It is somewhat common that crosses (hybrids) between the various bass species have been documented by scientists. Research suggests the most likely crosses to occur in the wild are between smallmouth bass and spotted bass ("mean-mouths") in river systems or some Ozark impoundments, or largemouth bass and spotted bass in some SE US impounded systems. Crosses between largemouth bass and smallmouth bass actually seem pretty rare.
Many anglers catch fish that they believe to be hybrids of some sort, but the only exact way to know is by DNA analysis. There is enough variation in morphology that you can't just look at a bass and know for certain that it is a cross, or to what degree the genetic material has been shared. That said, if you look at this picture that Jacob just sent me from Oneida Lake, you could easily imagine this to be a smallie-largemouth cross, with the predominant features appearing to be smallmouth related.
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