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This study was conducted to clarify the diŠerence in discoloration proˆle of the dark muscle of cultured yellowtail Seriola quinqueradiata and amberjack Seriola dumerili during chilled storage. Discoloration of dark muscle was observed in yellowtail after storage for 24 h at 5°C, whereas no discoloration was observed in amberjack. The ratio of metmyoglobin (metMb) to total myoglobin (Mb) gradually increased in the dark muscle of both ˆsh during storage, although it was higher in yellowtail than in amberjack. The pH of yellowtail dark muscle (pH 6.6) was lower than that of amberjack (pH 6.9). Similarly, the pH of yellowtail ordinary muscle (pH 6.0) was lower than that of amberjack (pH 6.1). Discoloration of the dark muscle of yellowtail initially appeared near the boundary between dark muscle and ordinary muscle. In crude Mb solutions prepared from the dark muscle of yellowtail and amberjack, the ratio of metMb to total Mb gradually increased during incubation at 25°C, and in both ˆsh, this increase was accelerated by a decrease in pH from 7.0 to 6.0. These results indicate that a diŠerence in the pH values of the dark and ordinary muscles of yellowtail and amberjack aŠects the diŠerence in discoloration proˆle of dark muscle between these ˆsh during chilled storage.

Comparison of discoloration of dark muscle between cultured yellowtail Seriola quinqueradiata and amberjack Seriola dumerili during chilled storage