All species of the genus Carapus have obligatory commensal relationships with sea cucumbers (Holothuria), starfishes (Asteri-oidea), or sea squirts (Ascidiacea). Many species exhibit host specificity. Carapus bermudensis has been collected in the body cavity of nine holothurian species in the genera Actinopyga, Isostichopus, Thone, Astichopus, Holothuria, and Theelothuria. These host species generally reside in shallow waters, to about 98.4 ft (30 m) on sandy bottoms or grass beds in tropical and subtropical lagoons near reefs. In one study in the Bahamas, pearl-fishes were found in relatively few restricted areas, although more than 1,000 sea cucumbers were surveyed.
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