Aquatic Environment and Biodiversity Annual Review 2012

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5.5. Indicators and trends AEBAR 2012: Non-protected bycatch Population size Multiple species and populations: see Taylor (2000) Population trend Multiple species and populations: see Taylor (2000) Threat status Multiple species and populations: see Miskelly et al. (2008) and updates Number of interactions Trend in interactions In the 2010/11 October fishing year, there were an estimated 4931 seabird captures (excluding cryptic mortalities) across all trawl and longline fisheries (excluding about 14% of bottom longline effort that could not be included in the models) (Data version v20121101). About 57% of the captures were in trawl fisheries, 15% in surface longline fisheries, and 28% in bottom longline fisheries: Bird group Trawl Surface longline 113 Bottom longline All these methods White-capped albatross 356 84 2 442 Other albatrosses 808 287 257 1 352 White-chinned petrel 540 34 422 996 Sooty shearwater 488 2 69 559 Other birds 596 333 652 1 581 All birds combined 2 788 740 1 403 4 931 Captures of all birds combined show a decreasing trend between 2002/03 and 2010/11 (Data version v20121101) but there are substantial differences in trends between species and fisheries. Captures of white-capped albatross have decreased, especially in offshore trawl fisheries, whereas captures of white-chinned petrel have increased: Estimated captures 1400 1200 1000 White-capped albatross 800 BLL 600 SLL 400 200 0 Trawl 2003 2005 2007 2009 2011 1200 1000 800 600 400 200 0 3000 2500 2000 1500 1000 500 0 Sooty shearwater 2003 2005 2007 2009 2011 2003 2005 2007 2009 2011 BLL SLL Other birds Trawl BLL SLL Trawl 2500 2000 1500 1000 500 0 1200 1000 800 600 400 200 0 Other albatrosses 2003 2005 2007 2009 2011 2003 2005 2007 2009 2011 BLL SLL White-chinned petrel Trawl BLL SLL Trawl 8000 7000 6000 All birds combined 5000 4000 BLL 3000 SLL 2000 1000 0 Trawl 2003 2005 2007 2009 2011 Capture rate trends (excluding cryptic mortalities) are described for the four fisheries estimated to account for most of captures of a species (accounting for 80% or more of the total). Capture rates of white-capped albatross have fallen in trawl fisheries for
Trend in interactions contd. AEBAR 2012: Non-protected bycatch hoki and squid but have remained steady in inshore trawl fisheries and increased in the southern bluefin tuna fishery. Capture rates for white-chinned petrel have increased in trawl fisheries for squid and scampi but have remained steady in longline fisheries. Capture rates of sooty shearwater have declined in the ling longline fishery but have fluctuated without trend in other key fisheries. 114
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Aquatic Environment and Biodiversit
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AEBAR 2012 Acknowledgements In addi
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AEBAR 2012 Contents PREFACE .......
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1. INTRODUCTION 1.1. Context and pu
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AEBAR 2012: Introduction Table 1.2:
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AEBAR 2012: Introduction • Impact
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AEBAR 2012: Introduction coastal/co
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AEBAR 2012: Research themes THEME R
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AEBAR 2012: Protected species: THEM
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AE&B Review: Protected species: Sea
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AEBAR 2012: Protected species: Fur
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4.2.2. Distribution AEBAR 2012: Pro
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a b c d e f AEBAR 2012: Protected s
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4.4.4. Sources of uncertainty AEBAR
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4.6. References AEBAR 2012: Protect
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7.3.2. Distribution of Fishing AEBA
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AEBAR 2012: Benthic impacts Baird e
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AEBAR 2012: Benthic impacts Figure
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Area (1000 sq.km) Area (1000 sq.km)
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AEBAR 2012: Benthic impacts changes
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7.3.5. Current research AEBAR 2012:
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7.5. References AEBAR 2012: Benthic
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AEBAR 2012: Benthic impacts Rowden
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AEBAR 2012: Ecosystem effects: Land
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AEBAR 2012: Marine Biodiversity THE
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MPI Research (current) NZ Research
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11.1.2. Defining biodiversity AEBAR
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AEBAR 2012: Marine Biodiversity Mar
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AEBAR 2012: Marine Biodiversity New
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AEBAR 2012: Marine Biodiversity •
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AEBAR 2012: Marine Biodiversity Fig
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AEBAR 2012: Marine Biodiversity 11.
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AEBAR 2012: Marine Biodiversity sta
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AEBAR 2012: Marine Biodiversity to
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AEBAR 2012: Marine Biodiversity ACH
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Progression of research understandi
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AEBAR 2012: Marine Biodiversity and
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AEBAR 2012: Marine Biodiversity Sur
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AEBAR 2012: Marine Biodiversity wor
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AEBAR 2012: Marine Biodiversity dat
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AEBAR 2012: Marine Biodiversity Ove
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AEBAR 2012: Marine Biodiversity 11.
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AEBAR 2012: Marine Biodiversity A n
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AEBAR 2012: Marine Biodiversity mod
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AEBAR 2012: Marine Biodiversity iv)
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11.5. References AEBAR 2012: Marine
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AEBAR 2012: Marine Biodiversity D
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12. Appendices AEBAR 2012: Appendic
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AEBAR 2012: Appendices 14. To advis
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AEBAR 2012: Appendices 12.3. Terms
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AEBAR 2012: Appendices • To devel
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AEBAR 2012: Appendices 12.4. BRAG a
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AEBAR 2012: Appendices 15. While th
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AEBAR 2012: Appendices 39. The over
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AEBAR 2012: Appendices 12.7. OUR ST
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AEBAR 2012: Appendices 12.8.2. Bios
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AEBAR 2012: Appendices Policy 23: D
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AEBAR 2012: Appendices 12.8.7. Nati
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PROTECTED SPECIES AEBAR 2012: Appen
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AEBAR 2012: Appendices: Past projec
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PROTECTED SPECIES continued Project
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AEBAR 2012: Appendices Baird, S., 2
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AEBAR 2012: Appendices Snelder, T.,
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ISBN: 978-0-478-40503-3 (print) ISB
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Aquatic Environment and Biodiversity Annual Review 2012

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