Summary of daytime and nighttime swimming behaviour.

<p>*Prickly shark mean swimming speed was below the accelerometer speed sensor stall speed of 0.1–0.2 m s^-1.</p><p>^†The accelerometer speed sensor on the 450-cm sixgill shark stopped 5 hours after release, so the swimming speed of this individual for the remainder of the deployment was estimated from tailbeat frequency using the relationship between tailbeat frequency and swimming speed recorded during the first 5 hours.</p><p>Summary of daytime and nighttime swimming behaviour.