A few years ago, I met a fellow in Russia that was fishing for, and landing, Atlantic salmon on two weight rods. That doesn't mean that you could do it, or that it is good for the fish that you area supposed to be releasing in good shape.
Also it is my understanding that 10 wt rods are now being used for big tarpon, instead of the 12 wt that were used a few years ago. They just don't try to land them: break 'em off after 30 or 40 minutes of fun. That may be better for the fish!
Most people will probably recommend that you use something bigger, but if that's what you have, it's not against the law ( I think)
I think line weight is variable when it comes to the Thompson. The considerations are wind, casting/fishing distance, size of the fish, and an interest in landing them quickly. For these reasons I very seldom go below a 9 weight on the river, and most often choose a 10 or 11. I've landed 18 lb T-fish on the old 7136, but the 7141 is a more powerful rod and seems more like an 8 wt to me, so I think it might be a better choice for lightline fishing on the Thompson.
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