From: A dawn peak in the occurrence of ‘knifing behaviour’ in blue sharks
Shark ID | A | B | C | D | E | Mean values (±SD) |
---|---|---|---|---|---|---|
Length of shark (fork length and total length in cm) | 150, 180 | 118, 140 | 167, 205 | 134, 163 | 138, 167 | – |
Sex of shark | F | SJ | M | M | F | – |
Date tagged | 17/9/10 | 7/9/12 | 19/9/12 | 25/9/13 | 25/9/13 | – |
Number of days tracked | 120 | 70 | 212 | 314 | 74 | 200.0 (±120.4) |
Number of days knifing events were recorded | – | – | 162 | 191 | 40 | 131.0 (±80.1) |
% of days knifing events were recorded | – | – | 76.4 | 60.8 | 54.1 | 63.8 (±11.4) |
Number of knifing events recorded | – | – | 807 | 921 | 170 | 632.7 (±404.7) |
Daily rate of knifing events (excl. of days when no knifing events were recorded) | – | – | 5.0 | 4.8 | 4.3 | 4.7 (±0.4) |
Maximum number of knifing events recorded (per day) | – | – | 26 | 13 | 11 | 16.7 (±8.1) |
Longest duration (days) no knifing events were detected | – | – | 9 | 27 | 9 | 15.0 (±10.4) |