Sorry for my lack of knowledge, but asian carp were brought to the united states by both farmers and fisheries agencies. it's now illegal to own a grass carp that isn't triploid (sterile), which were introduced to control hydrilla. Zebra mussels were introduced by farmers to control blue-green algae, subsequently the government introduced the native predator of the zebra mussel into US waters, which are outcompeting indigenous species. The Erie canal introduced sea lamprey to the great lakes. Largemouth have been stocked all over the world. Flathead catfish, striped bass, channel catfish, blue catfish, pike, trout, collectively have done more damage than all asian carp combined. Fish and wildlife don't even protect the fish with the best genes. Have you ever heard of a place where there was a size maximum?