Mucophages may serve as cleaners of other animals.
Another usage of this term is in reference to the feeding organ rich in mucous cells which pumps the water through, feeding particles get entrapped in mucus, and the latter proceeds into the esophagus.
See also 
- Pathogenesis of Wild and Farmed Seafish
- The epibranchial organ, its innervation and its probable functioning in Heterotis niloticus (Pisces, teleostei, osteoglossidae)