Effects of bacteriophage on the quality and shelf life of Paralichthys olivaceus during chilled storage

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Abstract
BACKGROUND: The microbiological spoilage of fishery foods is mainly due to specific spoilage organisms (SSOs), with Shewanella putrefaciens being the SSO of most chilled marine fish. Bacteriophages have shown excellent capability to control micro‐organisms. The aim of this study was to determine a specific bacteriophage to prevent spoilage by reducing SSO (S. putrefaciens) levels in the marine fish Paralichthys olivaceus (olive flounder) under chilled storage.RESULTS: Chilled flounder fillets were inoculated with S. putrefaciens and treated with different concentrations of bacteriophage Spp001 ranging from 104 to 108 plaque‐forming units (pfu) mL−1. Bacterial growth (including total viable count and SSO) of the bacteriophage‐treated groups was significantly inhibited compared with that of the negative control group (P < 0.05). Sensory evaluation and biochemical parameters revealed that the bacteriophage could extend the shelf life of chilled flounder fillets (from 6 and 108 pfu mL−1 were more effective than the chemical preservative potassium sorbate (5 g L−1).CONCLUSION: The bacteriophage Spp001 offered effective biocontrol of S. putrefaciens under chilled conditions, retaining the quality characteristics of spiked fish fillets, and thus could be a potential candidate for use in chilled fish fillet biopreservation. © 2013 Society of Chemical Industry

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