55
The frequency distribution of the specific activity of ~ Fe
in tuna caught north of the equator and of tuna caught scuth of
the equator in 1967 and 1968,
single school,
and in tuna, presumably from a
caught at approximately 11°N in dune 1969 are.
shown in Figure 1.
The distributions have a strong positive
skewness, With a definite tendency for a greater proportion of
higher specific activities in tuna caught north of the equator.
The tuna presumed to be from a single school off Bikini Atoll
show a
Similar frequency distribution,
although the range of
specific activity values was less than in the other groups.
Attempts were made to correlate various parameters such as
species,
55
Fe
tf
month of catch,
.
i
lecation of
tos
concentrations or
specific
catch,
a
ae
activities;
and size of fish with
however,
.
toes
no signifi-
cant relationships were found other than the tendency for fish
.
-
caught north of the equator to have higher concentrations of
55 Fe
and higher specific activities than fish caught south of the
equator.
-
1.
29
Values at the extremes of the ranges for both
Fe con-
centration and specific activity, were found in tuna caught near
the equator,
8°N for example,
and in tuna caught at 39°N.
.
x
55
.
tes
Results of comparisons made of the
Fe content and specific
activities of the light muscle,
dark muscle,
and liver from the
sixteen yellowfin tuna cavght off Bikini are given in Table 1.
Log
55
Lice
ates
.
c
Clearly, determination of
Fe specific activity in any of the
wre
gar ARO