gar eat them

Carp, dace, ides, gars, chub, pike

Large pike or alligator gar may eat small bass, but adults are rarely taken.

The population of Mohammadabad-e Gar Gar is 80.

Yes, but depends on the species, just like it does in salt water fish. Just because you can't see a fishes teeth doesnt mean it doesnt have any. Many fish have what are called phyringial teeth, which means they are set further back in their mouths/throat. Carp are a good example of a fish having this sort of dental arrangement. Good examples of freshwater fish with prominent teeth are piranah's, gar, pike etc!