Abstract
Fluoroquinolone antibiotic (FQ) residues in aquaculture ponds are being highlighted around the world because of its high potential threat to environment and human health. This study aimed to apply submerged macrophytes to restore the sediment contaminated by enrofloxacin (ENR) in aquaculture ponds. The results showed that the relative growth rate of Vallisneria spiralis L. was not inhibited when the ENR concentrations in the sediment varied at 0.5, 1.0 and 5.0 mg/kg DW. Low ENR concentrations (0.5 and 1.0 mg/kg DW) promoted the elongation growth, N and P accumulation of V. spiralis, but high concentration (5.0 mg/kg DW) inhibited the root elongation and N and P accumulation of leaves. Meanwhile, the ENR removal efficiencies were 74.7%, 32.3% and 60.0% at the above mentioned three concentrations, respectively. 45.6% and 70.4% of the CIP were eliminated from the sediment with ENR concentrations of 1.0 and 5.0 mg/kg DW. Under the influence of V. spiralis and FQs, the microbial diversity of the sediment samples was greatly influenced by ENR, but affected little by its concentration. ENR and ciprofloxacin (CIP) caused a clear increase in the abundance of Acidobacteria, Planctomycetia and Verrucomicrobia, while suppressing the abundance of Chloroflexi, Bacteroidetes and Actinobacteria. As a result, submerged macrophytes showed great potential in restoring the aquaculture ponds with FQ residues.
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