Bill, I am not a molecular geneticist, however I did take a college course in molecular genetics. I think your idea could be done, but the lab would also have to have background DNA chromosomal data for all the other sunfishes, so the test fish data could be deciphered. Not a cheap, simple, quick or easy test. I am not sure which organizations have DNA chromosomal plots or DNA baselines for numerous fishes. I do know that Ohio State Univ has done DNA work comparing walleye and blue walleye. Dr Willis or Bruce C. may have some knowledge of this topic. A web search may provide some help.
POSTSCRIPT 10-7-05
Ohio Center for Aquaculture Development (OSU affiliate) has a grant to study growth characteristics of various hybrid sunfish. The study includes GG hybrids. The study is to end in 2007. In this study they may do a DNA testing to verify the parentage of the GG hybrid.
