Bluestreak cleaner wrasse

These fish are known for being cleaner fish; they feed by picking food off of other fish, such as parasites on their bodies or leftover food in their mouths. This role of theirs means that they can stay in close proximity to large fish without being attacked.

Scientific Name
Labroides dimidiatus
Order: Perciformes, Family: Labridae
South of Chiba Prefecture, Indian Ocean, Pacific Ocean