Fish Hatchery Management - fisheries & aquaculture

GLOSSARY 489Mucking (Egg) The addition of an inert substance such as clay or starchto adhesive eggs to prevent them from sticking together during spawntaking. Most commonly used with esocid and walleye eggs.Mucus A viscid or slimy substance secreted by the mucous glands of fish.Mutation A sudden heritable variation in a sene or in a chromosomestruc ture.Mycology The study of fungi.Mycosis Any disease caused by an infectious fungus.Myomere An embryonic muscular segment that later becomes a sectionof the side muscle of a fish.Myotome Musclesegment.Myxobacteriosis A disease caused by any member of the Myxobacteriagroup of bacteria. ,See Peduncle Disease, Cold Water Disease, Fin RotDisease, Columnaris Disease.NaresNecropsyNecrosisThe openings of the nasal cavity.A medical examination of the body after death to ascertainthe cause of death. Synonym for humans: autopsy.NematodaDying of cells or tissues within the living body.A diverse phylum of roundworms, many of which are plantor animal parasites.Nephrocalcinosis A condition of renal insufficiency due to the precipitationof calcium phosphate (CufO*; in the tubules of the kidney.Observed frequently in fish.Niacin One of the water-soluble B-complex vitamins, essential formaintenance of the health of skin and other epithelial tissues in fishes.Nicotinic Acid Sre Niacin.NitrificationA method through which ammonia is biologically oxidizedto nitrite and then nitrate.Nitrite The NO2 ion.Nitrogen An odorless, gaseous element that makes up 78% of the earth'satmosphere and is a constituent of all living tissue. It is almost inert inits gaseous form.Nitrogenous Wastes Simple nitrogen compounds produced by themetabolism of proteins, such as urea and uric acid.Nonpathogenicdisease.Nostril Sae Nares.NutrientNutritionRefers to an organism that may infect but causes noA chemical used for growth and maintenance of.an organism.The sum of the processes in which an animal (or plant) takesin and utilizes food.Nutritional Gill Disease Gill hyperplasia caused by deficiency of Pantothenicacid in the diet.