Hi..

Nick Cramer wrote:

I tried Mosquito Fish in my Koi pond a few years ago, but they didn't make
it through the winter, which is fast approaching, even here in Southern
California.

Hm.., there are two Gambusia affinis subspecies, an eastern and a western
type but only one is more or less cold resistent..

I guess mosquito fish are potential koi life food, too..

Does this pond have any refuges (plant-crowded shallow water zone)..?

--
cu
Marco