1. Anderson, D. 1974. A biological trickling filter system for water reuse in trout rearing. Investigational Report No. 322, Minn. Dep. of Nat. Res. 26 p.
2. Interactions of stocking density and water turnover on growth and food conversion of channel catfish reared in intensively stocked tanks;Andrews;Prog. Fish-Cult.,1971
3. AOAC (Association of Official Analytical Chemists). 1970. Methods of analysis of the Association of Analytical Chemists. Washington, D.C. 1015 p.
4. APHA (American Public Health Association), American Water Works Association, and Water Pollution Control Federation. 1975. Standard methods for the examination of water and wastewater, 14th ed. Am. Public Health Assoc.: New York. 1193 p.
5. Aquaculture, the farming and husbandry of freshwater and marine organisms;Bardach,1972