The blue knifefish (Labracoglossa nitida) is a species of marine  ray-finned fish, a member of the subfamily Scorpidinae of the sea chub family Kyphosidae.
In the ocean, there exists a particular type of fish known as the blue knifefish (Labracoglossa nitida), which is classified under the subfamily Scorpidinae and is part of the sea chub family, Kyphosidae.