1. ANDERSSON, G., BERGGREN, H., CRONBERG, G. and C. GELIN, 1978. Effects of planktivorous and benthivorous fish on organism and water chemistry in eutrophic lakes. Hydrobiologia, 59: 9–15.
2. BARTHELMES, D. and H. WALDOW, 1978. Zusammenfassende fischereiliche Wertung der beobachteten biologischen Veränderugenn in Groszen Müggelsee. Z. Binnenfisch. DDR, 25: 209–214.
3. BIRO, P. and L. VOROS, 1988. Relationship between the yield of bream,Abramis brama L., chlorophyll-a concentration and shore length: water area ratio in Lake Balaton, Hungary, Aquaculture and Fisheries Management, 19: 53–61.
4. BUNGENBERG DE JONG, C.M., 1968. Production of fish for stocking. In: Annual report 1-4-1968/31-3-1969, Organization for the Improvement of Inland Fisheries, OVB Utrecht, 124 pp. (In Dutch).
5. CHAPMAN, C.A. and W.C. MACKAY, 1984. Direct observations of habitat utilization by northern pike. Copeia 1984, 225–228.