Fish Hatchery Management - fisheries & aquaculture

GLOSSARY 477Control (Experimental) Similar test specimens subjected to the sameconditions as the experimental specimens except for the treatmentvariable under study.Control Fish A group of animals given essentially identical treatment tothat of the test grouP, except for the experimental variable.Coolwater Species Generally, fish that sPawn in temperatures between40' and 60'F. The main cultured coolwater species are northern pike,muskellunge, walleye, sauger, and yellow perch. Saa Coldwater Species;Warmwater Species.Copper Sulfate (Blue Stone) Blue stone is copper sulfate pentahydrate(CuSOa'5H20). Effective in the prevention and control of externalCorneaprotozoan parasites, fungal infections, and external bacterial diseases.Highly toxic to fish.Outer covering of the eye.Corynebacterial Kidney Disease Sae Bacterial Kidney Disease.Costiasis An infection of the skin, fins, and gills by flagellated protozoansof the genus Casfia.Cranium The part of the skull enclosing the brain.Cyanocobalamin (Vitamin B12) One of the B-complex vitamins that isinvolved with folic acid in blood-cell production in fish. This vitaminenhances growth in many animals.Cyst, Host A connective tissue capsule, liquid or semi-solid, producedaround a parasite by the host.Cyst, of Parasite Origin A noncellular capsule secreted by a parasite.Cyst, Protozoa A resistant resting or reproductive stage of protozoa.Cytoplasm The contents of a cell, exclusive of the nucleus.Daily Temperature Unit (DTU) Equal to one degree Fahrenheit abovefreezing (32'F) for a 24-hour period.Dechlorination Removal of the residual hypochlorite or chloraminefrom water to allow its use in fish culture. Charcoal is used frequentlybecause it removes much of the hypochlorite and fluoride. Charcoal isinadequate for removing chloramine.Dee's Disease ,Saa Bacterial Kidney Disease.Deficiency A shortage of a substance necessary for health.Deficiency Disease A disease resulting from the lack of one or moreessential constituents of the diet.Denitrification A biochemical reaction in which nitrate (NO, ) lsreduced to NO2, N2O, and nitrogen gas.Density Index The relationship of fish size to the water volume of arearing unit; calculated by the formula:Density Index:(weight of fish) + (fish length X volume of rearing unit).