I always froze fresh caught fish in water, because fishermen told me to
I guess this is why...I wouldn't go to the trouble of glazing, the other 2 methods are best, but I always just filled a freezer bag half full with fish, then filled it up with water and froze the fish that way. And yes, you can freeze filets, thats the only way I want fish to come out of the freezer.
Most commercial fish fillets are "sheeted" in ice...
It prevents the air from reaching the actual meat and solves the question of "freezer burn" at least for awhile... I had abalone frozen in a block of water that was as good as freshly caught.