noun
longtail tuna; northern bluefin tuna
Refers to Thunnus tonggol, a species of tuna. The gloss 'northern bluefin tuna' may be a misnomer; longtail tuna is the standard English name.
コシナガはインド洋や西太平洋で漁獲される。
Longtail tuna is caught in the Indian Ocean and western Pacific.
市場でコシナガを見かけることは少ない。
It is rare to see longtail tuna at the market.
The name コシナガ likely derives from 腰 (こし, 'waist') and 長 (なが, 'long'), referring to the fish's elongated body shape. The exact origin is uncertain.