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.
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.S./Canada Pacific Salmon Treaty.
You ever seen a fish with real sharp teeth, fins, and gill covers
do a pirouette in a net?
Sea robins have large bony heads with spines along the gill covers
that provide protection from predators.
Knotless nets - a legal requirement - should be used at all times and salmon should never be dragged over gravel and rocks, or held by the tail or gill covers