Rice is a carbo and therefore easily converted into simple sugar. NOT what you want to be feeding your koi on a regular basis. If you feel you want to feed a grain go with barley. I use garlic salt while it is cooking to add flavor. It has very little nutritional value but good roughage. i feed it in conjunction with hikari sinking wheatgerm.
let's look at it from a common sense viewpoint...in japan where rice is a main staple and koi has been around for a very long time, do they feed or recommend using rice...( would seem to be a natural ? ) NO! they don't Ummmmm, must be a reason.
If you have access to the KHA online lesson plans that our advisors learn from for AKCA there is quite the push to educate about the value of protein ( in lesser amounts) for winter time use as opposed to feed with carbos in them.
Thanks for asking the question, but it seems with all things koi there is more to thier care than meets the eye
