Freshwater

Freshwater fish spend part or all of their lives in fresh water, such as rivers and lakes, with a salinity of less than 1.05%.

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Gambusia holbrooki

The body of the Eastern mosquitofish is moderately elongated, not tall, and laterally compressed. It is …

Heterandria formosa

Least killifish differ little in body shape from their closest relatives, the Poecilia. They have an …

Gambusia affinis affinis

The male anal fin is modified and is an intermittent organ for introducing sperm into the …