While - attention - goldfish, koi and sunfish are well known
to be first class biotope killers..

Habitat killers, meaning they destroy their habitat or environment?
I'm not sure I understand that either, but it's an interesting idea.


I understand how koi dig and muddy the pond. I am not sure how
goldfish and sunfish doi that. Our goldies would multiply fast, as
would sunfish. How do thoase species destroy habitats?

Jim