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Table 1 Shark summary data

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)

  1. PSATs were attached to sharks A and B, and SPOTS were attached to sharks C–E
  2. F female, M male, SJ small juvenile