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Fig. 2. Yolk-sac volume in day-4 zebrafish larvae exposed to training at 2 BL s–1 and 5 BL s–1. Diamond, starting point; circles, control group; triangles, larvae training at 2 BL s–1; squares, larvae training at 5 BL s–1. An open symbol indicates a value significantly different from the corresponding control value. Values are means ± 1 S.E.M.; N=10 for each group.