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Originally Posted by thebrick
I find goldfish are more active in heated water (76-80) In our pond they are sooo much more active in the summer and spring then fall and winter.
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That's because their body's metabolism naturally slows down in response to the cold weather. In the winter when the water temp goes below 53 degrees (as i recall, i may be a little off with the exact degree) the goldfish slow down and go into almost a hibernation stage until the weather starts to warm up. They also stop feeding. However, the hgih activity you see in the warmer months is normal but i doubt the water temperature is higher that the mid 70s in most cases. Just because they're active in water temps in the 70s doesnt mean that they will be even more active if the temp is raised higher.
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Current setups: 1800 gallon koi pond, 10 gallon planted, 150 gallon reef, other FOWLR tanks