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I have had some issues with the vacume sealer if you dont do it right. If you try to seal the fish while the filets are still wet moisture will get into the seal and durning the frezzing process the seal will crack causing air so slowly esacpe in. What I have found works the best is dry you filets completly and lay them on a cookie tray. then put them in the frezzer for about 20-30 min uncoverd. Once the filets are begining to firm take them out and vacume seal them. Works the best for me.
I fillet, soak in bowl of ice water for a couple hours, and vac seal. I used to use the foodsaver, now I just use the ziplock vaccuum bags with the hand pump. Last year I did all my fish and venison in those zip lock bags and they came out great.
I have to agree, vac sealer is the best. Not only do I seal my fish but I do my deer and when I buy beef, pork, or chicken I get big packages cheap and seal individual meals. Bags can be expensive but with a little practice you can figure out how to get the most out of them. It really does pay for itself in the long run. I started with a cheap one and it lasted about 3 years, so when it crapped out I got a better model and haven't had a problem in almost 4 years now.
fillet, rinse and put in a zip-lock bag or similar container full of water. Cheap and easy.
Ziplock bag full with water, and squeeze the air out of the rest of the bag.