Not necessarily true, we had small flatheads in stock that readily accepted pellets and cut fish like tilapia, shrimp, night crawlers.Flathead catfish are carnivorous. They are not going to eat prepared food. Period. No discussion. That's just the way the species Is. If you keep the flathead in the koi pond they will outgrow the koi and other catfish and they WILL EAT THEM. Again, that's just how they are. You will not ween flatheads on to pellets or blueberries or anything like that. Live or maybe maybe maybe cut fish will be just about all they will eat.
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