I think it'd work, but you may want to get something like a Frosts Mora for the fishing. The Kumo would definitely be thin enough to do the job, but I'm not sure how flexible it'd be. I'm not a fisherman really, though (like it well enough but just not good at it), so you'll probably want a second opinion!
I think it'd work great as an EDC item, though, as I imagine that's part of what RJ designed it for. I'm lucky enough to have one of his fixed blades and it make a superb EDC blade.