A good fish, largemouths get from roughly 13 to over 36 inches long.
Diet can include: fish (never goldfish), earthworms,pellets,grasshoppers,cicadas,crickets,ghost shrimp,crayfish,etc
They are prone to obesity so holding food in your hand and making him chase it appears to be beneficial.
Tankmates:avoid anything that can fit in their mouth or might eat the bass,other than that many tankmates can be kept ,oscars work well.