Heterandria formosa (Figure 3), belongs to the life-bearers (Poeciliidae) and is native to different freshwater habitats in the south-eastern parts of the United States of America (Figure 4). Populations can be found from southern North Carolina to southern Texas (Page & Burr 1991; Page & Burr 2011). Heterandria formosa occupies many different microhabitats. Generally, the species prefers vegetated standing water bodies, marshes, or slow-flowing streams. Salt concentrations, mostly on peninsular Florida, can be tolerated up to 30ppt (Lee et al. 1980; Page & Burr 2011). Heterandria formosa is omnivorous and their main diet is comprised out of small aquatic invertebrates (ostracods, copepods) (Boschung & Mayden 2004).
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