So it seems to be much harder than I thought to identify fish! From the pictures it looks like they are two different catfish? Thank you for pointing out that it is not a madtom, So from the reference book I have it looks like the only catfish found in the area are White, Channel, or Bullheads; So to distinguish between these which would be the key characteristics that are different?
So the ticket here is to look at the chin barbel coloration, and that will be quite helpful next time. Identifying fish is surely an acquired skill, the more you see the better you get. A few years ago, I struggled on every fish. I still struggle with many, but nowadays, I can look at a net full of fish, and ID most with a quick glance. The more you do it the better you will get. Eventually it won't even be key characteristics, it will become almost second nature. Keep up the good work, and don't get frustrated. My best advice to you is to spend the time with a book, and come up with your best guess at the species. Then post here for confirmation. It is kind of like when you follow someone in a car to a destination. Well, you don't know where the heck you are. But if you find it on your own, you know it, and will know how to get there again. Good luck!