Fish Hatchery Management - fisheries & aquaculture

GLOSSARY 487Length May refer to the total length, fork length, or standard length(see under each item).Lesion Any visible alteration in the normal structure of organs, tissues,or cells.Leucocyte A white blood corpuscle.Lime (Calclum Oxide, Quicklime, Burnt Lime)CaO; used as a disinfectantfor fish-holdine facilities. Produces heat and extreme alkalineconditions.Line Breeding Mating individuals so that their descendants will bekept closely related to an ancestor that is regarded as unusually desirable.Linolenic Acid An l8-carbon fatty acid with two double bonds. CertainLipidmembers of the series are essential for health, growth, and survival ofsome, if not most, fishes.Any of a group of organic compounds consisting of the fats andother substances of similar properties. They are insoluble in water, butsoluble in fat solvents and alcohol.Long Bath A type of bath frequently used in ponds. Low concentrationsof chemical are applied and allowed to disperse by natural processes.Lymphocystis Disease A virus disease of the skin and fins affectingmany freshwater and marine fishes of the world. The disease is causedby the lymphocystis virus of the Iridovirus group.Malignant Progressive growth of certain tumors that may spread to distantsites or invade surrounding tissue and kill the host.MalnutritionMandibleMASMass SelectionFaulty or inadequate nutrition.Lower jaw.Srr Motile Aeromonas Septicemia.Selection of individuals from a general population foruse as parents in the next generation.Mating System Any of a number of schemes by which individuals areassorted in pairs leading to sexual reproduction.Maxilla or Maxillary The hindmost bone of the upper jaw.MeanThe arithmetic average of a series of observations.Mechanical Damage Extensive connective tisue proliferation, leadingMedianto impaired growth and reproductive processes, caused by parasitesmigrating through tissue.values.MelanophoreA value in a series halfway between the highest and lowestA black pigment cell; large numbers of these give fish adark color.Menadione A fat-soluble vitamin: a form of vitamin K.