I get this question a lot since most of our fillets have skin on. The skin is actually pretty easy to remove.
Here are the steps:
1. Keep them frozen
2. Grab a hold of any corner of the skin that you can get a hold of.
3. Run hot water out of the faucet
4. Put the skin side of the fillet under the hot water and peel the skin off.
Usually peels off very cleanly without much loss of meat. Your hands will get very cold if you are doing a bunch, so you may want to try using gloves or a pliers.
Sorry I haven’t posted in a while–new project to announce in the next few weeks!