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.
Large menger glass jellyfish in the Oslo fjord cause problems for both beachgoers and shrimp fishermen. The whole trawl was full before it reached the bottom where the shrimp are.
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