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Maybe consider a small revolver that shoots .45 Colt and .410? AFAIK, it's not hunting if you're really in danger and protecting yourself, but if you pull the trigger you'll likely have some splainin' to do, so it should be a last resort.

Was Perry on his land when he shot the aggressive coyote? I don't think so. . . I seem to remember he was on a trail. If a snake is actively boarding your vessel or other precautionary methods (paddle away, hit with oar) have failed, the .410 might be the right course of action.

I'd be interested to hear others chime in. In bad situations, you can shoot a dog on a walk through a neighborhood, I think you can build a justification for shooting a snake in the wild under certain circumstances.

If you're looking for permission to clear the river of everything floating on the surface as you pass by (I don't think you are), then I certainly wouldn't condone that.