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How do freshwater angelfish and discus fish feed their young?

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Bluefin tuna swimming underwater in a group, with silvery bodies and streamlined shapes, near Japan. — perciform Bluefin tuna (*Thunnus thynnus orientalis*) in the waters near Japan.

Freshwater angelfish and discus fish, both members of the cichlid family within the order Perciformes, provide nourishment to their young by secreting a mucuslike substance onto their skin. The young fish feed directly on this secretion produced by the adults. In the case of discus fish, both parents are typically involved in this process, often taking turns nursing the offspring.12