There are several terrestrials that can make the fish get tunnel vision and go selective. Ants are one of these and they usually end up in large numbers on the surface during autumn. We recommend that you use a J:son Swivel for all your fly fishing, no matter what type of fly you are using. However, it is necessary to use a J:son Swivel whenever you fish a size 1 or 2 J:son fly.
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