Fish Hatchery Management - fisheries & aquaculture

482 FISH HATCHERY MANAGEMENTFungusDiseaseSaaSaprolegniasis'FuruncleAlocalizedinfectionofskinorsubcutaneoustissuewhichdevelops a solitary abscess that may or may not drain externally'Furunculosis A bacterial disease caused by Aeromonas salmonicida artdcharacterized by the aPPearance of furuncles'Gall Bladder The body vessel containing bile'Gametes Sexual cells: eggs and sperm'Gape The oPening of the mouth'Gas Bladder See Air Bladder'Gas Bubble Disease Gas embolism in various organs and cavities of thefish, caused by supersaturation of gas (mainly nitrogen) in the blood.Gastric Relating to the stomach'Gastritis Inflammation of the stomach'Gastroenteritis Inflammation of the mucosa of the stomach and intes'tines.Gene The unit of inheritance. Genes are located at fixed loci in chromosomesandcanexistinaseriesofalternativeformscalledalleles.GeneticDominantCharacterdonatedbyoneParentthatmasksintheprogeny the recessive character derived from the other parent'GeneticsGenitalThe science of heredity and variation'Pertaining to the reproductive organs'GenusAunitofscientificclassificationthatincludesoneorseveralclosely related species. The scientific name for each organism includesdesignations for genus and species'Geograit ic Distribirtion The geographic areas in which a condition ororganism is known to occur'Gerrniiral Disc The disc-like area of an egg yolk on which cell segmentationfirst aPPears.Gill Arch The U-shaped cartilage that supports the gill filaments'Gill Clefts (Citt Stlts) Spaces between the gills connecting the pharyngealcavity with the gill chamber'GillCoverTheflap-likecoverofthegillandgillchamber;theoperculum.Gill DiseaseGill Filamentsee Bacterial Gill Disease; Environmental Gill Disease'The slender, delicate, fringe-like structure composing thegill.Gill Lamellae The subdivisions of a gill filament where most gas andsomemineralexchangesoccurbetweenbloodandtheoutsidewater.Gill Openings The external openings of the gill chambers' defined bythe oPerculum.Gill Rakers A series of bony appendages, variously arranged along theanterior and often the posterior edges of the gill arches'