The troll-like sounds from the Red-throated diver carry long distances between the mountains around Storavatnet. The high-pitched, haunting screeches on quiet evenings in May are a sign that the mating season has begun.
Water discharge at the outlet of the Ekso into Eidsfjord was halved after the big hydropower development in the mountainous area between Modalen and Eksingedalen and further southward toward Evanger in the 1960s, 70s and 80s. In an attempt to amend the changed environmental conditions in the waterway the developer built 35 small dams in the river.
There is still life to be found that is just “hanging on a string”. The Etne river has been the most important river for sports- fisherman in Hordaland after salmon fishing in Vosso was temporarily forbidden. As late as 2000, 4 tonnes of salmon and sea trout were taken out of the Etne river, the best fishing for 10 years. In the whole of the county there are only 15-20 rivers that can compete with this haul.
Plants that grow in and beside water have to be prepared for marked and rapid changes in their living conditions. They must be able to tolerate living under water without drowning, and getting totally dried out without whithering. Many swamp plants are well adapted to these kinds of changes.
Deep down between the stone polished phyllite bedrock in Bordalsgjelet canyon, there is a cascading river. In close cooperation with hard polishing stones, the water has carved into the bedrock for thousands of years - and is still doing so today.
The Vosso is Hordaland's main artery, she has never run more richly than in our times, and no other river in western Norway carries so much water. The increase in the amount of water comes mainly from hydropower development, due to the transfer of water from other water systems. Climate change can also be a reason that the Vosso carries more water than before.
There is probably no bigger salmon to be found in the whole wide world than in Vosso. The average size varies from season to season of course, but for many years this fish has had an average weight of over 10 kilograms. Thumping big ones of 30 kg. have been fished from the river, but one must go back to the 1940s for the last salmon of this size last that was caught.