The Halfmoon is also called as Blue Perch. It has a scientific name Medialuna californiensis. The halfmoon fish belong to the family Kyphosidae of the genus Medialuna.
The fish has a small pointed head, oval compressed body. The Halfmoon has its dorsal part of dark bluish grey, slightly pale ventrally and vertical bars along the flanks. The outer of the caudal fin is white.
These fishes are endemic to the Pacific Ocean (Eastern) of North America and are found in the middle depths over Kelp. These fishes like to swim around kelp forests, kelp pads, oil rigs and reefs etc.
It is a popular catch by anglers and is also a bycatch. Moreover, it is really an appreciated catch considering its food value and is relished by cooking in several ways.