Abstract
Vibrio anguillarum kills various kinds of fish over salinities ranging from seawater to freshwater. In this study, we investigated the role of Na + in V. anguillarum, especially under energy-depleted conditions such as in natural seawater. V. angustum S14, which is a typical marine vibrio, was used for comparison. V. anguillarum only required Na + for starvation-survival, but in contrast, V. angustum S14 always required Na + for both growth and starvation-survival. In marine vibrios, Na + is used in the Na +-dependent respiratory chain that produces the sodium motive force (SMF) across the cell membrane. It has been considered that marine vibrios always need a SMF produced by Na +, however in the case of V. anguillarum, the SMF is not required for growth, but becomes more important for starvation-survival.
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