Need help identifying a fish

[calepo]

I need help identifying this baby fish. I recently had a pond installed in my backyard and the landscaper added some plants that he harvested from a local river and then these baby fish started showing up. (Eggs attached to roots?) Thanks for your help!

Oh, it would probably help is I gave you a location. I live in Southern California and the plants came from the Kern River area.
[signature]