"Tom L. La Bron" wrote:

Goldfish, KOI, catfish, bass, etc are not
coldwater fish; they are designated as warmwater
fish. Just because they can survive under ice
doesn't make them coldwater fish. Examples of
coldwater fish are certain varieties of trout,
salmon, etc. These fish live, frolic and breed in
water temperatures from 40-60 degrees. In fact
sixty degree water is warm to them.

There must be a proper scientific term for a cold hardy fish, which
describes pond fish, as well as fish from temperate climates.