Bigger than its mouth. If it won't fit in its mouth the worst it can do is try and fail. If its too small it may not get eaten, but may get stuck in its mouth/throat. Not sure what size to suggest cus im not sure on your species of catfish or how big it gets. As to the dat, try and post a pic. Even a pic on your phone. ITs can vary in colour/ stripe pattern or number of stripes. Is that the differences you meant?
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The catfish is A achara catfish I.e False Perruno. It can reach 100cm from my knowledge but usually smaller. As for the Dat, MFK won't let me post pics :$
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