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

Establishment and development in the Koster area

During 1987, the first finds of attached japweed were made in the Koster archipelago.
Thereafter, as shown above, japweed spread until 1996 when the last survey was made. 1 NM = 1 nautical mile.    

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© Aquascope 2000   Tjärnö Marine Biological Laboratory, Strömstad, Sweden
Bo Johannesson | Martin Larsvik | Lars-Ove Loo | Helena Samuelsson