The accuracy and precision of underwater measurements of length and maximum body depth of southern bluefin tuna (Thunnus maccoyii) with a stereo-video camera system

摘要

The accuracy and precision of in situ stereo-video measurements of the snout to fork length (SNFL) (range 830-1412 mm) and maximum body depth (MBD) (range 228-365 mm) of free-swimming southern bluefin tuna (SBT) (Thunnus maccoyii) were tested by filming live fish in sea cages immediately prior to harvest. Stereo-video measurements of the SNFL of 54 fish produced an average error of 1.72 mm (relative error of 0.16%), while an average error of 1.37 mm (relative error of 0.51%) was recorded for measurements of MBD from 47 fish.