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This study investigates the physicochemical changes and water migration of  Acinetobacter johnsonii  (A),  Shewanella putrefaciens  (S), and cocultured  A. johnsonii  and  S. putrefaciens  (AS) inoculated into bigeye tuna during cold storage. The physicochemical indexes [fluorescence ratio (FR), total volatile base nitrogen (TVB-N), thiobarbituric acid (TBA), trimethylamine (TMA), peroxide value (POV), and pH] of bigeye tuna increased cold storage. A significant decrease in trapped water was found in the AS samples, and direct monitoring of the water dynamics was provided by low-field nuclear magnetic resonance. Samples inoculated with  A. johnsonii  and  S. putrefaciens  also induced the degradation of myofibrillar proteins and weakness of some Z-lines and M-lines. Higher values of physicochemical indexes and water dynamics were shown in the coculture of  S. putrefaciens  and  A. johnsonii  than in the other groups. Therefore, this paper reveals that the coculture of  A. johnsonii  and  S. putrefaciens  resulted in a bigeye tuna that was more easily spoiled when compared to the single culture. This study provides insight into the spoilage potential of  A. johnsonii  and  S. putrefaciens  during cold storage, which further assists in the application of appropriate technologies to keep the freshness of aquatic foods.

frontiers in microbiology

Comparison of Physicochemical Changes and Water Migration of Acinetobacter johnsonii, Shewanella putrefaciens, and Cocultures From Spoiled Bigeye Tuna (Thunnus obesus) During Cold Storage