Quote:
Originally Posted by sphelps
I believe 3 feet is the recommended minimum to prevent all the water from freezing solid. However I think most stick to 2 feet because anything deeper qualifies as a pool and would require a railing by code. Plus it's safer for kids and such if you keep it 2 feet or less. You prevent it from freezing with a deicer or something along those lines. As for other fish, no idea but I've only really seen people winter koi outside, met others with a large variety of other species but they bring them indoors for the winter.
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This is a sure way to have a frozen pond. If you put something in 2 feet deep you will have fish pops come spring unless you put a green house over the top or multiple trough heaters. When it dips down to the -30s the trough heaters have a hard time keeping large bodies of water open. They aren't designed for it, most all heaters are not designed for it. The other issue you run into is a sudden melt will cause your fish to escape, you laugh but there was a fellow in Taber that I had to help herd his koi back into the pond after a sudden melt left 6 inches of water in his yard. His koi decided to go walk about.
When we put our pond in it was mushroom shape. The crown was 4 feet deep and the stem dropped to 5 with a 30 inch deep shelf around the outside. We would then sink a brute container for the Koi to winter in. Add a trough heater and either have a fountain pump boiling the water or an airstone. Had great success.
As for fish other than goldfish and koi, we kept those little pink minnows. They would spawn freely and were great for controlling mosquito larvae. Other than that I cannot think of any other cold tolerant fish you could add that have been bred for pond display like koi. I am sure you could add some sunfish or pumpkin seed but I think they would cause issue for the koi. Why add $2 fish that will harass your $1000 koi.
You should consider talking to your neighbors as well. Your neighborhood needs to be aware of the pond and how spraying herbicides and pesticides can kill your pond. Also be aware of cats, raccoons, herons, pelicans, all these can grab fish right out of the pond and that's NEVER fun.