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acre-feet Adult crappie age-0 crappie angler harvest anglers targeting crappie average Back-calculated lengths beneﬁt biomass Clinton Lake completed trips conservation pool cove sampling cove station crappie population crappie spawning crappies at Rathbun creel survey decreased density of young embayments exploitation at Rathbun exploitation rate factors that inﬂuence ﬁrst ﬁsh ﬁshery ﬁshing ﬂood control reservoirs ﬂuctuations growth harvest at Rathbun harvest of crappie Iowa June Lake ranged largemouth bass larval crappie abundance Length-frequency distribution LENGTHINCHES PERCENTFREQ levels of exploitation limit restriction minimum length limit Mitzner number per acre occurred Otoliths plankton pool stations Predicted ranged rate of exploitation Rathbun Lake crappie reduced Regression relationship restrictions and subjected rotenone Secchi disk readings signiﬁcant spawning season sportﬁsh harvest sportﬁshery subjected to three substrate ﬁrmness Table tags three harvest restrictions total harvest townet turbidity Vasey W,-values walleye water level water storage water temperature white bass white crappies wind values year-class young crappies