Learn something every day.
For blue and channel catfish, no minimum length. Daily bag and possession limit = 50 blue and channel catfish in any combination, of which no more than 5 may be 20 inches or longer. For flathead catfish, minimum length=18 inches and daily bag=5.
I personally only keep channel or blue cats from 12 to 16 inches or 1 to 3 pounds.
With a daily and possession limit of 50 fish, you can put a lot in the freezer quick. If you find them and get them to bite that is.
It's the Bill of Rights, not the Bill of Needs.