Fish Hatchery Management - fisheries & aquaculture

GLOSSARY 499Total Solids All of the solids in the water, including dissolved,Toxicitysuspended, and settleable components.A relative measure of the ability of a chemical to be toxic.Usually refers to the ability of a substance to kill or cause an adverseeffect. High toxicity means that small amounts are capable of causingToxindeath or ill health.Toxicology The study of the interactions between organisms and a toxicant.A particular class of poisons, usually albuminous proteins of highmolecular weight produced by animals or plants, to which the bodymay respond by the production of antitoxins.Transmissionanother.The transfer of a disease aqent from one individual toTransmission, Horizontal Any transfer of a disease agent between individualsexcept for the special case of parent-to-progeny transfer viareproduc tive processes.Transmission, Vertical The parent-to-progeny transfer of diseaseagents via eggs or sperm.Trauma An injury caused by a mechanical or physical agent.TrematodaTumorThe flukes. Subclass Monogenea: ectoparasitic in general,one host; subclass Digenea: endoparasitic in general, two hosts ormore.An abnormal mass of tissue, the growth of which exceeds and isuncoordinated with that of the tissues and persists in the same excessivemanner after the disappearance of the stimuli that evoked thechange.TurbidityPresence of suspended or colloidal matter or planktonicorganisms that reduces light penetration of water.Turbulencestirring forces.Agitation of liquids by currents, jetting actions, winds, orUbiquitousUDNUlcerExisting everywhere at the same time.Saa Ulcerative Dermal Necrosis.A break in the skin or mucous membrane with loss of surface tissue;disintegration and necrosis of epithelial tissue.Ulcer Disease An infectious disease of eastern brook trout caused bvthe bacterium Hemophilus piscium.Ulcerative Dermal Necrosis (UOt{) A disease of unknown etiologyoccurring in older fishes, usually during spawning, and primarilyinvolving salmonids.United States Pharmacopeia (USp) An authoritative treatise ondrugs, products used in medicine, formulas for mixtures, and chemicaltests used for identity and purity of the above.