Sawfish
Sawfish are primarily found in coastal marine and estuarine brackish waters, but they are euryhaline (can adapt to various salinities) and also found in freshwater. The largetooth sawfish, alternatively called the freshwater sawfish, has the greatest affinity for freshwater. For example, it has been reported as far as up the Amazon River and in Lake Nicaragua, and its young spend the first years of their life in freshwater. In contrast, the smalltooth, green and dwarf sawfish typically avoid pure freshwater, but may occasionally move far up rivers, especially during periods when there is an increased salinity. There are reports of narrow sawfish seen far upriver, but these need confirmation and may involve misidentifications of other species of sawfish.
Satinfin shiner
It is a freshwater fish that inhabits rivers and creeks, sometimes entering pools and riffles, and found from headwaters to areas near tidal influence. It eats insects, especially flies and mayflies. Spawning occurs in spring and summer, with individuals spawning several times over a season. The eggs are laid in cracks and crevices, under rocks, and on tree roots and wood debris. The male guards them until the young emerge in about one to two weeks, depending on temperature. The lifespan of the species is 3 to 4 years.