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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 ?
One of the new products Gills has invested in is a state-of-the-art Florigo frying range at a cost of approximately PS50,000.
Detective Inspector Steve Cockwell, of Dyfed-Powys Police, said after the hearing: "The victims in this case were clearly weak and exposed at a very difficult time in their lives and went to the Gills looking for support not exploitation.
The Gills, of Cwmduad, Carmarthenshire, who were arrested last May, had charged their patients.
Any guest who has booked a Royal Caribbean International, Celebrity Cruises or Azamara Club Cruises holiday with Gills Cruise Centre can call a dedicated customer services number on 01932 834 345 or gills@rccl.
London, January 14 (ANI): Biologists appear to be one step closer in solving the mystery behind the evolution of fish gills after researchers observed that regulating chemicals in their bodies may be a probable explanation.
HUMANS still have a kind of gills, a legacy from our sea-dwelling ancestors, experts believe.
It gets rid of the water by pushing it over its gills and out of its body.
The researchers compared DNA extracted from the gills of English sole in the Duwamish River (which flows into the sound through a heavily industrialized area in south Seattle) to DNA taken from fish in the relatively clean Quartermaster Harbor.
There are a lot more Michael Gills than Arab sheiks.
The gills themselves became lungs, and the hyomandibula was transformed into an auditory ossicle: the stapes.
Fish breathe with gills (slits on both sides of a fish's head hidden behind a gill cover).
He and a friend picked the two Mr Gills out at a police identity parade and claimed they were the attackers.