Not when its a trout river and the fishing clubs are putting time and money for years into bringing up the salmon levels.
i can understand the need for control and its silly to add pike to a venue unless it needs some, but a few predators in your river will keep the sick and injured fish down, and keep your stock more healthy, every ecosystem needs predators. its very foolish to remove them all. it works in cycles too, if the predators get too numerous, stocks drop and then they eat each other (more than usual anyway)predator numbers go down, stocks rise again (of prey fish) and predators