Ellis and DeMartmi. Video camera sampling of Pristipomoides filamentosus abundance 



69 



21.6 



21.5 



Figure 1 



Area of operations off Kaneohe Bay, Oahu, for video and longline sur- 

 veys for opakapaka, Pristipomoides filamentosus. Stations for video and 

 longline in 1992 are midpoints identified by solid circles. Area of video 

 coverage in 1993 is enclosed within the dotted lines and stations are 

 midpoints identified by hollow circles. 



ally weighted and buoyed 3-m PVC droppers. Drop- 

 pers were attached along the main line about 18 m 

 apart. A 9.07-kg test, hard monofilament branch 

 leader and a 3.63-kg test, hard monofilament hook 

 leader were used. Each dropper had five leaders with 

 size-12 Izuo circle hooks (AH style), for a total of 

 150 hooks per longline set. Stripped squid was used 

 as bait. The standard soak time was 30 minutes, and 

 three to four sets were completed each day. 



Two separate, 8-mm video camera assemblies were 

 used for the video operations. Each video camera was 

 equipped with a No. 1 diopter magnification lens and 

 a wide angle zoom lens with a red filter for underwa- 



ter correction. Camera focus, sensitivity, and white 

 balance were manually adjusted, but an automatic 

 aperture setting was used. The focus distance for both 

 video cameras was fixed at 2.13 m, and the focal 

 length of the lens was set at 11 mm. Each video cam- 

 era was enclosed in an underwater housing and se- 

 cured in a weighted frame (Fig. 2). A single, 15-cm 

 long bait container was positioned 60 cm in front of 

 the camera lens and mounted on a PVC rod. The bait 

 container held a single (=0.5-kg) mackerel (Scomber 

 sp.) and one whole squid (Loligo sp.) tie-wrapped to 

 the outside, both of which were changed after each 

 deployment. The camera assemblies were manually 



