Bill, I do not have an absolute answer for you, but on the Dunn's web site when I ordered some RES and CNBG, they also listed HBG but I see no where did they offer northern BG. So I would deduce they were using CNBG males and GSF females. But that is just my assumption.

Edit: I correct myself. Checked on their web site just now.
http://www.dunnsfishfarm.com/fish_pricing.htm

Said the HBG are either GSFx native BG or CNBG. So I guess it could be either. Pot luck maybe.

Last edited by snrub; 12/19/15 06:31 PM.
John

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