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<p>As an immediate countermeasure against cyanobacterial blooms in aquatic systems, on-site pulverization of cyanobacterial slurry may stimulate trophic transfer by enhancing the utilization of cyanobacteria by zooplankton. We verified the efficiency and effects of pulverizing cyanobacteria using an impinging jet device in a river connected to Lake Taihu, China. Colonies of <i>Microcystis</i> (mainly <i>M. aeruginosa</i>), ranging in size from 100 to 2000&#xa0;μm in the surface scums, were dispersed into single cells smaller than 10&#xa0;μm by the treatment, which consequently reduced <i>Microcystis</i> cell density at the surface of the treated site. Nevertheless, intact cells were often observed, suggesting that the dissociated cells retained their vesicles/vacuoles and buoyancy, which are typically damaged by other techniques (e.g., ultrasound, hydraulic cavitation). Microcystins in the ambient water did not increase after the treatment, which also indicates that the cell damage and subsequent release of toxins were limited. A laboratory experiment using dispersed <i>Microcystis</i> cells revealed that their edibility increased for bottom-dwelling Ostracoda, whereas it decreased for the completely planktonic <i>Daphnia magna</i>, probably because the cells were damaged and deposited in the experiment using ultrasound. These results suggest that the impinging jet can pulverize cyanobacteria with minimal cell damage and increase their edibility for zooplankton, particularly when the cells are retained in the water column.</p>

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Pulverization of cyanobacteria using an impinging jet to enhance edibility for zooplankton and facilitate trophic transfer in a eutrophic lake

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • Yasushi Iseri,
  • Aimin Hao,
  • Yujie Wang,
  • Ho-Dong Park,
  • Jianying Chen,
  • Jun Kikuchi,
  • Min Zhao,
  • Sohei Kobayashi

摘要

As an immediate countermeasure against cyanobacterial blooms in aquatic systems, on-site pulverization of cyanobacterial slurry may stimulate trophic transfer by enhancing the utilization of cyanobacteria by zooplankton. We verified the efficiency and effects of pulverizing cyanobacteria using an impinging jet device in a river connected to Lake Taihu, China. Colonies of Microcystis (mainly M. aeruginosa), ranging in size from 100 to 2000 μm in the surface scums, were dispersed into single cells smaller than 10 μm by the treatment, which consequently reduced Microcystis cell density at the surface of the treated site. Nevertheless, intact cells were often observed, suggesting that the dissociated cells retained their vesicles/vacuoles and buoyancy, which are typically damaged by other techniques (e.g., ultrasound, hydraulic cavitation). Microcystins in the ambient water did not increase after the treatment, which also indicates that the cell damage and subsequent release of toxins were limited. A laboratory experiment using dispersed Microcystis cells revealed that their edibility increased for bottom-dwelling Ostracoda, whereas it decreased for the completely planktonic Daphnia magna, probably because the cells were damaged and deposited in the experiment using ultrasound. These results suggest that the impinging jet can pulverize cyanobacteria with minimal cell damage and increase their edibility for zooplankton, particularly when the cells are retained in the water column.