10-27-2012, 11:52 PM
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Originally Posted by RackinRocky
I don't mind at all--and I learned something! I never knew goldfish shouldn't be kept below 70.
Just wanted to clarify that I'm talking about modern
fancy goldfish. The fancy goldfish that the Japanese and Chinese raised in ponds 100 years ago didn't have the same amount of modification as today's fancies. Single-tail goldfish do fare better and live longer in ponds with temps below 85F. Fishbase.org lists their temperature tolerance as up to 100F.
Originally Posted by cwmorrow
They are cold water fish and live and breed in my outdoor pools in Zone 7 without heat.
They do become dormant below 50 F and should not be fed during the Winter. They have no real stomach, merely a knot in their intestine about the size of their eye, and food will indeed rot there at low temperatures.
Fancy gold fish may fare worse outdoors, but the Japanese have kept them outside without heat and developed ornate types for hundreds of years.
Goldfish aren't actually coldwater fish. A true coldwater fish like trout or sturgeon would die at temperatures that goldfish thrive. Goldfish are temperate fish meaning they can survive a wide range of temperatures from just above freezing to around where discus thrive.
As for the fancy goldfish the Japanese and Chinese kept, I have already addressed that. Looking at images of fish from that time and the fancy goldfish we have now, you'll see there is a greater degree of modification in the modern fancy goldfish. This is why necessitates the warm temperatures. Those highly shortened bodies need all the help they can get, and one of the easiest ways to do this is to not subject them to lower water temps.