Gill

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Related to gill cover: lateral line, pelvic fin, swim bladder

GILL. A measure of capacity, equal to one-fourth of a pint. Vide Measure.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
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On the other hand, the gill slits are a characteristic feature to cartilaginous fish such as sharks and rays, in which they are characterized by the absence of a single outer gill cover and replace by individual openings to gills (Gerhart et al., 2005).
Morphological Studies on the Gills of Puffer Fish (Lagocephalus sceleratus, Gmelin, 1789)/Estudios Morfologicos en Branquias del Pez Globo (Lagocephalus sceleratus, Gmelin, 1789)
A vivid black beauty mark with a reddish, crescent border flares out from the trailing edge of its gill cover.
Catching kivvers puts kids on the hook
One notable marking is the blue or black "ear," which is actually an extension of the gill cover. On the gill rakers (tooth-like structures on the inner edge of the gill arches), bluegill have a bright blue edging.
Gettin' fishy: five species of freshwater fish for the rural American
You usually don't need to pinch your thumb on the outside of the gill cover. Walleyes rarely thrash wildly when held this way.
Selective walleye harvest: using our Walleye resources wisely: Walleyes are fine and nutritious table fare, and we remain strongly in favor of eating them, but we also remain strongly opposed to killing every walleye caught. our precious fish resources need to be used so anglers who want to keep some fish can do so, and those who want high-quality fishing can have it
These appetitive components include saturation of body coloration, erection of the opercles, or gill cover, orientation and movement characteristics (Simpson, 1968).
Effects of trophic poisoning with methylmercury on the appetitive elements of the agonistic sequence in fighting-fish (Betta Splendens)
However, the fossils don't include an operculum, or gill cover, that would have protected the delicate structures and moved oxygenated water across them.
Amphibious ancestors: vertebrates' transition to dry land took some fancy footwork

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