368 



Fishery Bulletin 104(3) 



hook- and-line CPUE and IPUE on the northern and 

 western fishing grounds of Apo Island exhibited little 

 variability (Fig. 4A). For most of the period between July 

 and February, the monthly hook-and-line CPUE on the 



Northern 

 Apo Island 



X 



Western 

 Apo Island 



^ Near 

 Apo Reserve 



Hook and line 



2.0 



15 



Jul Aug Sep 



B Gill net 



Oct Nov Dec Jan Feb 



CL 



X 

 CL 



3 

 Q_ 

 U 



40- 

 3 0. 



Jul Aug Sep Oct 



C Spear gun 



Nov Dec Jan Feb 



Q. 



Aug 

 -SW- 



Sep 



Oct Nov Dec Jan Feb 

 INTw NE 



300 n 

 250 

 200 

 150 

 100 

 50 

 



Aug 



-SW- 



Month and monsoon 



Figure 4 



Monthly mean catch per unit of effort I CPUE) and income per unit of effort (IPUE) 

 for (A) hook-and-line, (B) gill-net, and (C) spear at the three fishing grounds at Apo 

 Island. Seasons: SW=southwest monsoon, INT=calm interim period, NE = northeast 

 monsoon. PHP=Philippine peso. 



northern fishing grounds remained between 0.5 to 0.8 

 kg/person per hour, whereas IPUE remained between 

 30 to 50 PHP/person per hour. Monthly CPUE for the 

 western fishing grounds remained mostly between 0.2 



to 1.0 kg/person per hour, 

 whereas monthly IPUE re- 

 mained mostly between 15 

 to 60 PHP/person per hour. 

 Fishing grounds near 

 Apo Reserve often had the 

 lowest minimum monthly 

 CPUE and IPUE for all fish- 

 ing gears, except for spear 

 gun, which had the lowest 

 minimum monthly CPUE 

 and IPUE on the western 

 fishing grounds (Table 3). 

 However, fishing grounds 

 near Apo Reserve always 

 had the highest maximum 

 monthly CPUE and IPUE 

 for all fishing gears (Table 

 3, Fig. 5). Maximum month- 

 ly CPUE near the reserve 

 was higher by a factor of 

 1.2 to 3.0, depending on 

 the fishing gear and fishing 

 ground (Fig. 5). Maximum 

 monthly IPUE near the re- 

 serve was higher by a factor 

 of 1.6 to 4.3, depending on 

 the fishing gear and fish- 

 ing ground. On the other 

 hand, the highest minimum 

 monthly CPUE and IPUE 

 for all fishing gears were 

 most often found only on the 

 northern fishing grounds of 

 Apo Island (Table 3). 



Spatial patterns of 

 high-value catches 

 among fishing grounds 



Capturing high-value spe- 

 cies and landing a high 

 yield of such species were 

 often more frequent on the 

 northern fishing grounds 

 (Table 4). For example, 133 

 captures of high-value reef- 

 associated species (Caran- 

 gidae — Caranx ignobilis 

 (Forsskal), Caranx melam- 

 pygus (Cuvier), and Caran- 

 goides sp. ) were made on the 

 northern fishing grounds. 

 In 46 of these captures, the 

 yield was aT.O kg or 525 

 PHP. Six of the fishes cap- 



Jul Aug Sep Oct Nov Dec Jan Feb 



Sep Oct Nov Dec Jan Feb 



INT»- 



-NE- 



