Abesamis et al . How much does the fishery at Apo Island benefit from spillover from a marine reserve' 



365 



A Hool< and line 



A Northern 

 Apo Island 



X 



Western 

 Apo Island 



Near 

 Apo Reserve 



^ 



Jul Aug Sep Oct Nov Dec Jan Feb 



•S- 600 1 B Gill net 



400  



B 200  



7 ^^RS Ra£.^^ 



Jul Aug Sep Oct Nov Dec Jan Feb 



Aug Sep Oct Nov Dec Jan Feb 



 SW- 



-M INT K- 



NE • 



Month and moonsoon 



Figure 2 



Seasonal trends in fishing effort (left-hand side) and composition of yield (right-hand side) 

 for (A) hook-and-line, (B) gillnet, and (C) spear gun gear used at the three fishing grounds 

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

 monsoon. Species groups: RA=reef associated species, RP=reef planktivores, RS = reef species, 

 OW=open water species, OR = off-reef species. Percentages of dominant species groups are 

 indicated. Legend for graphs at the left-hand side is at the upper right-hand side. 



the western fishing grounds averaged 172 ±62 person 

 hours/month. The total gillnet yield from this area was 

 493 kg (Table 1), dominated by reef species (64%, mainly 

 Scaridae). Gillnet effort near Apo Reserve was much 

 lower compared to other fishing grounds, averaging 78 

 ±27 person hours/month only. However, gillnet effort 

 was relatively high near the reserve in July, October, 

 and November (193, 155, and 157 person hours/month, 

 respectively) (Fig. 2B). The total gillnet yield near the 

 reserve was 318 kg (Table 1), dominated by reef species 

 (63%, mainly Scaridae). 



Gillnet effort did not differ significantly with seasons 

 (ANOVA, F^ jj, = 0.18, P=0.68), but differed significantly 

 among fishing grounds (ANOVA, ^.,,^,=6.72, P=0.007). 

 The season by fishing ground interaction was significant 

 (ANOVA, ^2 18=7-66, P=0.004). During the SW monsoon 

 or interim period (July to October), gillnet effort on 

 the northern fishing grounds was significantly high- 

 er than on the western fishing grounds (Tukey's test. 



q^ jj, = 5.68, P<0.005) and on the fishing grounds near 

 Apo Reserve (Tukey's test, q.^ [8=4.81, P<0.01) but did 

 not differ between the latter two fishing grounds. Dur- 

 ing the NE monsoon (November to February), gillnet 

 effort did not differ between the western and northern 

 fishing grounds, but gillnet effort on the western fishing 

 grounds was significantly higher than near Apo Reserve 

 (<73 18=4.47, P<0.025). Gillnet effort on the northern fish- 

 ing grounds was higher during the SW monsoon and 

 interim period than during the NE monsoon (Tukey's 

 test, 9.^ 18=2.96, P=~0.05 [qo 05 2 i8=2.97]). Conversely, 

 gillnet effort on the western fishing grounds was signifi- 

 cantly higher during the NE monsoon than during the 

 SW monsoon and interim period (Tukey's test, (?, ih= 

 4.67, P<0.005). Gillnet effort near Apo Reserve did not 

 differ significantly between seasons. 



Spear gun fishing Spear fishing occurred mainly on 

 the northern fishing grounds (Fig. 2C). However, spear 



