Abstract A subtidal population of the Japanese brown alga Undaria pinnatifida (Harvey) Suringar (Laminariales, Phaeophyceae), which has been cultured in the Ranee estuary since 1983, has been recorded by diving surveys of the subtidal rocky benthos at St. Malo, Brittany. A description of the occurrence of this alga is given and the possible competition between Undaria pinnatifida and the opportunist alga Saccorhiza polyschides (Lightfoot) Batters on the north and south Brittany coasts is discussed. Introduction The brown seaweed Undaria pinnatifida (Harvey) Suringar, known for centuries in China, Japan and Korea under the name 'wakame', has been subjected, particularly in the Japan and Korea, to intensive cultivation on long lines immersed in the natural environment. The palatability and nutritional value of this alga, the knowledge of how to grow it in nature since ancient times in Asia, as well as a very promising potential market has prompted some aquacultors to attempt cultivation and exploitation of U. pinnatifida in Brittany. The sea around Brittany displays thermal and other conditions similar to those found in seas of the Far East where Undaria is indigenous. First attempts at cultivation of Undaria pinnatifida in France were performed in 1981 (Perez et al. 1981),
Botanica Marina – de Gruyter
Published: Jan 1, 1993
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