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The butterfly kingfish, bigscale mackerel, or butterfly mackerel, (Gasterochisma melampus), the only species in the genus Gasterochisma, is found around the world in southern temperate waters, down to 200 metres in open water. Its length is up to 2 metres.
The butterfly kingfish changes its appearance as it grows. Young fish are elongate with a pointed snout, no lateral keels on the caudal peduncle, and have large fan-like pectoral fins that fold into a deep groove along the mid-line of the belly. In large adults the head becomes larger and blunter, the first dorsal fin becomes lower and widely separate from the second dorsal, a pair of lateral keels develop on each side of the caudal peduncle, and the pelvic fins shrink to more normal size.
The body is completely covered in large rough scales. Butterfly kingfish are metallic blue-black on the back, with silver flanks and belly, silver pectoral fins, the other fins being black.
Butterfly kingfish
| | Name | Butterfly kingfish | | image |  | | Regnum | Animalia | | Phylum | Chordata | | Classis | Actinopterygii | | Ordo | Perciformes | | Familia | Scombridae | | Genus | Gasterochisma | | Genus Authority | John Richardson (naturalist) | | Species | G. melampus | | Binomial | Gasterochisma melampus | | Binomial Authority | John Richardson (naturalist) |
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