FISHERY BULLETIN; VOL. 72, NO. 4 



Table 32. — Food of Chaetodon miliaris. 



Opisthobranch gastropods had been taken by 

 three of the individuals collected at night. Perhaps 

 significantly, these same opisthobranchs are a 

 major prey of C. lunula after dark (see below). 



CONCLUSION. — Chaetodon quadrimaculatus 

 feeds during the day mostly on corals, but also on 

 polychaetes and other benthic organisms. Some 

 nocturnal feeding is likely. 



Chaetodon unimaculatiis Bloch — 

 one-spot butterflyfish 



This chaetodontid is numerous on shallow reefs 

 exposed to a strong surge where the coral 

 Pocillopora is also abundant. Generally occurring 

 in pairs, it is active during the day, picking at the 

 surface of living Pocillopora, and to a lesser extent 

 other reef surfaces. At night it is alert, but appears 

 inactive as it hovers close among cover on the reef. 



Twenty-six specimens (85: 66-102 mm) were 

 speared during night and day. Of three that were 



collected during the 2 h immediately before mid- 

 night, two had empty stomachs, and the third con- 

 tained a few well-digested fragments. Of four 

 collected during the hour immediately before 

 daybreak, two had empty stomachs, and two con- 

 tained only well-digested fragments. Thus, there 

 was no evidence of recent feeding by individuals 

 taken after dark. In contrast, all 19 specimens 

 collected during the day had full stomachs, includ- 

 ing fresh material, as listed in Table 34. 



The major food item, scleractinian corals 

 (mostly Pocillopora), included many skeletal 

 fragments. 



CONCLUSION. — Chaetodon unimaculatus 

 feeds during the day, mostly on the coral 

 Pocillopora. 



Chaetodon multicinctus Garrett — 

 pebbled butterflyfish 



Chaetodon multicinctus is probably the most 

 numerous chaetodontid on Kona reefs in water 



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