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PACIFIC SCIENCE, VoL XIII, October, 1959 
per month for skipjack of this size (from his 
hg. 2). If the fish was of average size (i.e., 
7 pounds) at the time of release, then a 
growth of 0.8 pound per month is indicated, 
which is slightly more than one-half the 
growth of 1.4 pounds per month shown by 
Brock. Einally, if the fish was at the upper 
limit of the size range (i.e., 9-5 pounds), it 
grew at the rate of 0.5 pound per month, or 
one-third the rate of growth of 1.5 pounds per 
month indicated by Brock. 
Predation: There was evidence that some 
loss of tagged skipjack resulted from preda- 
tion. Two tagged skipjack and one tag were 
recovered through incidental examination of 
stomachs of large tuna caught by longline 
near the island of Hawaii (recoveries 5, 7, 8 in 
Table 1). All three skipjack weighed about 
4 pounds and were recovered within a few 
days of release. They were the only recoveries 
of skipjack released in that area. 
In order to determine the incidence of 
skipjack, tagged or untagged, in the stomachs 
of larger fish, a sampling program at the 
