The Bloch's gizzard shad (Nematalosa nasus), also known as gizzard shad, hairback, long-finned gizzard shad, long-ray bony bream and thread-finned gizzard shad, are a widespread and common, small to medium-sized anadromous fish found in all marine, freshwater and brackish waters throughout Indo-West Pacific, towards eastward of Andaman Sea, South China Sea and the Philippines to Korean peninsula.

Single specimen recorded from waters of South Africa.

The sardines are known to swim at a maximum depth of 30 metres.

The largest known standard length for the species is 22 cm.

[2] The fish can separate from its sister species by the presence of a dark spot behind gill opening.