Picture of
Our largest alga

Perennial primary shoots


Summer and winter appearance


Origin and distribution

Japweeds journey to Sweden

Establishment in Sweden and Denmark

Establishment and development in the Koster area

Development along the Swedish west coast

Japweeds journey to Sweden 

The first finds of drifting japweed occurred in 1985 outside Fjällbacka. Loose plants or parts of have since been found along the whole of the west coast, from the Norwegian border in the north to Båstad in the Bay of Laholm to the south. Even the volume of loose and drifting japweed has increased in Swedish waters during the summer months.

Click on the figure to see japweeds journey to the Swedish west coast.

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Bo Johannesson | Martin Larsvik | Lars-Ove Loo | Helena Samuelsson