Habitat
Sailfin mollies are most commonly observed as the shallow surface waters along the edges of marshes, lowland streams, ponds, swamps, estuaries and even ephemeral water bodies such as roadside ditches. Small to large aggregations of the species are most commonly found under floating vegetation or near structures in the water, minimizing their chances of being observed by potential predators.
The sailfin molly is a tolerant species, as it can exploit the thin film of oxygen-rich surface water with its upturned mouth, so is able to survive oxygen-depleted habitats. A euryhaline species, the sailfin molly may be found in a variety of saline environments, tolerating salinities as high as 87 ppt and breeding in brackish waters.
Adults thrive best in isolated pools or organically enriched waterways where few other fish occur (Minckley 1973).
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