Mine are (I still have them) two 5 or 6" rubber koi and a few rubber
goldfish (which I seem to have lost).

Mine aren't rubber, but hard plastic.

I found them in a store down in
Atlanta when visiting my cousin. The birds smartened up pretty fast and
ignored them. There was no way in hell I would have netted these ponds if
something actually worked to keep the herons, kingfishers, large snakes and
bullfrogs and snapping turtles out of them. Nets are a real PIA but the only
way to have fish here.

Well, we've always said your area is unique, not the norm, imo. ~ jan
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Zone 7a, SE Washington State
Ponds: www.jjspond.us