Analysis of the swimming behavior of cultivated Pacific bluefin tuna following a change in environment

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To examine responses to environment changes, we monitored the behavior of cultivated Pacific bluefin tuna in a submerged aquaculture net cage. We confirmed notable changes in the swimming depth of fish when cold water was added to the aquaculture net cage. Additionally, we successfully measured the three dimensional swimming path of the fish. This will enable us to evaluate which factors (i.e., a change in the living space of the submerged net cage by upward or downward movement or a decreased volume caused by ocean currents) affect the behavior of the fish by reconstructing their swimming paths.