
TY  - JOUR
A1  - Maypa, A. P. 
A1  - Russ, G. R. 
A1  - Alcala, A. C. 
A1  - Calumpong, H. P. 
T1  - Long-term trends in yield and catch rates of the coral reef fishery at Apo Island, central Philippines
JF  - Marine and Freshwater Research
JO  - Mar. Freshwater Res.
Y1  - 2002
VL  - 53
IS  - 2
SP  - 207
EP  - 213
KW  - 
UR  - https://doi.org/10.1071/MF01134 
N2  - Fish yields and catch rates recorded in the 1980s were compared with daily roving creel surveys carried out in 1997/98, 2000 and 2001 at Apo Island. Total annual fish yields were measured six times over the period 1980&#8211;2001. Total fish yield was 19&#8211;25 t km&#8211;2 year&#8211;1, with reef and reef-associated fish accounting for 15&#8211;20 t km&#8211;2 year&#8211;1, for five measurements. A sixth measurement, made in 1986, estimated 36.7 t km&#8211;2 year&#8211;1. Annual yield remained stable over the study period. Carangidae and Acanthuridae accounted for 26&#8211;47% and 16&#8211;27% of the catch, respectively. Non-reef catches declined over time, from 6.21 t year&#8211;1 in 1980/81 to 1&#8211;2 t year&#8211;1 in 2000 and 2001. Estimates of annual hook and line catch per unit effort (CPUE) increased from 0.13&#8211;0.17 kg man&#8211;1 h&#8211;1 in 1980/81, to 1&#8211;2 kg man&#8211;1 h&#8211;1 in 1997&#8211;2001. For target families, hook and line CPUE was consistently higher in 1997&#8211;2001 than in 1980&#8211;86. However, hook and line CPUE for Carangidae and Acanthuridae declined significantly between 1997 and 2001. Possible reasons for the long-term patterns of fish yields and catch rates are discussed. Differences in methods used in estimates, and changes in gears and fishing effort over the years, make comparisons difficult. 
ER  -

