Papa Doug Roach

I have a similar problem with the Legendary Gar the one in the Swamp. I caught him and mailed it off but it never registered. So I tried going back and trying again over several days and all I catch are Lake Sturgeons. I've tried resetting my console. I've waited several days. I even fish there straight through for 2 whole game days nd no luck. It seems like all is lost and this is a total waste of time. Anybody have any ideas oter than starting all over from scratch?