The long and 'river-like' inlet with streaming water makes ideal growing conditions for seaweed and mussels, which was scraped for use as angling bait up until the end of World War II. Late in the 1970s, increasing agricultural eutrophication and further reduced water exchange from the growing mussel banks in the inlet led Botn to an ecological crisis with surface algal blooms and lifting of very poisonous rotten bottom water. To improve conditions the municipality of Rissa restricted the eutrophication in the drainage area and installed a bubbler facility (like in an aquarium but bigger) at a depth of to distribute more of the water exchange to deeper levels.