Aquatic Sciences Meeting, Albuquerque 2001

SS20 Biological Control of Harmful Algal Blooms: Role of Grazers, Parasites, Viruses and Bacteria

Date: Monday, February 12, 2001, Time: 4:00:00 PM

Location: Cochiti/Taos

Jeong, H, J, Dept. of Oceanography, Kunsan National University, Kunsan 573-701, Republic Of Korea, hjjeong@kunsan.ac.kr

DEVELOPING A METHOD OF CONTROLLING THE OUTBREAK AND MAINTENANCE OF RED TIDES USING MASS-CULTURED GRAZERS

I have measured growth and grazing rates of cultured protozoan grazers on cultured red tide organisms in big tanks in the laboratory and in mesocosms in nature, and those of cultured protozoan grazers on natural populations of red tide organisms in mesocosms set up in nature. The naked ciliates Strombidinopsis spp. are the most effective grazers on diverse red tide dinoflagellates. In mesocosm experiments, Strombidinopsis spp. grew well and effectively reduced cultured and natural populations of Cochlodinium polykrikoides, a dinoflagellate that causes great losses to the aquaculture industry in Korea. Acartia spp. fed well on Strombidinopsis spp. Therefore, a balance among C. polykrikoides, Strombidinopsis, and Acartia can be maintained after Strombidinopsis has been introduced into red tide waters dominated by C. polykrikoides. To obtain enough protozoa in a short period to control natural populations of red tide organisms, automatic systems of growing protozoa on large scales have been developed. This method can be used for controlling red tides in aquaculture farms that are located in small ponds, lagoons, and semi-enclosed bays.

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Aquatic Sciences Meeting, Albuquerque 2001

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