Some jerks have introduced non-native spiny rayed fish: small and largemouth bass, black crappies, pumpkinseed sunfish, and yellow perch to lakes here in B.C. and have ruined the stocks of kokanee, rainbow and brook trout. The damage may be irreversible as the gov't no longer has the capability to rehab lakes using pesticides. Do others have this kind of problem in their neck of the woods?