Feeding Behavior of Sharks — H obson 
175 
ledges and in caves. The whitetip was common 
to a length of 6 ft, with individuals of 7 ft seen 
on occasion. 
We seldom encountered the blacktip when 
we moved down the slopes from the shallow 
flats into the deeper waters of the lagoon or 
seaward passages, but here we found the grey 
shark in abundance. A census of the shark popu- 
lation of the entire lagoon would probably show 
the grey shark to be the most numerous. This 
shark was commonly seen up to 7 ft in length. 
All three species were generally observed 
swimming close to the bottom unless drawn to- 
ward the surface to feed. 
Figure 5 shows shark sightings by species 
during a period of 30 days in the vicinity of 
Fig. 4. The test area off Bogen Island, showing the relative position of Deep Channel 
(top), raft (at edge of channel), and the barge. The island is out of the picture to the left. 
(Photo by R. A. Boolootian.) 
