fancy goldfish temp. hardiness

I would venture to guess that the only good thing about having the "winter" period, would be to jumpstart breeding when the temperatures warm up. Otherwise, I personally believe that it is putting unneeded stress on the fish and will untimately result in a shortened life span. Temperatures that cold will cause stress on the body. Especially for the fancies who aren't bred for cold temps.
I had read in several places that it makes them grow faster during the summer months if they go through a winter inactivity state. I suppose this only applies to common goldfish.
 
I simulate winter-summer seasons in my goldfish tank by pumping some of the water outiside through a fish-safe radiator.

during winter, water gets down to the mid 50's. Only effects i noticed are increased spawning behavior.
 
I simulate winter-summer seasons in my goldfish tank by pumping some of the water outiside through a fish-safe radiator.

during winter, water gets down to the mid 50's. Only effects i noticed are increased spawning behavior.
thanks, that's all I needed to know.
 
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