views updated

Polynemidae (threadfin; subclass Actinopterygii, order Perciformes) A family of marine, coastal fish that have an elongate body, large eyes, two separate dorsal fins, a forked tail, and, typically, pectoral fins that are divided into two sections, the foremost section consisting of a number of filamentous fin rays. The threadfins are a commercially important group of fish. They are distributed worldwide in tropical and subtropical seas. There are about 35 species.