SERNAPESCA (Chile's National Fisheries and Aquaculture Service) is the authoritative source for fishing regulations in the Aysén Region and can provide current licensing requirements, species regulations, and seasonal restrictions. Local fly shops and outfitters in Coyhaique, the regional capital of Aysén, would have firsthand knowledge of rivers in the area, including Río Añihue, and can provide guided trips, gear, and up-to-date conditions. Patagonia fly fishing operators who specialize in the Aysén Region frequently have detailed river-by-river knowledge and may have specific information about Río Añihue. The Añihué Reserve appears to be associated with this area, and contacting the reserve directly may yield access and fishing information.