Plural of graysby; plural form of a type of small grouper fish with gray coloring found in tropical and subtropical waters.
Possibly related to 'gray' and dialectal or regional fish naming conventions. The singular 'graysby' appears in ichthyological texts describing Caribbean reef fish.
Fish names are wonderfully literal—the graysby is literally a small gray fish, but once marine biologists named it, the common name stuck alongside the formal Latin name 'Cephalopholis cruentata'!
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