What is this ??!?!

[Larryfish]

so I was at the bait shop. Buying minnows. For my native tank. I bought 8 dozen crappie minnows like I always do. But they sold me this mixed in with the crappies. And I don't know what it is !
Please help me ID this fish. I don't have a clue !

 

[Bigfishnut]

Stickleback...looks like a brook stickleback to be specific. Great little fish. I keep several

 

[AG458]

It's a stickleback.