Its a simple closed circuit system. The blood flows through the fish body passing through the gills where the gills siphon out dissolved oxygen from the water. The oxygenated blood then flows through the fish expending the oxygen and picking up carbon dioxide and expelling it from the gills and picks up more oxygen.
The gill rakers on fish keep food particles from moving out from in between the gill arches. For filter feeding fish and some suspension feeding fish, the gill rakers function is to trap the food.
It is used to cover the gill on the fish.
a gill cover is used to cover the gill on the fish
the gill operculum covers and protects the gills.
gill is a part of a fish.
The flap of tissue that covers a bony fish gill is the bony operculum.
gill slits
A fish breathes through its gills.
Gill.
The black and white fish Named "Gill" from Disney/Pixar's Finding Nemo is a Moorish Idol. Though aquariums often state this fish as a Black and White Heniochas.
gill
To help them breath!