I would say it is possible, but I have no experience in south america! First maybe try to find out what is legal?
What type of fish do you have down there?
Here where I live there nothing, that's why I would like a pond with fish I could eat, not only because I'll certainly enjoy spending time taking care and feeding them but also because I remember my childhood when I spent the summers at the beach with my grandfather catching fresh hake, catfish, atlantic silverside, shrimp and such right from the shore or in the docks, and it's being a long time since I ate a good fresh fish.
The only thing I can buy here is some frozen hake. I know that around 50-100km from here there are river where you can catch tarariras (I think its called wolf fish in english), carps, silversides (the big ones), a few different kinds of trouts (rainbow, brook, perch, etc). dorados and shads.
Welcome Wok
It will be interesting to have someone with a pond in Argentina. By stagnant do you mean just rainwater filled?
Does the wind blow a lot? Koi can take cold conditions that some fish might not survive.
Guess you have to research what types of fish are available in your area. Please keep us updated with your progress
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From what I know these friends of the family who have a small pond with koi filled it with "tap water" which kinda comes straight from the mountain here, I've only seen it twice (I will be there again maybe in the next month) I don't think they do too much maintenance because the water was really dark and green and they had no filtering/aeration system at sight, just a hole in the ground with water and fish.
