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gill cover

   Also found in: Dictionary/thesaurus 0.01 sec.
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.


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To breathe, most--but not all--fish pump water through their mouth, over their gills and out their gill cover, called the operculum.
If you gently put your fingers inside a gill cover until you reach the gristly jaw bone where there are no teeth, the pike will open its mouth wide so you can take the hooks out with artery forceps.
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.
 
 
 
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