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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 ?
Enjoy one of the world's greatest views - Windermere's eastern shores - from the comfort of your bed at Holbeck Ghyll or have a drink in the bar before settling in for a fantastic meal in the restaurant
The honeymoon may be truly over, but the accommodation at Holbeck Ghyll ensures privacy all round.
Holbeck Ghyll has so far managed this very well, the more modern cottages and suites in the grounds not clashing with the main house.
Cote Ghyll Mill was constructed by William Yeoman, of Pately Bridge, to produce flax, a strong fibre used in the manufacturing of industrial materials.
Nestled beneath Harrison Stickle, Pike of Stickle and Jaques Rake at the head of the Langdale Valley, and surrounded by six acres of gardens and pasture, the New Dungeon Ghyll Hotel is the perfect Lake District getaway.
Carl lends Debbie the money to buy Tug Ghyll, to spite Matthew, and Nicola tries to literally scare Donald to death.
The five-year-old was value for a lot more when coming home 26 lengths clear of Heron's Ghyll in a novice hurdle over two miles one and a half furlongs.
Detectives are keeping an open mind as to whether the firearms discharges in Dalton Fold Road in Rawthorpe on July 22, The Ghyll in Fixby on July 23 and New House Road on July 27 are linked to the incident in Holays, also on July 27, where a taxi driver received shotgun pellet injuries.
The real highlight of the week though for both Julie Phimister, parental engagement partner at Ashington High School, and I had to be seeing how the students helped each other during the day of ghyll scrambling.
The wonderful views across the Lake District and the Michelin-starred dining in the restaurant is a winning combination for Holbeck Ghyll country house hotel in Windermere.
TAKE advantage of a 40% off deal at Ghyll Cottage, a recently refurbished 17th century cottage in the heart of the Sussex countryside.