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Composition of norfloxacin-resistant bacteria and isolation of norfloxacin-degrading bacteria in subtropical aquaculture ponds in China

100%

Mao L. , Chen L. , Wang X. , Xu Z. , Ouyang H. , Huang B. , Zhou L.

tom Vol. 48, no. 4

95--101

To analyze the composition of norfloxacin-resistant bacteria and norfloxacin-degrading bacteria in pond water and sediment in subtropical China, the composition of antibiotic resistant bacteria in pond water and sediment enriched with norfloxacin-containing medium was analyzed by high-throughput sequencing. Sediment and water samples were collected from 3 fish ponds in subtropical China, and domesticated with norfloxacin, subsequently norfloxacin-resistant bacteria through high-throughput sequencing of 16S rDNA, and isolated norfloxacin--degrading bacteria. Our results showed that the pond sediment and water contain a variety of norfloxacin-resistant bacteria, mainly from Proteobacteria, Bacteroidetes, Actinobacteria, Firmicutes, and Chloroflexi. Moreover, we isolated two norfloxacin-degrading bacteria (NorXu-2 and NorXu-3). The norfloxacin-degrading rate by NorXu-2 and NorXu-3 in the culture mediums with 200 μg/mL was the highest, which was up to 49.71% and 35.79%, respectively. When the norfloxacin concentration was 200 μg/mL, NorXu-2 and NorXu-3 had the best norfloxacin- -degrading effect at pH of 6, and the degradation rates were 53.64% and 45.54%, respectively. Moreover, NorXu-3 exhibited a good tolerance to high NaCl concentration. These results not only provided basic data for the follow-up study of the molecular mechanism of antimicrobial microbial degradation, but also provided potential norfloxacin degrading bacteria for norfloxacin removal and bioremediation in aquaculture environment.

Tench reproduction and biology in pond culture in Bulgaria

75%

Hubenova-Siderova T. , Grozev G. , Hadjinikolova L. , Grozev G. , Paskaleva E.

nr 1-2

Possibilities and threats in pond production of chosen reophilic Cyprinidae fish species

63%

Ciesla M. , Wojda R. , Sliwinski J. , Mizielinski M. , Ostaszewska T.

2000

tom 27

Seasonal dynamics of occurrence and reproduction of some parasites in four cyprinid fish cultured in ponds. III. Digenea, Cestoda, Crustacea and Hirudinea

51%

Pojmanska T.

tom 40

nr 3

Seasonal changes in prevalence and mean intensity of several parasite species representing four systematic classes, and occurring in four herbivorous fish (common, grass, silver and big head carp) in pond culture were analysed. Frequency of metacercariae of Diplostomum sp. appeared not to be dependent on the season of the year. The seasonal occurrence patterns of two cestode species, Khawia sinensis and Bothrio-cephalus acheilognathi, are described with regard to the process of recruitment of larvae by fish, their maturation and removal of old specimens from fish. Two species of Crustacea (Ergasilus sieboldi and Argulus foliaceus) and two species of Hirudinea (Piscicola geometra and P. pojmanskae) appeared to be most frequent on fish in autumn.