Table 1.
Summary of sample sizes for (a) study components considering both seabird captures during setting and hauling, and (b) a standardized catch model for live seabirds, which considered seabird captures during hauling.
Figure 1.
Percent of annual observed captures of Laysan (LAAL) and black-footed albatrosses (BFAL) that were alive at retrieval, Hawaii longline swordfish fishery, 2004–2012.
Data labels are total number of LAAL or BFAL observed captured in that year.
Figure 2.
Frequency that the specified number of live seabird capture events occurred per set, Hawaii longline swordfish fishery, 2004–2012.
Data labels are number of sets. Not shown, there were 11,693 sets with 0 seabird captures.
Figure 3.
Number of live seabirds observed captured per number of shallow-set hooks set, for 49 Hawaii longline swordfish vessels, 4 May 2004 - 11 October 2012.
Solid line is mean live seabird CPUE of 0.028 live birds per 1000 hooks. Outliers with relatively high and low nominal catch rates for live seabirds are identified within the rectangle and oval, respectively, per rules defined in Results section “Nominal Total and Live Seabird Catch Rate by Unique Vessel”.
Table 2.
GAMM and GAM-equivalent standardized catch rate model for live seabirds fits to the Hawaii longline swordfish fishery observer program dataset.
Figure 4.
Generalized additive mixed Poisson regression model (GAMM) fitted to live seabird catch in hauls made by the Hawaii longline swordfish fishery (N = 11,385 hauls), 4 May 2004 - 11 October 2012.
The GAMM explicitly accounts for the effects on the standardized catch rate model for live seabirds of: (A) year, (B) month, (C) haul duration, (D) mean albatross density during hauling, (E) mean value of the Beaufort scale during hauling, (F) amount of the weighted swivel on the branchline, (G) distance between the weighted swivel and hook, (H) branchline length, (I) vessels with low, average, or high nominal live seabird catch rates, (J) untreated vs. blue-dyed fish bait, and (K) two-dimensional spatial (setting location).
Figure 5.
Mean albatross density (mean number of Laysan and black-footed albatrosses within 137 m of the fishing vessel) during hauling by month, Hawaii longline swordfish fishery, May, 2004 - October, 2012.