Do your self a favor and get a vacuum sealer. I as well do all my salmon fishing in one week for the whole year and I have been running a vacuum sealer for the last 5 years and it has made the whole difference. I always gut and clean my fish as soon as possible, this is usually at the dock. The smaller fish are beheaded and gutted and washed clean then vacuum sealed and in the freezer. The large Chinook are filleted left joined at the tail then in the sealer and froze. It takes a bit of practice to get the sealing right when dealing with wet products and losing the seal on the bag. This can be eliminated by laying a rolled out flat piece of paper towel along the bag just inside of the seal, as the vacuum sucks out the air the towel catches and holds the moister leaving a nice dry seal that last for ever. The large fish are used for canning and smoking at a later date. We will take out 2 or three fish, thaw them, smoke one and can a couple, enjoy it and repeat as we want. The ones left whole are left for eating however one may want. But let me be honest with you,, if done right vacuum sealing is the closest thing to eating fresh there is. It is remarkable. A Coho can site in the freezer for 8 months and when you thaw it it is so darn close to fresh its remarkable.. Way better than anything you can buy in a store.
Another thing I have done is the last few years I have brought my own freezer out with me. I bought a small apartment freezer that I load in the back of my truck and unload it where ever I stay. I crank it as cold as possible and my fish freeze fast. and they are mine. Too many times I had fish sit in a camp ground or lodge freezer for 2 or 3 days and not be frozen yet. They have to many fish in them and to many guys opening them all day and the fish don't freeze right. The product is of poor quality.
Lets face it,, it costs us a bundle to do that fishery we may as well spend a couple more dollars to ensure our product is as best cared for as it can be. We spend $50,000.00 (min) on boat and gear and don't want to spend a few more dollars to ensure the fish is taken care of.