Bigeye threshers showed the most striking differences in depth and temperature preferences and all MWBC tests were significantly different among daytime and nighttime comparisons (Figs.
Comparisons of pooled day and night data showed that silky sharks north of 10[degrees]N remained significantly deeper (median = 54 m, mean = 57 m [+ or -] 0.4 SE, interquartile range [IQR] = 22-86 m) than immature silky sharks south of 10[degrees]N (median = 32 m, mean = 32 m [+ or -] 0.3 SE, IQR = 11-48 m) (MWBC, z = -108.9, Monte Carlo P<0.0001).
Comparisons of pooled daytime and nighttime data showed that this individual remained significantly deeper (median=ll3 m, mean=125 m [+ or -] 2 SE, IQR = 91 - 161 m) in warmer water than after it crossed the boundary and entered cooler water (median = 87 m, mean = 90 m [+ or -] 2 SE, IQR = 39-118 m) (MWBC, z = -16.45, Monte Carlo P<0.0001).