Aquatic Environment and Biodiversity Annual Review 2012

AEBAR 2012: Protected species: Sea lions
Table 3.4b: 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 or per thousand hooks); the estimation method used (model, ratio
or both combined); and the mean number of estimated total captures (with 95% confidence interval). For more
information on the methods used to prepare the data, see Thompson et al. (2012).
Fishing year Fishing effort Observed captures Estimated captures
All effort % obs Number Rate Method Mean 95% c.i.
Auckland Islands scampi
1995-96 1 303 5
2 3.2
Ratio 11 4–19
1996-97 1 222 15
0 -
Ratio 7 2–15
1997-98 1 107 11
0 -
Ratio 7 1–15
1998-99 1 254 2
0 -
Ratio 9 2–18
1999-00 1 383 5
0 -
Ratio 9 3–18
2000-01 1 417 6
4 4.8
Ratio 14 7–23
2001-02 1 604 9
0 -
Ratio 10 3–20
2002-03 1 351 11
0 -
Ratio 9 2–17
2003-04 1 363 12
3 1.8
Ratio 12 5–20
2004-05 1 275 0
NA NA
Ratio 9 3–18
2005-06 1 331 9
1 0.9
Ratio 10 3–18
2006-07 1 328 7
1 1.1
Ratio 10 4–19
2007-08 1 327 7
0 -
Ratio 9 2–18
2008-09 1 457 4
1 1.6
Ratio 11 4–21
2009-10 940 10
0 -
Ratio 6 1–13
2010-11
Auckland Islands other
1 401 15 0 - Ratio 9 2–17
1995-96 405 6
1 4.0
Ratio 3 1–6
1996-97 296 4
0 -
Ratio 1 0–4
1997-98 684 17
1 0.9
Ratio 3 1–8
1998-99 525 10
1 1.8
Ratio 3 1–7
1999-00 750 13
0 -
Ratio 3 0–8
2000-01 577 7
0 -
Ratio 2 0–7
2001-02 589 4
0 -
Ratio 2 0–7
2002-03 543 13
0 -
Ratio 2 0–7
2003-04 289 17
0 -
Ratio 1 0–4
2004-05 170 7
0 -
Ratio 1 0–3
2005-06 39 15
0 -
Ratio 0 0–1
2006-07 38 5
0 -
Ratio 0 0–1
2007-08 147 45
0 -
Ratio 0 0–2
2008-09 121 50
0 -
Ratio 0 0–2
2009-10 77 66
0 -
Ratio 0 0–1
2010-11 131 37 0 - Ratio 0 0–2
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