"the phenomenon of reductionn in fitness following intraspecific hybridization (matings between individuals from different populations), either in the immediate hybrids or perhaps delayed until the backcross or later generations."

This is the definition of " outbreeding depression" from the text of " Population Genetics: Principles and Applications for Fisheries Scientists" , Eric M. Hallerman, Editor , AFS 2003.

If you want to read about it and have access to the book look at ppgs 242-245 para. 11.4.

You decide if it applies or not and what is at risk in your pond. Until the science is known and understood by disinterested Fisheries Scientists you take an unknown risk.

Hybrid sunfish have a very limited niche as described by Bob Lusk in his posts and books ( speaking of hybrid sunfish -- "...and the fish ,although hybrid , have a tendency to reproduce just enough to be a headache to a manager. When they do reproduce, they cannot physically be what their parents are, because they are "backcrosses," inferior to their parents. " [ Basic Pond Management , Lusk and McDonald 1993 pg. 36 ]. This is echoed by opinions of all the Fisheries Scientists I know or have read.

If you want GG in your pond it is up to you. I would make two suggestions --1) do not count on them to create self sustaining sunfish populations with the fitness of the original hybrids and 2) don't put them in ponds that have or will have other types of sunfish (BG/RE etc.)as you have no idea of what the results would be with an outcross of a GG x BG or RE will leave you with. ewest