Thank you all for you help! I truly appreciate it! to everyone that replied! Thanks again!

Okay. I'm Rachel, and I'm reading Huck Finn, and I need to answer some questions about catfish, and I was hoping you guys might help me out. First off- What does a catfish look like? How big does the fish get? Oh, and please don't flame me, but... Is it good to eat? Thanks in advance for you help!