Toothed wrack

Picture of

Distribution in scandinavian waters

Maximum length: Toothed wrack can be up to 1 m tall.
Appearance: The edges of the leaf-like body are saw-toothed. Toothed wrack is flat and has a fan-shaped form. There is a visible nerve in the middle of the lobes. The leaves (fronds) are devoid of air filled bladders, but on occasions the upper most part of the frond can became oxygen filled. Its colour can vary from a yellow-green to dark brown.
Depth: Along the Swedish westcoast they can be dominant in banks from low water and to a depth of 4 m. In the Baltic, dense populations can be found down to about 15 m.
Environment: Found on rocks and cliffs.
Misc: The plants are single sexed. The granular and flat receptacles (reproductive organs) form at the top of the shoots during the late summer, and reproduction takes place from the winter and into the spring. When the receptacles have fulfilled their task, both they and the shoots wither and die. Read more about the biology of the bladder wrack.
    Many organisms thrive on toothed wrack. The dark patches seen on the above pictured plant are ectoprocts (small moss-like creatures), sea-mats, while the small sparse ”bushes” are hydroids.
Classification: Toothed wrack is a member of the brown algae group.

Toothed wrack     Other names

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