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<p>Reducing phytoplankton biomass in warm water lakes by fish removal remains a challenge as omnivorous fish often recover quickly. However, bivalves may reduce phytoplankton biomass through filtering. To evaluate the impact of bivalves on phytoplankton community and water quality in the presence and absence of omnivorous fish, we conducted experiments in mesocosms with a bivalve-only treatment, with bivalves and omnivorous tilapia as combined treatment and without bivalves and tilapia as control. We found that the biomasses of total phytoplankton, microphytoplankton, and nanophytoplankton as well as the abundances of total zooplankton and copepods were higher in the combined treatment than in the bivalve-only treatment and control. The biomasses of total phytoplankton, nanophytoplankton, and picophytoplankton, the abundance of cladocerans, and concentrations of ammonium nitrogen (NH<sub>4</sub><sup>+</sup>-N), total phosphorus (TP), and suspended solids were lower, while light transmission and copepods abundance were higher in the bivalve-only treatment than in the control. We further found that NH<sub>4</sub><sup>+</sup>-N, TP, and suspended solids were higher, in the combined treatment than in the bivalve-only treatment. Our results indicate that tilapia reduces the positive effects obtained by the bivalves. We conclude that rehabilitation of native bivalves combined with removal of omnivorous fish could be a useful approach to restore eutrophic shallow warm water lakes.</p>

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The effects of bivalve on plankton community and water quality in shallow systems while co-occurring with omnivorous tilapia

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Zong’an Jin,
  • Hui Jin,
  • Xueying Mei,
  • Erik Jeppesen,
  • Lars G. Rudstam,
  • Zhengwen Liu,
  • Vladimir Razlutskij,
  • Yali Tang,
  • Xiufeng Zhang

摘要

Reducing phytoplankton biomass in warm water lakes by fish removal remains a challenge as omnivorous fish often recover quickly. However, bivalves may reduce phytoplankton biomass through filtering. To evaluate the impact of bivalves on phytoplankton community and water quality in the presence and absence of omnivorous fish, we conducted experiments in mesocosms with a bivalve-only treatment, with bivalves and omnivorous tilapia as combined treatment and without bivalves and tilapia as control. We found that the biomasses of total phytoplankton, microphytoplankton, and nanophytoplankton as well as the abundances of total zooplankton and copepods were higher in the combined treatment than in the bivalve-only treatment and control. The biomasses of total phytoplankton, nanophytoplankton, and picophytoplankton, the abundance of cladocerans, and concentrations of ammonium nitrogen (NH4+-N), total phosphorus (TP), and suspended solids were lower, while light transmission and copepods abundance were higher in the bivalve-only treatment than in the control. We further found that NH4+-N, TP, and suspended solids were higher, in the combined treatment than in the bivalve-only treatment. Our results indicate that tilapia reduces the positive effects obtained by the bivalves. We conclude that rehabilitation of native bivalves combined with removal of omnivorous fish could be a useful approach to restore eutrophic shallow warm water lakes.