Spatial and temporal effects of fish feed on antibiotic resistance in coastal aquaculture farms

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Abstract

For the first time, both spatial and temporal effects of fish feed on changes in abundance of antibiotic resistance genes (ARGs) were investigated in South Korea via quantifying ARGs and analyzing physicochemical parameters in the influent (IN) and effluent before (BF) and 30 min after (AF) the fish feeding time of sixteen flow-through fish farms. The absolute abundance of ARGs in AF samples was 5 times higher than in BF and 12 times higher than in IN samples. Values of physicochemical parameters such as ammonia, total nitrogen, suspended solids and turbidity in the effluent significantly increased by 21.6, 4.2, 2.6 and 1.65 times, respectively, after fish feeding. Spatially, the fish farms on Jeju Island exhibited higher relative abundance (3.02 × 10−4 – 6.1 × 10−2) of ARGs compared to the farms in nearby Jeollanam-do (3.4 × 10−5 – 8.3 × 10−3). Seasonally, samples in summer and autumn showed a higher abundance of ARGs than in winter and spring. To assess risk to the food chain as well as public health, further studies are warranted to explore the pathogenic potential of these ARGs.

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Raza, S., Choi, S., Lee, M., Shin, J., Son, H., Wang, J., & Kim, Y. M. (2022). Spatial and temporal effects of fish feed on antibiotic resistance in coastal aquaculture farms. Environmental Research, 212. https://doi.org/10.1016/j.envres.2022.113177

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