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Abstract:
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This paper reports the analyses of cyanobacteria Microcystis spp. and toxin occurrence in bloom samples from some freshwater bodies in Vietnam. Six species of Microcystis (M. aeruginosa, M. botrys, M. panniformis, M. wessenbergii, M. flos-aquae and M. protocystis) were identified in 8 bloom samples collected from Lake Tri An (Đồng Nai province), Lake Bien Ho and Lake Duc An (Gia Lai Province), Cua Ngan, Dap Da, Nhu Y, Ho Mung sites (Thua Thien Hue Province), Lake Hoan Kiem (Ha Noi). The results of the quantitative analyses of Microcystis spp. and screening of microcystin by ELISA in the water are presented. The cell density of Microcystis spp. ranged from 11x103 to 624,5x103 cells/ mL1 and M. aeruginosa as the dominating species. In the water samples, microcystins detected by ELISA varied between 5.854 and 17.966 ng mL-1. The results from toxin analyses showed that there was no correlation between the total biomass of Microcystis and microcystins concentration in the same sample. |