In many states, crappie, bass, pan fish, pikes, and all other game fish can NOT be kept if caught with a seine. In many states, the ONLY legal method to take these fish is by hook-and-line (or pole-and-line; check your state's regs), regardless of their size.
You can buy tiny hooks if you like, meant for fly fishing. You can either bait these with tiny worms, etc., or you can use small fly fishing flies and float them on the surface (or work them slowly if they are wet flies). I've also seen little lures meant for catching things like very small sunfish for use as cut bait.
Dipnets and seins are perfect for non-game species, but can not be recommended for game fish on this board.
I am with this person. I believe in most states the fish you listed are game fish. I have caught a largemouth bass believe it or not on a number ten hook with a cricket. Oh ya the size. Less than one inch long. They have large mouths. Now in some states you have size regs so you have to watch out for that to. It is my recomondation you read the rules and then read them over three more times. Some things are hard to catch and look gray but believe me the Warden knows what is black and white. Read Carefully before taking crappie, bass, catfish etc etc with any sort of trap or net or seine.