474 FISH HAICHF.RY MANAGEMENT 



Blue Slime Excessive mucus accumulation on fish, usually caused by 

 skin irritiation due to ectoparasites or malnutrition. 



Blue-Slime Disease A skin condition associated with a deficiency of 

 biotin in the diet. 



Blue Stone See Copper Sulfatte. 



Boil A localized infection of skin and subcutaneous tissue developing 

 into a solitary abscess that drains externally. 



Bouin's Fluid A mixture of 75 parts saturated picric acid, aqueous solu- 

 tion; 25 parts formalin (40'/(i formaldehyde); and 5 parts glacial acetic 

 acid. This is widely used for preserving biological material. 



Brackish Water A mixture of fresh and sea water; or water with total 

 salt concentrations between 0.05% and 3.0%. 



Branchiae (singular: Branchia) Gills, the respiratory organs of fishes. 



Branchiocranium The bony skeleton supporting the gill arches. 



Branchiomycosis A fungal infection of the gills caused by Branchiao- 

 myces sp. Synonyms: gill rot; European gill rot. 



Broodstock Adult fish retained for spawning. 



Buccal Cavity Mouth cavity. 



Buccal Incubation Incubation of eggs in the mouth; oral incubation. 



Buffer Chemical that, by taking up or giving up hydrogen ions, sustains 

 pH within a narrow range. 



Calcinosis The deposition of calcium salts in the tissues without detect- 

 able injury to the affected parts. 



Calcium Carbonate A relatively insoluble salt, CaCO^,, the primary 

 constituent of limestone and a common constituent of hard water. 



Calcium Cyanamide (Lime Nitrogen) CaCN;. Used as a pond disinfec- 

 tant. 



Calcium Oxide See Lime. 



Calorie The amount of heat required to raise the temperature of one 

 gram of water one degree centigrade. 



Carbohydrate Any of the various neutral compounds of carbon, hydro- 

 gen, and oxygen, such as sugars, starches, and celluloses, most of 

 which can be utilized as an energy source by animals. 



Carbon Dioxide A colorless, odorless gas, CO7, resulting from the oxi- 

 dation of carbon-containing substances; highly soluble in water. Toxic 

 to fish at high levels. Toxicity to fish increases at low levels of oxygen. 

 May be used as an anesthetic. 



Carbonate The C03^ ion, or any salt formed with it (such as calcium 

 carbonate, CaCO^). 



Carcinogen Any agent or substance that produces cancer or accelerates 

 the development of cancer. 



