Pearl fish

pearlfish

[purl-fish]
noun, plural pearlfishes (especially collectively) pearlfish.
any of several small fishes of the family Carapidae, living within pearl oysters, sea cucumbers, starfishes, etc.

Origin:
1585–95; pearl1 + fish

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
pearlfish

noun
found living within the alimentary canals of e.g. sea cucumbers or between the shells of pearl oysters in or near shallow seagrass beds 
WordNet® 3.0, © 2006 by Princeton University.
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