1Fisheries Promotion Section, Agriculture, Forestry and Fisheries Department, Oita Prefectural Office, Otemachi, Oita 870-8501, 2Agriculture, Forestry and Fisheries Section, Hiji Town Office, Hiji, Oita 879-1592, Japan
An outbreak of the sea anemone Boloceroides mcmurrichi occurred in a Caulerpa lentillifera (Umi-Budou) aquaculture farm in Oita Prefecture in March 2008. The sea anemone adhered to cultured Caulerpa thalli and considerably deteriorated its commercial quality. In order to remove the sea anemone from cultured Caulerpa, the effects of immersing the thalli in fresh water (tap water) and vinegar-seawater solution were examined. In fresh water, thalli were immersed for 1, 2, 4, 10, 15 minutes and 12, 48 h. In vinegar-seawater solution of 5 and 10%, thalli were immersed for 1, 2, 3, 5 minutes and 0.5, 1, 2, 4 minutes, respectively. The optimum immersion time, in which annihilation of sea anemone and no influence on Caulerpa occurred, were 15 minutes in fresh water, and 5 and 1 minute in 5 and 10% vinegar-seawater solution, respectively.