No doubt there is a lot to learn about each fish species and cross including HBG and their many variations. I have not found bias or questionable science in any of the approximately 50 studies and compilations I have seen on HBG , lepomis and centrarchids and their crosses. There are a couple conflicting study results. I would like to see any study that has bias or questionable science.

I doubt very seriously that any of the scientists who did the studies or wrote the papers I have seen (on HBG or otherwise) would risk their reputation on bias or questionable science in a study that is subject to extensive peer review prior to publishing and open review by his peers after publication.

Norm to answer your question Laarman (1979) found that reproduction by BG was 279 times greater than that of HBG.