Troutline Tactical Jan's Caramel Gammarus BL Nymph is probably the most efficient gammarus that works in Slovenia. It is made for fishing in south part of Slovenia on Irdijca and Soca rivers. It is a fly that works in middle of summer and is efficient for picky marble trout. The fly is tied on Hanak hooks and has the body made of lead coated with special porcelain coating and over coated with UV resin