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abundance adult age-groups alewife annual average Balaton basin Bay of Quinte Biol biomass Board Canada catch changes correlation decline decreased density depth distribution dore jaune ecology effects eggs Esox estimates Eurasian perch eutrophication exploitation factors feeding females fingerlings fish populations Forney freshwater gill nets growth rate habitat harvest Hokanson increased intensity kg/ha Lake Balaton Lake Huron Lake Oahe larvae length maximum Michigan Ministry of Natural Minnesota mortality North northern pike Oneida Lake Ontario Perca fluviatilis perch Perca fluviatilis percids period pikeperch piscivorous predation prey production range recruitment Regier relation reproduction Reservoir River roach ruffe samples sauger season smallmouth bass smelt spawning species Stizostedion lucioperca Stizostedion vitreum vitreum sucker summer survival Table thermal tion Trans trout walleye walleye population walleye Stizostedion vitreum water temperature weight western Lake Erie year-class strength yellow perch yellow perch Perca yield zooplankton