What is "mucophagy"

Mucophagy (literally "mucus feeding") is feeding on mucus of fishes or invertebrates. It may also refer to consumption of mucus or dried mucus in primates.

There are mucophagous parasites, such as some sea lice that attach themselves to gill segments of fish.

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.