Fall temp changes 82/65 requires fasting or less feeding?

Thanks for the response and info. I did finally look it up and the scale for Koi is basically less and less food until the temperature drops below 45 then all feeding stops as the Koi go into hibernation until the temp raises again in spring. Fortunately even if I had a pond temps never go below 50 F outside here.
 
I feed mine year round since it doesnt get that cold here for long periods of time/
 
I'm just wondering if like mammals and reptiles that hibernate brings on disease if unable to do so.

I was talking to a man here at my LFS who has a pond and told me that if I decide to build a pond to dig it deep with sheer smooth sides so the coyotes and raccoons cant get and eat the fish at night. Apparently once they fall in they learn quickly to stay out so I think mine will have 2 foot sheer sides and be about 5 feet deep and maybe an electric fence (Fido Shock) on a timer.
 
First off fish do not hibernate. They are however coldblooded (their body temperature is the same as the environment). The speed of the fish's metabolism is dependent upon the temperature of the water.

So when the water is warmer the fish's metabolism works faster. In cooler or cold water the fish's metabolism works much slower. This means that they need a lot less food when the water temp begins to drop.

When it drops to below 55 degrees the koi metabolism is very slow and they are not very active. Since they are not very active they need very little food. Generally they can survive for several months off of stored fat alone and do not need food. They will eat small amounts if the opportunity presents itself though.
 
http://www.reference.com/browse/hibernation
"Cold-blooded animals (e.g., insects, reptiles, amphibians, and fish) must hibernate if they live in environments where the temperature—and hence their own body temperature—drops below freezing."

Q: Do fish hibernate?
Yes, koi and goldfish do go dormant in the winter time. Their metabolism automatically slows down when the temperature drops. It is suggested to not feed your pond fish while they are hibernating. Because of the almost dormant metabolism, the food will rot in your fish's intestine causing them to die.
 
The encyclopedia was very vague on the definition as usual. But my bad I forgot about mudskippers, killies, and such that do undergo hibernation. They will dig into the mud or climb into crevises in branches and go into a true hibernation.

Koi and goldfish however do not "hibernate" as they are active all winter (just reduced activity level). Hibernation is a very precise defination that is generally used to broadly in common usage. It has a very precise scientific definition that is constantly being argued about what species fits into the box. The change in body chemistry is actually very severe and there many different degrees of hibernation.

That will teach me to type and try to do the required harassment training at the same time. Waiting for the timed pages (cause it's got to last two hours to be legal) webpage to load left lots of time for me to do other things.
 
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