cleaner fish

Noun

 * 1)  Any of many unrelated fishes that provide a service to other fish species by removing dead skin and parasites.

Translations

 * Finnish: puhdistajakala
 * Japanese: 掃除魚
 * Lü: ᦔᦱᦃᦲᧄ
 * Russian: ры́ба-чи́стильщик