Shewanella putrefaciens (S. putrefaciens) is a major spoilage bacterium in aquatic products, capable of forming persistent biofilms that accelerate spoilage and pose potential food safety risks. However, conventional preservation strategies are often ineffective in preventing or removing biofilms. Therefore, there is an urgent need to develop eco-friendly, and safe control strategy. This study aimed to isolate and characterize a novel lytic phage with potent antibiofilm activity against S. putrefaciens and to evaluate its potential as a biocontrol agent in aquatic products. The phage, designated SPuP2, was isolated from commercial clam water and exhibited a short latent period (10 min) and a high burst size (49.95 ± 11.53 PFU/CFU). Genomic analysis revealed that SPuP2 displayed low sequence similarity with previously characterized Shewanella phages, confirming that it represents a novel species. Anti-biofilm efficacy assays demonstrated that SPuP2 significantly inhibited biofilm formation: within 12 h, it reduced the OD595 nm value by 1.15 ± 0.05 (87.06 ± 0.41% inhibition rate) compared to the control. Moreover, it effectively disrupted mature biofilms by reducing extracellular polymeric substances (EPS) and altering cellular structure, achieving a removal rate of 75 ± 0.50%. Furthermore, SPuP2 effectively suppressed the growth of S. putrefaciens in grass carp fillets, resulting in reduced accumulation of spoilage-related substances (e.g., TVB-N, TBARS) and mitigated changes in texture, color, and microstructure, thereby delaying fillet quality deterioration. Overall, this study demonstrates that phage SPuP2 possesses strong antibacterial and antibiofilm activities, offering a promising strategy for controlling Shewanella-mediated spoilage and biofilm contamination in aquatic product biopreservation.
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