thats some fish mon .. looks like a lot of drying work!
in scotland they (very) rarely come that big, but still a 5 kilo/ 11pounds odds fish, or a few trout is more than i want eat in a day and would be good to know a quick and easy drying method.
hanging it over a fire seems simplest solution but in scotland that could be a lot of effort, at least it looks like you got lots of trees handy over there! not always easy to find trees here in some moorland areas (so rigging any kind of frame can be difficult) and even local fuel for fire can be hard to find; or a lot of work, especially when you've hiked in and spent a good day fishin, or just wantin a bit time to look at the view
like folks have said sometimes best option is to try and get it home , though that might be 2-3 days away. i clean the fish right after catching which slows it going rotten and carry with heather through the gills-mouth. i maybe boil and eat some of fish first and to walk out i put fish into plastic bags (not ideal but otherwise v messy in pack) , it lasts better if wrapped in ferns/bracken first.
heres a wee'er salmon but still plenty tasty!