I agree that a photo and a fiberglass reproduction is the best way to go. If you must do a skin mount simply put the fish in the fridge ASAP and get it to the taxidermist. Don't worry about it losing color - they paint them anyway.

Do not clean it and try to keep scale lose to a minimum. Tnat's all there is to it. But . . a fibreglass mount will last longer, look better and not kill a trophy class fish. We need the bigguns to spawn!
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No huevos no pollo.