribution shows two size classes as most numerous during all seasons (41 to 50 and 51 to 60 mm respectively), corresponding to reproductive fish and young of the year; individuals with developed gonads were found throughout the year, although most reproductive adults were found between April and December. The Gonadosomatic Index (GSI) high values were founded in reproductive females. Fecundity ranged from 21 to 116 eggs/female, and 19 to 83 embryos/female.