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Fig. 22. Mutual attraction index reared under four different dietary conditions as (A) oleic acid, (B) EPA, (C) 1/2 DHA, and (D) DHA. Closed circles and open squares represent test and control, respectively (mean ± SE of 30 frames), and asterisks represent a significant difference between test and control (measurement without fish in the neighboring tank) by t-test (*P < 0.05, **P < 0.01). Reproduced with permission from Journal of Fish Biology, 53, Masuda et al., Critical involvement of dietary docosa-hexaenoic acid in the ontogeny of schooling behaviour in the yellowtail. 471­484, Figure 4, © 1998, The Fisheries Society of the British Isles.

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