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This edited article about fish originally appeared in Look and Learn issue number 650 published on 29 June 1974.
The Fierasfer, or Carapus is a small, eel-like pearlfish which actually lives most of its life as a parasite inside the body of a sea cucumber. It feeds on some of the internal organs of its host, but does not kill the sea cucumber because it can re-grow the parts that are eaten. It comes out occasionally to catch a few shrimps and small crabs. It has been found that in the seas around the West Indies, one in every three sea cucumbers has a fish inside it.