Removal effects on harmful algal bloom species of eco-friendly algicidal substance ‘GreenTD’

Abstract

Since the 1960s, the frequency of harmful algal bloom events has gradually increased, and it has been causing serious ecological and economic problems in Korea. Particularly, massive blooms of Cochlodinium polykrikoides caused and severelyincreased economic losses of fishery industries due to fish mortality in the coastalarea, and blooms of Microcystis have been causing serious water quality problems in fresh water system. A novel algicidal thiazolidinediones derivate substance, ‘GreenTD’was developed. From the results of screening test using C. polykrikoides culture, the suitable concentration of GreenTD was 1 ppm for field application. In microcosm test (20 liter), chlorophyll a., active chlorophyll a., Fv/Fm and cell density of bloomed Microcystis was rapidly decreased after one day of GreenTD inoculation of 1 ppm. Algicidal efficiency was 93% at 4th day of microcosm.ncreased economic losses of fishery industries due to fish mortality in the coastalarea, and blooms of Microcystis have been causing serious water quality problems in fresh water system. A novel algicidal thiazolidinediones derivate substance, ‘GreenTD’was developed. From the results of screening test using C. polykrikoides culture, the suitable concentration of GreenTD was 1 ppm for field application. In microcosm test (20 liter), chlorophyll a., active chlorophyll a., Fv/Fm and cell density of bloomed Microcystis was rapidly decreased after one day of GreenTD inoculation of 1 ppm. Algicidal efficiency was 93% at 4th day of microcosm.