Eleutheronema tetradactylum, also known as Indian Salmon, is a threadfin

Threadfin

Threadfins are silvery grey perciform marine fish of the family Polynemidae. Found in tropical to subtropical waters throughout the world, the threadfin family contains nine genera and 33 species...

 fish of the Polynemidae family. This highly commercial fish known for uses in aquaculture occur mainly over shallow muddy bottoms in coastal waters forming loose schools. Adults of this highly vulnerable species enter rivers during winter. Adults feed on prawns and fish with occasional polychaetes, while juveniles feed on prawns shrimps and mysids.