138 
Fishery Bulletin 95( 1 ), 1997 
(Moffitt and Parrish, 1996). Sonic tracks of these ju- 
veniles indicate a discrete and limited individual 
home range of 140 m average diameter, suggesting 
that the locations of these juvenile aggregations could 
be very stable. Why juvenile aggregations appear 
spatially stable and how common they are in the rest 
of the archipelago are the primary focus of this work. 
Methods 
Survey of the east Oahu study site 
The east Oahu study site contains three submarine 
canyons. Two of the canyons are located just outside 
Kaneohe Bay, north of Mokapu Point, and the third 
is located south of Mokapu Point just outside Kailua 
Bay (Fig. 1, II). Throughout this paper, the three areas 
will be referred to as the “north Kaneohe,” “south 
Kaneohe,” and “Kailua” canyons. Positional data from 
a Global Positioning System (GPS) were entered and 
manipulated in a raster-based Geographic Information 
System (GISXIDRISI 4.0 version) (Eastman, 1992). 
Video index of snapper abundance 
A baited video camera (Fig. 2) was selected as the 
primary gear because it provided information on the 
abundance of snappers and their associated habitat 
type. In each video drop, the baited camera was 
placed on the bottom for 10 minutes, where it 
attracted juvenile snappers in front of the camera 
lens; the maximum number of snappers seen in a 
single image was used as the index of abundance. 
Consecutively deployed video drops were separated 
by 1,200 m to avoid attraction of fish from previous 
drops. A description of equipment, method, and vali- 
dation of the technique for creating a video index of 
snapper abundance is provided by Ellis and DeMar- 
tini (1995). 
Selected video stations at the study site were rep- 
licated to determine the suitability of unreplicated 
spatial data for subsequent use in evaluating the 
persistence of snapper patches over time. Nineteen 
stations, resampled after 10 days, were used to rep- 
resent all 3 canyons during February-March 1994. 
These stations were termed “multicanyon stations.” 
Figure 1 
(I) - Map of the Hawaiian Archipelago with video survey sites denoted as 1 = Kailua-Oahu, 
2 = Kaneohe-Oahu, 3 = south Molokai, 4 = Hanalei-Kauai, 5 = Kahului-Maui, 6 = north 
Molokai, and 7 = French Frigate Shoals in the Northwestern Hawaiian Islands. (II) Loca- 
tions of the three east Oahu areas studied, including north Kaneohe canyon (A), south 
Kaneohe canyon (B), and Kailua canyon (C). Also represented are the sources of coastal 
drainage of north Kaneohe channel (a), south Kaneohe channel (b), and the Kailua waste- 
water outfall (c). 
