Table S2.

Descriptive statistics, shark bycatch

Variable	Total fishers	Fishers observed*	Observed trips	Observed sets (N)	Shark per set		Shark/1,000 hooks		No. hooks/set
					Mean	SD	Mean	SD	Mean	SD
All fishers	145	120	867	12,062	4.603	5.331	1.996	2.322	2,327.052	409.217
E-A fishers	52	46	371	4,793	4.386	4.982	1.776	2.053	2,492.924	481.605
K-A fishers	24	23	199	2,645	3.847	4.853	1.794	2.209	2,130.047	288.505
V-A fishers†	70	51	297	4,624	5.260	5.843	2.339	2.592	2,267.808	307.597
Network groups, not including outliers
E-A network	51	45	362	4,694	4.365	4.968	1.765	2.047	2,495.662	485.292
K-A network	20	20	172	2,281	3.84	5.034	1.759	2.267	2,158.983	286.927
V-A network†	69	51	297	4,624	5.261	5.843	2.339	2.592	2,267.808	307.597
Outliers
A (E-A, majority K-A)	1	1	9	99	—	—	—	—	—	—
B (K-A, majority E-A)	1	1	7	88	—	—	—	—	—	—
C (K-A, split)	1	1	9	123	—	—	—	—	—	—
D (K-A, majority V-A)	1	1	11	153	—	—	—	—	—	—
E (K-A, majority E-A)	1	0	0	0	—	—	—	—	—	—
F (V-A, majority E-A)	1	0	0	0	—	—	—	—	—	—
G (E-A, majority V-A)	1	0	0	0	—	—	—	—	—	—
Final network groups‡
E-A network	52	45	362	4,694	4.365	4.968	1.764	2.042	2,490.852	482.504
K-A network	23	20	172	2,281	3.84	5.034	1.792	2.251	2,149.052	295.116
V-A network	70	51	297	4,624	5.261	5.843	2.335	2.569	2,256.347	309.418

The bold dashes (—) represent values that are protected by federal law due to confidentiality agreements, which protect all data pertaining to less than three aggregated individuals.

^*Defined as fishers who captained a tuna targeting trip with a NOAA fisheries observer onboard between 2008 and 2012; ∼20% of all tuna trips are observed.

^†Some fishers in this group also participate in swordfish fishing; swordfish trips are not included in this analysis.

^‡In the final network groups, A was included in the K-A network, B was included in the E-A network, and C and D remained in the K-A network (Table 2).