|BROWN BULL NOSED CATFISH
Catfish are an introduced pest here in New Zealand. Originally from North America, the brown, bullheaded catfish, is confined to Lake Taupo where it was introduced as a game fish.
Another type of carp introduced to control weeds in our waterways is the grass carp. Because of their very specific spawning needs grass carp generally can't breed in the wild and so are still released regularly here.
Koi Carp are an ornamental strain of the common carp found throughout Europe and Asia. They were first released "accidentally" here in the 60's and since then they have gained a strong foothold in New Zealand fresh-waterways. They're classified as a noxious pest so kill 'em all.