Relations Between Exploitation, Yield, and Community Structure in Polish Pikeperch (Stizostedion lucioperca) Lakes, 1966–71

Publisher Website
Google Scholar
Abstract
A review of official fishery records maintained on 43 Polish pikeperch (Stizostedion lucioperca) lakes during 1966–71 showed that yield was dependent on exploitation intensity and community structure. Community structure was studied on the basis of three groups of fish: predatory, undesirable, and valuable nonpredatory. The percent of predatory fish was used as an index of community structure. An increase of 1 unit of exploitation intensity increased yield by 0.42–0.50 kg/ha and a 1% increase in predatory fish decreased yield by 0.45–0.49 kg/ha. Undesirable fish predominated in lakes with high yields and predatory fish predominated in lakes with low yields. The largest catches of predatory fish species occurred when their percentage in the total catch reached 25. A more effective regulation of predatory and nonpredatory fish populations may be achieved through controlled exploitation. Key words: Percidae, European pikeperch, Poland, community dynamics, methodology, predators, exploitation, yield

This publication has 0 references indexed in Scilit: