gill cover

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Related to gill covers: Opercle

gill cover

[′gil kəv·ər]
(vertebrate zoology)
The fold of skin providing external protection for the gill apparatus of most fishes; it may be stiffened by bony plates and covered with scales.
References in periodicals archive ?
The present results appear to indicate, for acute poisoning, a detoxification-dependent effect from methylmercury only for the behavior of opening the gill covers.
These appetitive components include saturation of body coloration, erection of the opercles, or gill cover, orientation and movement characteristics (Simpson, 1968).
The research, which involves marking chinook salmon by punching small holes in their gill covers - as well as inserting radio transmitters in a few fish - is being conducted to meet Oregon's obligation under the U.
You ever seen a fish with real sharp teeth, fins, and gill covers do a pirouette in a net?
The scales are ejected from under the gill covers of the bass.