176 
PACIFIC SCIENCE, VoL XVII, April 1963 
Fig. 5. Area in the vicinity of Parry Island, showing the sharks sighted during the 
period 26 July to 26 August, I960, and indicating species involved and depth of water 
where sighting occurred. 
Parry Island and the depth of water in which 
these sightings occurred. Two basic rules were 
observed in making this count: (1) no more 
than one count was made in any one area on 
any one day; (2) if there was any question of 
whether or not a particular shark had already 
been counted on any one day, then this shark 
was disregarded. This survey was not intended 
to show shark abundance, but rather to illus- 
trate the areas and depths in which each of the 
three species was normally seen. 
The distributional picture which emerges is 
consistent with the observations made through- 
out the program. For example, during 2 months 
of work in 15 ft of water off Engebi, only two 
grey sharks, both approximately 2 ft in length, 
were seen. On the other hand, the experiments 
involved many blacktips and whitetips. In con- 
trast, when experiments were conducted along 
the edge of the dropoff into Deep Channel, 
both whitetips and greys were in abundance, 
while blacktips were only occasionally seen. 
