Possibly silly question for those advocating bucket stocking from trapping locals?

KS has 11 or 12 species of crayfish. Any possibility of screwing up a pond via trapping or seining out of a local creek? My assumption has always been that anything in a local creek has been introduced into area ponds at some point through natural means, so it wouldn't matter if you transplanted... but I'm also very careful about introducing species and paranoid about messing up what I've got.