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A constrained swimming test showed that at fastest flow speeds, the tail-beat frequencies (TBF) of followers in a school of Japanese chub mackerels were significantly lower than those of the leading fish. The gross cost of transport (GCOT) of schooling fish was 4.8–6.6 J·kg·m, whereas that of solitary swimming fish was significantly larger (9.2–11.5 J·kg·m). To examine the association between the configuration of individuals in the school and energy-saving, the threedimensional positions of individuals in a school were measured in a large tank. Although the school was not arranged in the diamond pattern known to be most effective for energy conservation, the TBF of the followers remarkably decreased when within the range of 1.4 BL (Body Length) from the leading fish in the school. The energy gain of schooling fish was greater than that derived from the potential-theory basis, implying a potential hydrodynamic synergy effect.

Energy-saving in schooling Japanese mackerel (<i>Scomber japonicus</i>) and the effect of induced velocity of wake vortices