Eleutheronema tetradactylum, also known as fourfinger threadfin, Indian salmon, blue threadfin, or Rawas, is a threadfin fish of the Polynemidae family. This is a commercially valuable species, known for uses in aquaculture. It occurs mainly over shallow muddy bottoms in coastal waters, often forming loose schools. Adults of this species enter rivers during winter. Adults feed on prawns, fish, and occasionally polychaetes, while juveniles feed on prawns, shrimps, and mysids. This species is vulnerable to overfishing.. This Indian Salmon is widely known as Gurjali fish in Bangladesh. it is also found in the water ecosystem normally seen in fresh water.