I really don't have a clue why blue catfish are in so many other lakes that have never been stocked but they are not in joe pool, arlington, etc.
Arlington is probably too small and too shallow plus it was at one point heavily stocked with channels which there are a lot of large channels. Arlington has a lot of gizzard shad too which helps.
Pool doesn't have hardly any gizzards. There are lots of undersize, stunted fish in that lake. And way to many 8 and 9 inch sandbass. Lots of skinny channels too. The LMB population has finally produced some decent fish over the last few years due to the slot, but I think the main problem with that lake is a lack of large gizzard shad and too many sandies eating all the threadfins.