~ 14 Table 5. Tissue Iron-55 (Fe>>) in each of thirteen tissues from one skipjack tuna. * Picocuries/gm. (wet) Tissue + 95% counting error Gill 9.8 + 0.6 Spleen 7.8 + 1.8 Kidney 7.4 + 0.5 Heart 5.1 + 0.5 Bone 4.3 +t 0.6 Pyloric caeca 4.0 + 0.2 Intestine 3.4 + 0.3 Gonad 2.2 + 0.2 Stomach 2.1 + 0.5 Liver 1.8 + 0,4 Muscle, dark 0.8 + 0.1 Muscle, light 0.3 + 0.1 Skin * Sample M-2. 0.0 Fish was caught between April 20 and May 21, in the area bordered by 24°-27° N and 157°-160° W. sampled was June 12, 1962. Date 1962

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