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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 ?
Capitulo aparte merece el dilucidar la posible influencia de Antonin Artaud (1896-1948) en Gilles de Raiz.
Gilles says: "I amnot cheap but I do quality and people don't mind paying for that.
If the manager asked me about Gilles, I would tell him him to keep him past his loan date.
Por que Gilles de Rais, el Pancho Villa de Juana de Arco, el que amo la virginal pureza de aquella muchacha con el arrobo y la veneracion de un mistico frente a la Virgen, a la muerte de Juana se vuelca en una vida de depravacion, raptando ninos y ninas que viola y asesina?
Lombardo & Gilles purchased Worldox GX2 in December 2009 from Baker+Cadence Solutions (www.
The former Spice Girl, 42, accuses German au pair Gilles, 26, of having an affair with Belafonte and getting pregnant by him.
THE CANNES FILM FESTIVAL IS THE BEST FESTIVAL LARGELY DUE TO GILLES AND HIS ELEGANT STYLE.
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.
One of the hottest automotive designers to date, Gilles led the team that designed the Chrysler 300C.
1964 74m director, script and editor Gilles Groulx, producer Jacques Bobet, cinematographer Jean-Claude Labrecque, music John Coltrane and Antonio Vivaidi; with Barbara Ulrich, Claude Godbout, Manon Blain, Jean-Paul Bernier, Andre Blanc and Veronique Vilbert
Moll, who co-wrote ``Harry'' with Gilles Marchand, displays a droll, dark humor and an adroit facility for male characterization.