Aquatic Environment and Biodiversity Annual Review 2012

AE&B Review: Protected species: Sea lions
Table 3.4a: Effort, observed and estimated NZ sea lion captures in trawl fisheries by fishing year in the New Zealand EEZ (http://data.dragonfly.co.nz/psc/). For each fishing year,
the table gives the the total number of tows; the observer coverage (the percentage of tows that were observed); the number of observed captures (both dead and alive); the capture
rate (captures per hundred tows); the estimation method used (model, ratio or both combined); the mean number of estimated total captures (with 95% confidence interval); the
mean number of estimated total interactions (with 95% confidence interval), and the stike rate (interactions per hundred tows). For more information on the methods used to
prepare the data, see Thompson et al. (2012).
Fishing year Fishing effort
Observed captures
28
Estimated captures
Estimated interations
Estimatedstrike rate
All effort % obs Number Rate Method Mean 95% c.i. Mean 95% c.i. Mean 95% c.i.
Trawl fisheries
1995–96 10 081 10
16 1.5
Both 148 85–242
148 85–243
1.5 0.8–2.4
1996–97 10 941 15
28 1.7
Both 155 104–221
155 102–225
1.4 0.9–2.1
1997–98 9 964 14
14 1.0
Both 76 47–119
76 45–121
0.8 0.5–1.2
1998–99 10 551 16
6 0.4
Both 33 20–49
33 19–50
0.3 0.2–0.5
1999–00 9 043 22
28 1.4
Both 88 63–129
89 59–130
1.0 0.7–1.4
2000–01 8 910 40
46 1.3
Both 61 52–72
83 59–111
0.9 0.7–1.2
2001–02 9 945 19
23 1.2
Both 64 46–88
94 61–139
0.9 0.6–1.4
2002–03 8 308 19
11 0.7
Both 34 22–48
62 37–97
0.7 0.4–1.2
2003–04 10 033 23
21 0.9
Both 61 43–85
214 120–376
2.1 1.2–3.7
2004–05 11 109 23
14 0.5
Both 53 36–77
181 94–325
1.6 0.8–2.9
2005–06 9 316 21
14 0.7
Both 52 35–75
174 86–334
1.9 0.9–3.6
2006–07 6 728 24
15 0.9
Both 47 32–66
118 59–235
1.8 0.9–3.5
2007–08 6 545 33
8 0.4
Both 29 18–42
118 35–418
1.8 0.5–6.4
2008–09 6 677 27
3 0.2
Both 22 12–36
103 25–383
1.5 0.4–5.7
2009–10 5 541 34
15 0.8
Both 46 32–66
141 51–439
2.5 0.9–7.9
2010–11 6 389 31 6 0.3 Both 29 17–43
81 26–259
1.3 0.4–4.1
Auckland Islands squid
1995–96 4 467 12
13 2.4
Model 131 69–226
131 67–224
2.9 1.6–5.0
1996–97 3 716 19
28 3.9
Model 142 91–208
142 89–210
3.8 2.6–5.5
1997–98 1 441 22
13 4.2
Model 60 33–102
60 31–104
4.2 2.5–6.9
1998–99 402 38
5 3.2
Model 14 5–27
15 5–29
3.6 2.1–5.9
1999–00 1 206 36
25 5.7
Model 69 45–107
69 42–108
5.8 4.0–8.6
2000–01 583 99
39 6.7
Model 39 39–40
61 39–87
10.4 8.6–13.1
2001–02* 1 648 34
21 3.7
Model 43 30–64
73 43–116
4.4 3.0–6.6
2002–03 1 470 29
11 2.6
Model 19 13–29
48 24–81
3.2 2.0–5.1
2003–04 2 594 30
16 2.0
Model 41 26–62
194 100–356
7.5 4.0–13.5
2004–05^ 2 706 30
9 1.1
Model 31 17–51
159 73–303
5.9 2.7–11.1
2005–06 2 462 28
9 1.3
Model 28 15–45
149 62–308
6.0 2.7–12.5
2006–07 1 320 41
7 1.3
Model 16 9–27
87 29–201
6.6 2.3–14.8
2007–08 1 265 46
5 0.9
Model 12 6–21
101 19–396
8.0 1.6–30.9
2008–09 1 925 40
2 0.3
Model 8 3–17
89 12–365
4.6 0.7–18.4
2009–10 1 190 25
3 1.0
Model 13 5–27
107 18–402
9.0 1.7–33.6
2010–11 1 586 34 0 – Model 4 0–11
56 4–233
3.5 0.4–14.9
* SLEDs introduced. ^ SLEDs standardised and in widespread use.