That is an awesome question, but unfortunately I can't answer that. I will promote your post so hopefully you can get an answer, but I don't know how quickly. That would probably need to be answered by someone with both fish and genetics background. I don't know if we have people visiting here with that sort of background. I look forward to reading the answer though. Have you tried to search the web for Jack Dempsey genetics?
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Phishie
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"An ounce of prevention is worth a pound of cure."