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.
African sawtail catshark
The African sawtail catshark is found along much of the western coast of Africa, from southern Morocco to the Northern Cape Province of South Africa. It is known to be abundant off Namibia and rare south of the Orange River. This species inhabits the outer continental shelf and upper continental slope between the depths of , and is most common at depths of . Found on or near the bottom, this shark can tolerate water with low levels of dissolved oxygen.