Ecological effects of erythromycin thiocyanate on inhibiting cyanobacteria in situ

doi:10.16535/j.cnki.dlhyxb.2019-113

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Journal of Dalian Fisheries University ›› 2020, Vol. 35 ›› Issue (2) : 260-265. DOI: 10.16535/j.cnki.dlhyxb.2019-113

Ecological effects of erythromycin thiocyanate on inhibiting cyanobacteria in situ

WANG Xueying1, BI Xiangdong1*, DONG Shaojie1, YOU Hongzheng2, LIU Keming2, DAI Wei1, LI Wanjin1

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Abstract

Erythromycin thiocyanate was added into 15 cylindrical bottom sediment enclosures made of high density impermeable canvas and stainless steel iron frame in an circulating water channel with frequent cyanobacterial bloom outbreak at a dose of 0(control group), 0.25, 0.5, 1 mg/L and 2 mg/L for 10 days to clarify the dynamic changes in cyanobacteria and Microcysis abundance, microcystin(MCs)content in sediment and key hydrochemical indicators under the action of algaecide agent.The erythromycin thiocyanate was shown to have very strong inhibitory effect in cyanobacteria and Microcysis in the ecological enclosure, with inhibitory rate of 99% at the end of experiment.There was increase in content of microcystin in sedimentt first and then decrease under the action of erythromycin thiocyanate, with the maximum MC-RR content of 2.58 μg/g and MC-LR of 3.39 μg/g at the second 2 d.The increase in contents of

and CODMn was observed to some extent in a short time after emergency controlling of cyanobacteria bloom by erythromycin thiocyanate, especially the content of

and CODMn.Considering the algaecide effect, MCs storage in sediment and the change rule of key hydrochemical indices, it is recommend that erythromycin thiocyanate be applied at a dose of 0.25 mg/L to control cyanobacteria bloom in emergency, accompanied by operating aerators, and administration of probiotics in aquaculture.

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erythromycin thiocyanate / cyanobacteria / microcystin / ecological effect

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WANG Xueying, BI Xiangdong, DONG Shaojie, YOU Hongzheng, LIU Keming, DAI Wei, LI Wanjin. Ecological effects of erythromycin thiocyanate on inhibiting cyanobacteria in situ[J]. Journal of Dalian Fisheries University, 2020, 35(2): 260-265 https://doi.org/10.16535/j.cnki.dlhyxb.2019-113