noticed about 10 baby fish (no more =
than 1/2 long) and all of them are colors (white, yellow, orange) Does this
mean they are baby koi instead of baby goldfish?
I think Iremember reading that goldfish of this size are always black, so
ifthey're already showing colors, can I assume they're koi?

goldfish are black....but shubunkins and sarasas (types of goldfish) get color
very early. If you have a true yellow however they are probably koi. Jerri

http://www.fringeweb.com/Ponds/JerrisPond