Toxicity of the microcystin-producing cyanobacteria Microcystis aeruginosa to shrimp Litopenaeus vannamei
文献类型： 外文期刊
作者： Xu, Yu 1 ; Xu, Wujie 3 ; Hu, Xiaojuan 3 ; Su, Haochang 3 ; Wen, Guoliang 3 ; Yang, Keng 3 ; Cao, Yucheng 3 ;
作者机构： 1.Sanya Trop Fisheries Res Inst, Sanya 572018, Peoples R China
2.Key Lab Efficient Utilizat & Proc Marine Fishery, Sanya 572018, Peoples R China
3.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Guangzhou 510300, Peoples R China
关键词： Microcystis aeruginosa; Microcystin-LR; Litopenaeus vannamei; Mortality rate Immune response
期刊名称：ECOTOXICOLOGY （ 影响因子：2.935； 五年影响因子：3.272 ）
ISSN： 0963-9292
年卷期： 2022 年 31 卷 9 期
页码：
收录情况： SCI
摘要： Microcystis aeruginosa is reported to cause cyanobacterial blooms in shrimp breeding ponds, which can result in significant shrimp mortality. However, the toxic effects of M. aeruginosa on Litopenaeus vannamei are still not completely understood. In this paper, the toxicity of M. aeruginosa cells to L. vannamei was examined, and the toxic components in the cells were analyzed through high-pressure liquid chromatography (HLPC). In addition, the immune response of shrimp to the M. aeruginosa cell extract was assessed by measuring the activity of immune-related enzymes, as well as the transcription of the relevant genes. The results showed that M. aeruginosa cells, extract and cell-free cultured medium resulted in a 100%, 98.3%, and 1.7% mortality rate in shrimp, respectively. HPLC analysis results revealed the presence of microcystin-LR (MC-LR) at a concentration of 190.40 mg/kg of cells. In addition, the activity and gene transcription of two immune related enzymes, SOD and LZM, were both significantly reduced in shrimp hepatopancreas (p < 0.05) after injection with extract. However, reduced glutathione (GSH) content was slightly increased, but the ratio of GSH to GSSG decreased. The transcription of gst gene function as detoxification, was significantly downregulated (p < 0.05). The results demonstrated that M. aeruginosa cell extract was highly toxic to L. vannamei, and exerted a negative effect on shrimp immunity including reduction of antioxidant capacity, antibacterial activity and detoxification activity, due to toxins including microcystin-LR.
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