11 laboratory experiment which shows that 957, is poorly metabolized (Po 66). Since less than a month elapsed between the time the 957, was introduced to the environment and the time the fish were caught, and in view of the i £ apparent low metabolism o ey, it is reasonable to assume that most of the 957, measured in the viscera sample is associated with the intestinal contents. If so, this data could be used to estimate the amount of the intestinal contents in the viscera sample which in turn allows us to estimate the concentration of plutonium associated with the internal organs associated with the disected viscera sample. We first calculate the amount of the contents in the GIT using the 9975 specific activity of the separated stomach contents. separated from the 18 fish, total 95 Of the 638 dry grams of viscera sample 326 grams of the material could account for the Zr measured in the viscera. The weight of the viscera without the computed gut contents is then 312 dry grams and has a wet/dry weight ratio of 4.39. The viscera plus computed gut ccntents contained a total of 2.92 pCi of 23942405, 326 dry grams of contents at 5.00 pCi/kg (stomach content concentration) should contain 1.63 pCi of 239+240 Pu leaving 1.29 pCi of plutonium associated with the viscera tissues and organs. 239+240, u associated only with the wet viscera is then estimated from the above arguments to be 0.94 pCi/kg. This comparative analysis shows that a significant fraction of the plutonium measured in unseparated "viscera" Sample is associated with the contents in the GI tract. Although the muscle and gill samples of the mullet were lost during processing, the concentration of plutonium can be estimated from other data. An extensive analysis was recently completed to assess plutonium and