It may also enter estuaries and river deltas, and has been reported to move upstream into rivers in some areas, although its occurrence in freshwater has yet to be verified (1) (2) (4) (5).Relatively little is known about the diet of the knifetooth sawfish, although it is believed to feed on small fish and invertebrates, such as crabs, squid and shrimps, slashing the saw back and forth to stun or