Mine just eats and eats and eats. I actually bought him for my brother. He lives in a 15' x 8' x 30" deep garden pond. You will need a de-icer. Other than that, very hardy. Ours grew from a small 3" long fish to over 30" long in less than 3 years.
Yes that has been mentioned multiple times on this thread. The pond will not entirely freeze up because there's running water. I was asking how much do I want to feed my channel cat when the pond is mostly frozen over or when it's cold out.
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