Aquatic Environment and Biodiversity Annual Review 2012

AEBAR 2012: Non-protected bycatch
Figure 6.2: Annual estimates of bycatch in the arrow squid trawl fishery, for QMS species, non-QMS
species, invertebrates (INV), and overall for 1990–91 to 2010–11. Also shown (in grey) are estimates of
bycatch in each category (excluding INV) calculated for 1999–2000 to 2005–06 (Ballara & Anderson
2009). Error bars indicate 95% confidence intervals. The red lines show the fit of a locally-weighted
polynomial regression to annual bycatch. In the bottom panel the solid black line shows the total annual
reported trawl-caught landings of arrow squid (Ministry of Fisheries 2011), with circles indicating years
in which the fishery closed early after reaching the sea lion FRML; and the dashed line shows annual
effort (scaled to have mean equal to that of total bycatch).
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