Effects of epigallocatechin gallate on microbial communities of rainbow trout fillets during ice storage and identification of biogenic amines-producing bacteria

Biogenic amines-producing bacteria were isolated from rainbow trout fillets and their biogenic amines production ability was investigated. The effects of epigallocatechin gallate (EGCG) on the microbial communities of rainbow trout fillets were also investigated. Fifteen (15) strains of biogenic amines-producing bacteria were isolated from rainbow trout fillets. Pseudomonas psychrophila and Shewanella baltica produced putrescine (73.97 mg/mL) and histamine (48.66 mg/mL), respectively. The high-throughput sequencing results indicated Proteobacteria were the dominant phyla of the both control group and the EGCG treated groups. At the genus level, Shewanella spp. and Pseudomonas spp. were the dominating bacteria in the control group, while Pseudomonas spp. were the dominant bacteria in the EGCG treated groups. EGCG can obviously decrease bacterial diversity of rainbow trout fillets, which was mainly reflected in the relative abundance of Shewanella spp. This study provides microbial insights into controlling the quality of rainbow trout fillets during ice storage.