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Fig. 17. Development of (A) separation angle, (B) nearest neighbor distance (NND) in absolute value (black circles, left Y axis) and NND­TL ration (white circles, right Y axis), (C) mutual attraction (black circles: fish in neighboring tank, white square: no fish in neighboring tank) and (D) association with flotsam. Lines in (A) and (C) represent the value expected in random orientation and position, respectively. In (A) and (B) difference among stages were compared by Student's t-test, and in (C) and (D) tests and controls were compared by t-test. NS, not significant; *P < 0.05; **P < 0.01. Redrawn with permission after Journal of Fish Biology, 52, Masuda and Tsukamoto. The ontogeny of schooling behaviour in the striped jack. 483­493, Figure 2, © 1998, The Fisheries Society of the British Isles.

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