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After the ice age, Granvin Fjord reached all the way up under Skjervsfjossen waterfall. Just a thousand years later, as a result of the rising of the land after the ice melted, this whole inner part of the fjord freed itself of the sea and became Granvinsvatnet lake. In spite of this rise in elevation, this waterway is still navigable for fish: Sea trout have wandered into Granvinsvatnet in more recent times and evolved to become freshwater trout. And salmon and sea trout made the journey 13 kilometres up the Storelvi river.
The wild rabbit is really native to Northwest Africa, but the Ancient Romans introduced them to large parts of Europe. Not to Norway, rightly enough: the population on Fedje originated from 3-4 pairs that were brought here from the Shetland Isles in 1875, making this their first residence in the country.
When the debate about building a pontoon bridge over Salhus Fjord was raging, some were afraid that the bridge would disrupt the ecology of the fjord system inside. The worst predictions did not prove true, but it is easy to see that there was a change: the Puffins have gotten a new food platter after the Nordhordaland bridge was built. Its favourite meal, mussels, thrive on the pontoons that are the foundation for the bridge.
Around Mjøsvågen here is still a compact marine use area. Some of the buildings are common boathouses, but most of them also house small enterprises and workshops. This is where the farmers from Øvsthus, Mjøs, Hole and other farms have supplemented their meagre incomes as smiths, brass moulders, clog makers, chest builders and decorative painters.
The Strandaelvi river is forever protected from the development of hydropower. The Lønaøyane islands – which comprise the delta furthest north in Lake Lønavatnet - are a part of this water system. In 1995 the level of protection for the Lønaøyne islands was strengthened to that of a nature preserve because of the rich birdlife in this wetland.
Mykdal delta had an unusually diverse bird life, right up until 1987. The Myrkdal delta should have been protected, and the plans were prepared. Despite the area's high elevation at 227 m a.s.l., it had a wide variety of bird species compared with other fresh water wetlands in inner Hordaland. Several of the bird species were also unusual for the region. The delta had for example a permanent nesting colony of Eurasian Wigeon, believed to be the only one of its kind in the municipality.
Down by the fjord on the farm Berge in Tørvikbygd, is Stekkavika – a sheltered eastward facing harbour, protected against the fjord by headlands and rocks, even manifest in the name. Here is also a comprehensive milieu of coastal industry, with boathouses and sea-sheds that belong to the farms Berge, Heradstveit and Halleråker. Belonging to the farm Berge there is also a mill-house, circular saw, workshop for sloop building, and – a little further up into the woods – the old water-powered sash-saw.