The "central artery" of Gauja National Park is the River Gauja, where you can find the route"Spawning of salmon fish in Gauja National Park",  with many tributaries. Many of these are rapid and swift, with clean, unpolluted water enriched with water coming from many springs, and therefore they are suitable for spawning of salmon-like fish — the Atlantic salmon (Salmo salar), brown trout (Salmo trutta), and stream trout (Salmo trutta fario). After a longer trip, the salmon-like fish travel in autumn to their birthplaces, and thus this is the time best suitable not only to watch the fish but also to enjoy what is happening on the riverside. A salmon watcher is a sort of a ranger, who has come to study the natural environment and create a positive effect from the presence of a human being.

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