How does barging fish wipe out wild fish, it would be no different then if no hatchery fish existed at all. Predators would still feast on the wild fish, we have created so many traps for easy predation With dams, it is a joke. Just like any predator the more food avail the larger the predator base. You can increase plants all day long and the more you plant the larger the predator base will become. I can go out and catch a Springer or two, but 50 walleye in a day. Maybe our priority is predators. Not the whales