This work aimed to identify the key members of the bacterial community growing on common carp (Cyprinus carpio) fillets during chilled storage with next-generation sequencing (NGS) and cultivation-dependent methods. Carp fillets were stored for 96 h at 2 °C and 6 °C with and without a vacuum package, and an additional frozen-thawed storage experiment was set for 120 days. Community profiles of the initial and stored fish samples were determined by amplicon sequencing. Conventional microbial methods were used parallelly for the enumeration and cultivation of the dominant members of the microbial community. Cultivated bacteria were identified with 16S rRNA sequencing and the MALDI-TOF MS method. Based on our results, the vacuum package greatly affected the diversity and composition of the forming microbial community, while temperature influenced the cell counts and consequently the microbiological criteria for shelf-life of the examined raw fish product. Next-generation sequencing revealed novel members of the chilled flesh microbiota such as Vagococcus vulneris or Rouxiella chamberiensis in the vacuum-packed samples. With traditional cultivation, 161 bacterial strains were isolated and identified at the species level, but the identified bacteria overlapped with only 45% of the dominant operational taxonomic units (OTUs) revealed by NGS. Next-generation sequencing is a promising and highly reliable tool recommended to reach a higher resolution of the forming microbial community of stored fish products. Knowledge of the initial microbial community of the flesh enables further optimization and development of processing and storage technology.

Department of Aquaculture Institute of Aquaculture and Environmental Safety Hungarian University of Agriculture and Life Sciences 1 Páter Károly 2100 Gödöllő Hungary

Department of Environmental Safety Institute of Aquaculture and Environmental Safety Hungarian University of Agriculture and Life Sciences 1 Páter Károly 2100 Gödöllő Hungary

Department of Environmental Toxicology Institute of Aquaculture and Environmental Safety Hungarian University of Agriculture and Life Sciences 1 Páter Károly 2100 Gödöllő Hungary

Department of Molecular Ecology Institute of Aquaculture and Environmental Safety Hungarian University of Agriculture and Life Sciences 1 Páter Károly 2100 Gödöllő Hungary

WESSLING Hungary Ltd 6 Anonymus 1045 Budapest Hungary

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