Fresh salmon, left out in cool (~55° F) weather for about 5 hours.
I forgot to pull my fish out of my otherwise non-perishable filled grocery bag.
I'm leaning towards dumping it, especially as I'm feeding it to other people. But it was very fresh, and the relatively cool ambient temperature and internet searches so far make think it's probably completely safe. If there's better data to move it to definitely completely safe I don't want to waste it.