Aquatic Environment and Biodiversity Annual Review 2012

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AEBAR 2012: Non-protected bycatch Figure 6.19: Annual estimates of discards in the scampi trawl fishery, for QMS species, non-QMS species, invertebrates (INV), and overall for 1990–91 to 2009–10. Also shown (in grey) are estimates of discards in each category (excluding INV) calculated for 1999–2000 to 2005–06 (Ballara & Anderson 2009). Error bars indicate 95% confidence intervals. The straight lines show the fit of the weighted regression to annual discards. 151
AEBAR 2012: Non-protected bycatch 6.3.9. Tuna longline fishery The New Zealand tuna longline fishery was dominated by the foreign licensed vessels during the 1980s, but is now comprised of chartered Japanese vessels and New Zealand domestic vessels. The domestic fishing fleet has been the dominant fleet in the fishery since 1993–94 (Figure 6.20). Number of hooks (millions) 30.0 25.0 20.0 15.0 10.0 5.0 0.0 1979-80 1980-81 1981-82 1982-83 1983-84 1984-85 1985-86 1986-87 1987-88 1988-89 1989-90 1990-91 1991-92 1992-93 1993-94 1994-95 1995-96 1996-97 Fishing year 1997-98 1998-99 1999-00 2000-01 2001-02 2002-03 N.Z. Domestic Foreign + charter 2003-04 2004-05 2005-06 2006-07 2007-08 2008-09 Figure 6.20: Effort (hooks set) in the tuna longline fishery. Black bars are Foreign and Charter vessels, white bars are NZ domestic vessels. The Japanese charter fleet mainly target southern bluefin tuna off the west coast South island (WCSI), and domestic vessels target mainly southern bluefin tuna and bigeye tuna and the fishery is concentrated on the east coast of the North Island (ECNI) with some fishing for southern Bluefin tuna on the WCSI. The most recent analysis of fish bycatch in tuna longline fisheries was the 2006−07 to 2009−10 fishing years (Griggs & Baird 1012) Observer effort has mainly focused on the Japanese charter vessels (all vessels covered and usually about 80% of hooks observed), with lower coverage of the domestic fishery (approximately 7-8% during 2006−07 to 2009−10). Most of the fishing effort is carried out by the domestic fleet so this fleet is under-observed. During 2006−07 to 2009–10, 111 074 fish and invertebrates from at least 62 species or species groups were observed. Most species were rarely observed, with only 37 species (or species groups) exceeding 100 observations between 1988–89 and 2009–10. The most commonly observed species over all years were blue shark, albacore tuna, and Ray’s bream, these three making up nearly 70% of the catch by numbers. Blue shark and Ray’s bream were the most abundant and second most abundant species in each of the four fishing years 2006–07 to 2009−10 (Table 6.2). Other important non-target species were albacore, lancetfish, bigscale pomfret, dealfish, porbeagle shark, swordfish, moonfish, mako shark, deepwater dogfish, sunfish, and oilfish. The catch composition varied with fleet and area fished. QMS bycatch species are blue sharks, mako sharks, porbeagle sharks, school shark, moonfish, Ray’s bream, and swordfish. Swordfish is also sometimes targeted. 152 2009-10
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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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5.1. Context AEBAR 2012: Protected
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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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Progression of research understandi
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11.5. References AEBAR 2012: Marine
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12. Appendices AEBAR 2012: Appendic
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PROTECTED SPECIES AEBAR 2012: Appen
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PROTECTED SPECIES continued Project
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ISBN: 978-0-478-40503-3 (print) ISB
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