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 ?
Control your fish by gripping it under the soft gill covers where you can get a solid handle opposite the lure without actually touching/harming the gills.
The main identification for the allis is five black spots down either flank and the twaite has two black smudges, one either side on the shoulders behind the gill covers.
The mud would come to life again, and Harada would begin his fishing, casting and snagging the mudskippers through their gill covers in one smooth motion that did not alarm the creatures enough to send them headlong into their hidey-holes.