"Köi-Lö" $##$$@$##$$.#$$ wrote in message
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2 to 3' deep may be too shallow in your climate. If the fish freeze they
will die. Or if so much water freezes they have too small an area of
unfrozen water, they will suffocate. Your pond seems kind of small for
koi. Koi can reach 3' in length. They are not small fish. Pond goldfish
can reach lengths of 1' or more.

As usual, you have no idea what you're talking about, and as usual, you give
newbies bad advice.
6 gf and 1 koi in a pond that's at least 7ft long, that's nothing, even if
they're full grown. The original poster didn't give us enough information to
accurately guestimate the pond's volume. But if it's 7ft long, we can assume
about 4-5ft wide. 7x4x3 = 84cuft or about 630 gallons.

The faq suggests 20 gal per gf, and 100 gal per koi, so
6 gf * 20 gal + 1 koi * 100 gal = 220 gal.

The original poster is well within the pond limits. You should have at least
plagiarized someone else's advice from last year, if you had, you might have
suggested a bubbler or a de-icer to keep a gas exchange hole open over
winter.

Original poster, check out these items as an example.
http://www.drsfostersmith.com/produc...N=62728+113821