250 
Fishery Bulletin 1 14(2) 
Appendix 1 
Boat-based and shore-based creel survey data 
Data on both boat- and shore-based fisheries are collect- 
ed during creel surveys conducted by staff of the Guam 
Division of Aquatic and Wildlife Resources (DAWR). 
Boat-based fisheries are focused mainly on trolling 
for pelagic species and bottom fishing for deepwater 
(depths >30 m) species for commercial reasons, and 
shore-based fisheries target shallow-water reef fishes 
for recreational or cultural reasons. Landings of fishes 
associated with shallow (depths <30 m) reefs — the fo- 
cus of this study — accounted for 26% of the total catch 
of fishes for the boat-based fishery from 1985 through 
2012 (based on data from the DAWR boat-based creel 
surveys). In the last 3 years for which complete data 
are available (2010-2012), average annual catches of 
reef fishes from shore-based fisheries were 63 metric 
tons (t), of which reef fish composed 43.5% and big- 
eye scad ( Selar crumenopthalmus ) made up 50.2% (Ap- 
pendix 1 Table). During the same time period, average 
annual catches from boat-based fisheries were 359 t, 
pelagic fishes accounted for 76.4% of the catch composi- 
tion, and reef fishes accounted for 13.1%. 
Although landings of reef fishes from shore-based 
fishing activities accounted for just 37% of the total 
(boat-based and shore-based combined) reef-fish land- 
ings, the shallow-reef fish populations exploited in the 
shore-based fishery potentially are very important for 
subsistence or cultural reasons. Data from interviews 
from the shore-based fishery of the DAWR creel sur- 
vey program revealed that only one fisherman sold 
the catch, on one occasion, during the period from 
1985 through 2012. Because boat-based fisheries ac- 
count for a large amount of reef fish catches, we first 
determined whether the trend in catches of just the 
shore-based fisheries was comparable with the trend in 
catches from the boat-based fisheries of reef fishes and, 
if so, whether the trend would be representative of the 
catches of coral reef fish. 
The majority of the reef fishes captured in the boat- 
based fisheries were caught by spearfishing with snor- 
kel and scuba (Appendix 1 Fig. 1), gear types used in 
both boat-based and shore-based fisheries. We visually 
compared the difference in trends of the standardized 
values of catches between boat-based and shore-based 
spearfishing (Appendix 1 Fig. 2). A Comparison of these 
trends from both fisheries indicates that only in about 
the first 4 years did values differ by 2-4 units but, 
beginning in 1988, values were very similar between 
the fisheries, leading us to conclude that the trends in 
catches reflect common changes in the target stocks as 
well. 
Appendix 1 Table 
Composition of catches from the boat-based and shore- 
based components of the creel survey conducted in 
Guam during 2010-2012. Other=invertebrates and un- 
known species. Data came from the Guam Division of 
Aquatic and Wildlife Resources and the Western Pacific 
Fisheries Information Network of the NOAA Pacific Is- 
lands Fisheries Science Center. 
Boat-based fishery Shore-based fishery 
Species 
Portion 
of 
catch (%) 
Average 
annual 
catch (kg) 
Portion 
of 
catch (%) 
Average 
annual 
catch (kg) 
Reef fishes 
13.1 
47,021 
43.5 
27,465 
Pelagic fishes 
76.4 
274,129 
0.6 
395 
Bottom fishes 
3.3 
11,729 
0.0 
5 
Bigeye scad 
6.9 
24,754 
50.2 
31,714 
Other 
0.3 
947 
5.7 
3614 
Total 
100.0 
358,579 
100.0 
63,193 
BOTTOM FISHINC 
30% 
Appendix 1 Figure I 
Composition of the 5 gear types used most 
in boat-based fisheries to catch reef fishes 
(representing 98% of reef fish catches) dur- 
ing 2000-2005, based on data from the Guam 
Division of Aquatic and Wildlife Resources 
and the Western Pacific Fisheries Information 
Network of the NOAA Pacific Islands Fisher- 
ies Science Center. 
