Blue catfish

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My LFS had them once, but i was unable to buy at the time. They were blues, I checked them over real good. And if you keep the temperatures right and don't over feed, they grow at a regular rate, not over the top like when they are wrongly put in a tropical tank. but they do grow slower than channels already. Good luck with your fish!
The chances that these blues you saw were just regular channel catfish. I has yet heard of a true blue catfish being sold in aquarium trade. Not mentioned that these blue catfish are not good aquaculture fish.
 
It will probably be easier to tell the difference once it gets bigger. Please post a picture!:)
 
It will probably be easier to tell the difference once it gets bigger. Please post a picture!:)

Nah you can look at the number of rays on the anal fins.
 
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