1. Anon (1989). Statistical Bulletin, Fisheries Department. Ministry of Tourism and Wildlife, Nairobi, Kenya.
2. AOAC. Association of Official Analytical Chemists. (1984).Official Methods of Analysis. American Organisation of Agricultural Chemists, Arlington, Virginia. p 153–154.
3. Cole, D. J. A. (1978).Recent Advances in Animal Nutrition. (Eds W. Haresign and D. Lewis). Butterworths London. p 66.
4. Hughes, N. F. (1986).Journal of Fish Biology,29, 541–548.
5. Laksevela, B. (1961).Journal of Agricultural Science (Cambridge),56, 307–315.