Fig. 1. Survival of zebrafish yolk-sac larvae (day 4), swim-up larvae (day 9), and free-swimming larvae (day 21), at the conclusion of a training period. Circles, control group; triangles, larvae training at 2 BL s^–1; squares, larvae training at 5 BL s^–1. Open symbols indicate a value significantly different from the corresponding control value. Values are means ± 1 S.E.M.; N=120 for each treatment group at the beginning of the treatment.