In article ,
redsockfluff wrote:

if the temp is below 10 degrees C then you should not feed your fish
in your pond. they can last the winter without food because the cold
weather slows their metabolism right down

red

If you feed them and the water temp is below 12c/54f then the food they eat
will not get digested and it will expand in their stomaches, decay and
eventually cause their death.

If you need to feed your fish in the winter then use Sera Koi Professional
Winter Food or TetraPond Wheat Germ Sticks.

UK:
http://www.reptilica.co.uk/product_info.
php/product/Sera_KOI_Professional_Winter_Food

US:
http://www.gardenponds.com/fish7.htm

See:
http://www.feedingkoi.com/koi_feedin...old_water.html

-Hank