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Levels of plasma cortisol increased 15 min after exposure to simulated predation risk and subsided by 60 min after exposure. Fish that were in a group consistently had lower plasma cortisol than fish that were alone. n = 28–30 individuals per bar. Data represent least squares (LS) means ± 1 standard error of raw (not transformed) data. LS-means with the same letter are not significantly different.
