Possibility for Water Quality Biocontrol: Observation of Microcystin Transfer in the “Cyanobacteria–Cladohorn–Fish” Food Chain
2022
Qin-Ming Xie | Yan-Wei Zhang | Ta-Jen Chu
Microcystins appear to be considered one of the most dangerous cyanobacterial toxins in the world. The accumulation and change of microcystins MC-LR and MC-RR in the “cyanobacteria–cladocera–fish” food chain were studied. <i>Microcystis aeruginosa</i> was fed to <i>Moina macrocopa</i> at three densities, 5.0 × 10<sup>3</sup>, 5.0 × 10<sup>5</sup>, and 5.0 × 10<sup>6</sup> cells/mL, and then passed to <i>Cyprinus flammans</i>. The total amount of MCs in the cyanobacteria cell extract increased with increasing density. The content of MCs in <i>M. macrocopa</i> increased with the feeding density of <i>M. aeruginosa</i>. In the final stage of experiments, MC-RR was the only MC that could be transmitted by <i>M. macrocopa</i> and persisted in red carp. In this study, changes in the concentrations of MC-LR and MC-RR in the liver of red carp seem to indicate some kind of transformation or degradation mechanism. It shows the possibility of MCs concentration-controlled biodefense in eutrophic waters.
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