There are wildlife rescue agencies that are always willing to help. The goose could be rescued and placed in a zoo or compound. Just sayin!
I don't think they would go to the effort of saving one goose out of hundreds. Hunting season is still in progress for geese down here and he may have even been shot. The wildlife services patrol this spot often during each day and I am sure they have seen this goose as it is swimming alone away from the large concentration in the reserve. It would be nice if they did, but I don't see it happening. Thanks for looking, Donkas1946.