I would advise otherwise... You should gut your fish on the river, as to leave as much nutrients in the system as possible... Also, those guts (once brought home) are likely going to end up in a landfill.... where they're gunna break down and and create greenhouse gases (methane being one)..... so yeah.... its a double no-no in my opinion.
Think about it.
Ive never had a problem with a salmon thats been in the truck in October or November for a few hours. I think once this year one was left long enough to go stiff, and it was still fine.
Your assumption that I trash the carcass was wrong. I de slime it take off the fillets and the rest goes back in the bag in came in, to be dumped either in the creek two doors down or wherever I'm fishin the next day. I also recycle and only use travel mugs, one of them is over ten years old lol. Plus volunteering, planting native species, pulling English Ivy, picking up all the line and junk i find etc etc. But thanks for the thought.