HBG faster growth is relative. It is not genetic IMO. For example if you have a pond of all male BG and one of HBG you will get just as good of growth over time from the male BG as the HBG. Why? Because the HBG are 97% +- males. Male BG in a male only pond will use their energy to get big because they do not have to divert lots of energy to nest building and fry guarding. The reported evidence indicates that HBG grow somewhat faster early on because of their large mouth size but that edge quickly recedes because their metabolism and internal morphology is similar to BG who are larger and GSF which are smaller. The same principles apply - energy in = energy used + growth. There is a lot we don't know about both but nothing I have seen indicates that HBG digest and use more energy or have more efficient metabolisms than BG males. HBG are more aggressive which is a plus for fishing but in nature can be a minus due to increased risk of death by predation.

I would not be concerned about HBG taking over BG nest sites if the numbers are equal. There is a lot about BG nesting/reproductive behavior that favors BG males. I have not seen any material indicating if HBG inherit the knowledge/instinct of BG or GSF as to nesting. Interesting question.

Last edited by ewest; 04/14/17 03:44 PM.