Ontogenetic changes in schooling behaviour during larval and early juvenile stages of Pacific bluefin tuna Thunnus orientalis

Abstract

Schooling was first observed at 25–27 days after hatching (26· 2–33· 8 mm, total length) in the Pacific bluefin tuna Thunnus orientalis . At this time, the mode of swimming changed from intermittent sprinting to continuous cruising, and this allowed the fish to adjust to an inertial hydrodynamic environment.

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