gills

Second, a good technique for gills is to cast the fly and and have it sit still for 10 seconds or at least until the rings caused by the fly landing on the water disappear.

Fly Fishing for Panfish and Bass 2009

Oxygenated blood from the gills is fed to the muscles via large subsurface coetaneous arteries.

Dr. Reese Halter: Protecting Great White Sharks Dr. Reese Halter 2010

Oxygenated blood from the gills is fed to the muscles via large subsurface coetaneous arteries.

Dr. Reese Halter: Protecting Great White Sharks Dr. Reese Halter 2010

Second, a good technique for gills is to cast the fly and and have it sit still for 10 seconds or at least until the rings caused by the fly landing on the water disappear.

Fly Fishing for Panfish and Bass 2009

In this circumstance of their possessing a one-celled heart, and colder and darker blood, they approach to the state of fish; which thus appear not to acquire so much oxygen by their gills from the water as terrestrial animals do by their lungs from the atmosphere; whence it may be concluded that the gills of fish do not decompose the water which passes through them, and which contains so much more oxygen than the air, but that they only procure a small quantity of oxygen from the air which is diffused in the water; which also is further confirmed by an experiment with the air-pump, as fish soon die when put in a glass of water into the exhausted receiver, which they would not do if their gills had power to decompose the water and obtain the oxygen from it.

Note V 1803

Just be careful to avoid the gills, which isn't a problem if the gaff is centered right at the front of the mouth.

The Fine Art of Gaffing 1999

-- The fungi called agarici are those which have gills, that is, little plates which look like knife blades on the under surface of the top of the mushroom, radiating outward from the stem like the spokes of a wheel.

The Home Medical Library, Volume V (of VI) Kenelm Winslow

When taken out of the water the fish really dies of suffocation, for the water that enters its throat and flows out through the gills is the air that keeps it alive.

How Sammy Went to Coral-Land Emily Paret Atwater

The little tufts projecting from the oral side in the Sea-Urchins, described as gills, are another form of the same kind of appendage.

The Atlantic Monthly, Volume 10, No. 57, July, 1862 Various

These are known as the gills, or lamellæ, and they usually radiate from a common point, as from or near the stem, when the stem is present; or from the point of attachment of the pileus when the stem is absent.

Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. George Francis Atkinson 1886