Sebastes inermis (Japanese red rockfish, Japanese red sea perch) is a species of rockfish native to the northwestern Pacific Ocean where it occurs off the coasts of Japan and the Korean Peninsula. This species grows to a length of 35 centimetres (14 in) TL and the heaviest recorded specimen weighed 800 grams (1.8 lb). This fish is important to both commercial fisheries and the sport fishing industry. It is also raised to supply market demand. The Japanese sea-perches are twice more expensive than that European sea-bass. Sometimes the Japanese seaperch mix up Japanese seaperch and Japanese seabass.