that query is deeper then we think. every water system is different. great lakes fisherys are shared between commercial netters and sports fishing. folks state i wont eat those fish. the same claimints will go to zehrs,sobeys or any other seafood section. there buying the same fish.. as for overharvest that becomes regional to population and waterways.. did you know commercial fisherys are allowed 99.94 per-cent of walleye and yellow perch quots. sportsfishing is allowed 0.06 percent. sportsfishing has never achieved their quotas according to census.. smaller waterbodies are at risk situations.. maybe getting involved in active sportsman groups your words can be heard.