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.
Longcomb sawfish
Little is known of its life cycle, but it is ovoviviparous and the young are long at birth. It is often said that there are about 12 young in each litter, but the basis for this number is unclear (in other sawfish species litter size ranges from 1 to 20). The females give birth in inshore areas, and the young stay near the coast and in estuaries in the first part of their lives. Sexual maturity is reached at an age of about 9 years, and a length of . The maximum age is unknown, but it might be in excess of 50 years, and an individual caught as a juvenile lived for 35 years at an aquarium.