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Swimming and fishing is fully possible in Byfjorden (By Fjord). The water is of good quality most places, after considerable resources have been used in past years for clean-up. But, past sins still lie in the mud on the sea bottom. Fish that live in direct contact with the bottom sludge should not be eaten.
The Post-war Era came to Fana with its population growth and modern sanitary equipment. This had nearly catastrophic consequences for Nordåsvatnet as a recreational area. After the runoff water got re-directed to deeper water, and later also to the fjord outside, Lake Nordås won back both its swimming guests and its sports fishermen.
From 1938 until 1975 there was a large amount of trash dumped in Kollevågen. A lot of the garbage from the city of Bergen ended up here. The dump was up to 20 metres high, and much got dumped under water in the bay. When the dump was closed, the time had come to make good on a municipal promise to make the place into a recreation area. In 1978, nets and earth were laid over the dump, and afterward it was sowed with seeds. This was quite successful, and In 1983, the recreation area was opened.