Weijerman et al. Trends in biomass of coral reef fishes, derived from creel surveys in Guam 
251 
Appendix t Figure 2 
Comparison of standardized catches of reef fishes between boat-based 
(gray line) and shore-based (black line) spearfishing during 1985-2012, 
based on data from the Guam Division of Aquatic and Wildlife Re- 
sources and the Western Pacific Fisheries Information Network of the 
NOAA Pacific Islands Fisheries Science Center. 
Appendix 2 
Shore-based creei surveys 
For reporting purposes of the shore-based fishery of the 
creel survey program of the Guam Division of Aquatic 
and Wildlife Resources, Guam has been divided into 
93 fishing sites that are grouped into 4 coastal regions 
(Appendix 2 Figure): 
• Region 1 consists of the northwestern portion of 
Guam from Gun Beach to Adelup (sites 1-11) 
• Region 2 consists of the southwestern portion of 
Guam from Adelup to Agat (sites 12-34, excluding 
inaccessible sites 35-41) 
• Region 3 consists of the central-eastern to southern 
portion of Guam from Pago Bay to Merizo (sites 42- 
71, excluding inaccessible sites 57-60) 
• Region 4 consists of the northern part of Guam, and 
access is restricted there because of a military base 
(sites 72-93) 
The staff of the Western Pacific Fisheries Informa- 
tion Network (WPacFIN), NOAA Pacific Islands Fisher- 
ies Science Center, provides assistance with fishery sta- 
tistics to partners at the Guam Division of Aquatic and 
Wildlife Resources and has developed an expansion al- 
gorithm to extrapolate results of the shore-based creel 
surveys into estimates of island-wide catch and effort. 
The shore-based creel surveys have 2 parts, interviews 
of a sample of fishermen and surveys where fishing 
activities were observed and recorded (participation 
surveys). Staff of the WPacFIN estimated annual fish- 
ing effort (measured in gear hours) per gear type per 
region by multiplying the total number of gear hours 
fished, from observations in the participation survey, 
by 2 correction factors 1) the ratio of the number of 
days in a year to the total number of scheduled survey 
days and 2) the number of available fishing hours in 
the morning and in the evening (Bak, footnote 1 in the 
main text). Staff of the WPacFIN estimated total an- 
nual catch per gear per region as the product of total 
annual effort and the gear- and region-specific average 
catch per unit effort (CPUE), the latter derived within 
each stratum as total sampled catch divided by total 
sampled effort. The estimated total catch per species 
within each stratum was calculated by multiplying ag- 
gregate annual catch by the ratio of that particular 
species in the catch from the interviews (Bak 12 ). Miss- 
ing CPUE data was substituted with a moving average 
of the previous 10 years of CPUE data. 
