The fact of the matter is that some idiot released a fish that didnt belong into waters it shouldnt be in. The next fact is that this newly introduced species is causing lots of problems in those waters, just like the Asian carp (?) that are jumping out of the Mississippi river everytime a boat goes by, and sometimes even knocking people off boats, and causing some deaths, and damage to boats. While I think a responsible owner should be able to keep them, how do we determine the good from the bad owners? We cant, so when something like this happens, it looks bad on everybody, and causes problems for everybody. But if stupidity leading to ecological damage can be prevented by banning a certain species or even genus, it's not always a bad thing...