Cultivation of a brown alga, Undariopsis peterseniana (Kjellman) Miyabe and Okamura, as a warm-temperature species by artificial seed production in Korea

摘要

Undariopsis peterseniana is an endangered annual brown alga in Udo, Jeju Island, Korea. There is current interest in the commercial-scale aquaculture of this species for warm-water species development in Korea. Growth and maturation were investigated from January to December 2007 in their natural habitat. Zoospores were transplanted into an intensive seaweed culture ground in Wando, southern coast of Korea, for the mass cultivation of this species. Indoor and outdoor cultivation were conducted from June 2007 to May 2008. Mean production obtained from the zoospore seeding was 31.1 ± 1.5 kg wet wt. m−1 of culture rope during the cultivation period in situ. Transplanted F₁ thalli in Wando had a length 1.7 times longer than their parents in Udo, and their maximal growth period changed from June (at 19.9°C in Udo of natural habitat) to April (at 14.0°C in Wando of culture ground). The relationship between optimal water depth for culture and underwater irradiance during the U. peterseniana cultivation was defined as: y = - 0.78 ×+ 7.67( r2 = 0.92 ) y = - 0.78 times + 7.67left( {{r^2} = 0.92} right) . This study indicates that U. peterseniana could be successfully transferred to the northern coast beyond the original habitat in Jeju Island.