I am a little hesitant to follow up your post because I don't know a great
deal about these fish, but I do know a little. The freshwater stingrays I am
familiar with come from the Amazon River basin. The specimens I have seen
(about five, all in aquariums ranging in size from about 100 gallons at a pet
shop to something in the thousands at the New England Aquarium) were never
bigger than about 10 inches across. Additionally, I've seen a photograph of
one in National Geographic; in this case, it had been caught for dinner by a
native of the area -- again, it was perhaps 10 inches across. I don't know
that they don't get bigger; these are just the specimens I've seen.
Because they come from a tropical environment, I tend to doubt they would do
well in an outdoor pond anywhere in the continental United States, but I am
really talking off the top of my head here. I think it might not be such a
good idea to put them in a pond unless access was carefully controlled;
they're dangerous to step on. Like all rays, though, they're wonderfully
graceful and rather beautiful in their way.
As for where they can be found for sale, check a tropical fish hobbyist
magazine. I saw a small one in a pet shop in Cambridge a number of years ago,
and I think the price was $400 -- not all that much for so unusual a fish.
Dunno how you get em in the States, but they are fairly easy to come by here.
Thet will certainly survive anything Koi will, I'm assuming you have 3'-4' feet
of water in this pond, if you don't you are probably going to loose the Koi!
They grow to about 4'-8' depending on exactly what variety you obtain, become
quite tame, are uniformly a sort of graphite colour.
I missed the Stingray reference, I only know of tropical freshwater stingrays,
unless you know better?
ByE!
Hmmm, think I have a few articles somewhere... When (if) I can find 'em, I'll
OCR scan them and post. OK?
ByE!
I've seen Sturgeon at my local Koi supplier, in S.E. England. They
certainly do get tame, the ones in their tanks could be picked out
of the water, simply by holding them just behind the head.
They're pretty weird looking, rather primeval.
I wonder if you could get caviar off/out of them........?
Steve R