Koi Farming In Los?

I'm planning to have a 1 rai lake [pond] dug and want to stock some food fish [talapia and catfish & whatever else that tastes good], but i would like to try my hand at koi raising. Location is up north near CM, so we get cooler winter weather.

It seems that there may be more room for profit in raising ornamental fish over food fish, same as it's more profitable to grow flowers than food crops.

any input would be appreciated.....

thanks in advance,

jdg