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 ability to tolerate varying salinities is obscure. Adult plants can tolerate a salinity down to about 20 per mill (2%) while retaining vital functions and can survive in concentrations down to about 9 per mill. Little is known about the effects of low salinity on reproduction, sprouts, bottom falling and young plants, but there are reports of sprouts surviving down to about 6 pro mill (0,6%).
   From 0°C and up to approx. +25°C growth increases. The perennial primary shoots tolerate temperatures below 0°C.

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