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gill

(gĭl)
n.
Zoology The respiratory organ of most aquatic animals that obtain oxygen from water, consisting of a filamentous structure of vascular membranes across which dissolved gases are exchanged.

gilled adj.

gill

  1. the respiratory organ of aquatic animals. External gills, as in tadpoles, are produced by the embryonic ECTODERM; internal gills, as in fish, are developed from the pharynx and are thus endodermal (see ENDODERM). Gills are usually well supplied with blood vessels, and interchange of oxygen and carbon dioxide takes place across the extensive surface area (see COUNTERCURRENT EXCHANGE). Gills also occur in many invertebrates, for example, in insects such as the caddis fly larva and molluscs such as oysters. Occasionally, unusual structures act as gills, for example, the walls of the rectum in certain dragonfly nymphs, water being pumped in and out via the anus.
  2. the spore-carrying lamellae in basidiomycete fungi, located underneath the cap or ‘pileus’.

gill

external breathing apparatus of fish. Very susceptible to a wide range of diseases.
Enlarge picture
Gill system of fish. By permission from Aspinall V, O'Reilly M, Introduction toVeterinary Anatomy and Physiology, Butterworth Heinemann, 2004

gill disease
an infectious disease of aquarium and salmonid species of fish caused by Flavobacterium bronchiophila. Also in Crassostrea angulata caused by an iridovirus and in larval shrimp caused usually by a Leucothrix spp. bacterium. Chronic, proliferative inflammation causes the gill filaments to be swollen and may be clubbed or fused. Called also bacterial gill disease.
gill parasites
the following external parasites are commonly found on the gills, and elsewhere on the skin, in aquarium fish: Gyrodactylus elegans—a monogenetic fluke; Diplozoon barbi, D. paradoxum—monogenetic flukes; Ergasilus sieboldi—crustaceans. Freshly caught seahorses may carry the crustacean Argulus spp. Pond fish may carry the anchor worm Lernaea spp. These are all visible with the naked eye and can be removed manually.
References in periodicals archive ?
Gilles says: "I amnot cheap but I do quality and people don't mind paying for that.
If Gilles tells me he wants to work in a coaching capacity as well as play that is something I would put to the board.
Lombardo & Gilles Office Manager Tina Hamby added, "Before we had Worldox, one of our attorneys spent hours trying to find three documents he had created, and when he couldn't find them, he had to recreate them.
One thing that Gilles is particularly proud of is the interior.
While big arena clubs host world famous DJs in front of thousands of fans over the Bank Holiday, Gilles has chosen to appear in Kings Heath at the recently refurbished and newly owned Hare & Hounds which holds just 200 people.
Jackie: Gilles had been invited along to my birthday do with another French friend because of his good looks.
Gilles had been sketching cars since he was 5, but had designs on a career as a doctor.
Moll, who co-wrote ``Harry'' with Gilles Marchand, displays a droll, dark humor and an adroit facility for male characterization.
We learn that Pierre was a more conservative fashion photographer until he met painter Gilles through Gilles's boyfriend.
Hearts are the holders and Gilles Rousset (right) stayed at his post to guard the cup.
Gilles BOGAERT is appointed Deputy Managing Director in charge of Finance, replacing Emmanuel BABEAU who decided to leave the Group.
Gilles of DaimlerChrysler named one of America's most powerful players under 40 by Black Enterprise - The "Hot List" profiles bold, young innovators who are transforming the world of business, entertainment, media, sports, science and politics - Article to be featured in December issue of Black Enterprise