When you start talking pure representative of given species, we are finding things are getting much fuzzier with hybridization event frequently being impactful to one or both species involved. Even humans we are seeing are not escaping that. The events can be many, many generations back.

I would treat the bass you purchased as pure. If producer knowingly crossed then issue to be had but why cross Spotted with LMB?

Aquaculture
Cooperative Research / Extension
Lincoln University of Missouri