I've heard this before. What's causes freezer burn in meat is air. If the meat is submerged in water then frozen, you essentially have a giant ice cube. No air can get into the ice cube, thus saving your meat from freezer burn. I've never tried it, but then again I've also never caught enough fish at one time to freeze any for later. lol I believe I read about this theory in field and stream. I may be mistaken tho. Hope this helps!
Jesse
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