I dont know how you guys go with controversial topics and if the mods think this is likely to get out of hand in any way, shape or form then just pull it down... or maybe there is a logical answer.
Carp are introduced, few people like them, the govt considers them a pest, the majority fishermen insist that killing any caught is the right thing to do and certainly fine are handed out if you let one go where it wasnt caught. they dig up the banks causing erosion and dig up aquatic plants causing siltation of water systems. native species move on or die off due to this silt or starvation
trout are introduced, everyone loves them, the govt spends millions of dollars putting more in the water systems, they are protected during their spawning season, fishermen worship them (just about) and will return them to the water relatively unharmed... yet they are preditors that will eat any native fish, crustacean or insect small enough to fit in its mouth. studies (mostly ignored) about native galaxias populations show a drop with the introduction of trout.
so it is obvious that both species have negative impacts on the ecosystems they are introduced into, but why is the carp a pest and not the trout? surely its cant all be about money?
debate here