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found living within the alimentary canals of e.g. sea cucumbers or between the shells of pearl oysters in or near shallow seagrass beds

1. [so called from its inhabiting the mantle cavity of the pearl oyster] : a fish of the family Carapidae and especially of the genus Carapus

2. : pearlsides

3. : any of various cyprinoid and clupeoid fishes having scales which yield pearl essence

/perrl"fish'/, n., pl. pearlfishes, (esp. collectively) pearlfish.

any of several small fishes of the family Carapidae, living within pearl oysters, sea cucumbers, starfishes, etc.

[1585-95; PEARL¹ + FISH]