Fish Hatchery Management - fisheries & aquaculture

500 r'tsH HA'rcIIIrRy N,TANACEMEN r'Urea One of the compounds in which nitrogen is excreted from fish inthe urine. Most nitrogen is eliminated as ammonia through the gills.IJremia The condition caused by faulty renal function and resultins inexcessive nitrogenous compounds in the blood.Urinary Bladder The bladder attached caudally to the kidneys; thekidneys drain into it.Urogenital Pore External outlet for the urinary and genital ducts.VaccineA preparation of nonvirulent disease organisms (dead or alive)that retains the capacity to stimulate production of antibodies againstit. See Antigen.Vector A living organism that carries an infectious agent from aninfected individual to another, directly or indirectly.Vein A tubular vessel that carries blood to the heart.Vent The external posterior opening of the alimentary canal; the anus.Ventral Fins Pelvic fins.VHS See Yiral Hemorrhagic Septicemia.Viable Alive.Vibriosis An infectious disease caused by the bacterium Vibrio anguillarium.Synonyms: pike pest; eel pest; red sore.Viral Hemorrhagic Septicemia (VHS) A severe disease of troutcaused by a virus of the Rhabdovirus group. Synonyms: egtveddisease; infectious kidney swelling and liver degeneration (f NUI-) ;trout pest.Viremia The presence of virus in the blood stream.Virulence The relative capacity of a pathogen to produce disease.Vitamin An organic compound occurring in minute amounts in foodsand essential for numerous metabolic reactions.Vitarnin D A radiated form of ergosterol that has not been provedessential for fish.Vitamin K An essential, fat-soluble vitamin necessary for formation ofprothrombin; deficiency causes reduced blood clotting.Vitamin Premix A mixture of crystaline vitamins or concentrates usedto fortify a formulated feed.Viviparous Bringing forth living young; the mother contributes foodtoward the development of the embryos.Vomer Bone of the anterior part of the roof of the mouth, commonly triangularand often with teeth.Von Bayer Trough A l2-inch V-shaped trough used to count eggs.'WarmwaterSpecies Generally, fish that spawn at temperatures above60'F. The chief cultured warmwater species are basses, sunfish, catfish,and minnows. ,Sea Coldwater Species; Coolwater Species.