Bonk and Bleed immediately ,,,heart beat still remains long enough to purge all damaging Blood. Ice is a must if available,,,,especially on the smaller fish ,,,pinks , coho etc. A fish left in a beach rock enclosure in dead water will heat to 100 deg. (35 c) Burlap is great if you can find some bags.
The best quality quick frozen fish that come out of the commercial plants from Alaska are NEVER cleaned on the grounds but bled only. They are always heavily iced or frozen in the ROUND and shipped south . Immediate dehydration begins when the belly cavity is opened to the air. If you will be consuming the fish with in hour plz clean it and keep cold. If a time will run before you pull it out of the freezer keep it in tact as long as you can . I have smoked or filleted fish up a year in the freezer and they have a few dry fins but the flesh is still prefact.
Sound gross but it really works.........trust me . Try one of your sockeye this summer, one cleaned and put away the old way & the other left in the round............ decide then whats best..........