ABSTRACT
Samples of light and dark muscle froin tuna obtained in 1968
and 1969 from the Japanese tuna fishery in the Pacific, and the
same tissues plus liver from tuna from the vicinity of Bikini
Atoll, were analyzed for gamma-emitting radionuclides,
and stable iron.
iron-55
Tuna from the southern hemisphere tended to
have lower concentrations and specific activities than tuna from
the northern hemisphere.
There were no significant trends in the
2
5
tes
+ oa
s
data when
Fe specific activities were compared with species,
month of catch,
location of catch,
or size of fish.
Yhere was
a
.
- 55
ties
tos
.
tay
a close correlation of
Fe specific activity in light muscle,
aoa
dark muscle and liver
muscle end liver.
60
co)
:
,
tained
:
between dark
Yellowfin tuna caught near Bikini Atoll con-
.
.
.
Co believed to be derived
.
close correlation of
liver,
~ 35
.
and of
Fe concentration
60
from the
.
.
atoll.
There was
a
5
Co concentrations between dark muscle and
Cesium-137 concentrations were lower than those reported
for fish from middle and northern latitudes by three to five
O
orders of magnitude.