The invasive Pacific oyster is spreading rapidly in Oslofjord, causing injuries to bathers and threatening local ecosystems, with Oslo municipality now offering a reward for their removal.
Scientists now say that the harmful alga will survive the winter and that it will probably turn green in the Oslo fjord next year as well.
The tick can carry hemorrhagic diphtheria. The disease is widespread in the Middle East, Africa and Asia. In addition, some cases have been seen in southern Europe. The fever can cause serious illness in humans.
Hundreds of guillemots go astray in the Oslo fjord every autumn. Many are now starving in the food-poor fjord.
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