Influence of alum on cyanobacterial blooms and water quality of earthen fish ponds

摘要: Eruption of blue-green algal blooms occurs frequently in eutrophic lakes and fish ponds, with associated unpleasant odor horrid scums. In the present study, we conducted a pre-test experiment 3 m(3) outdoor concrete ponds to determine optimum concentration aluminum sulfate (alum) required for reduction cyanobacterial without negative effect on growth. As consequence, 10 mg L(-1) alum was named as that applied 1000 earthen ponds. Obtained results showed Secchi disc values significantly increased from 24 cm after 14 days application. Alum-treated total phytoplankton counts by 94 96% compared corresponding controls days, respectively. Abundance algae treated decreased 98% control Consequently, dissolved oxygen, pH, phosphorus, orthophosphate, chlorophyll "a" content declined significantly. Our study revealed using is an effective way waters, especially water quality.