21,621.3] 4 14147 |? * 8 r" om peak" 22,0 il 37.3 41,9] 423.22 3,9 11848 1e “upswing” a Mine + value is 1 o counting error, When the counting error is >100%, the concentration is reported as <2 0, 85 2,841.6 244 £12; 58.4 9.37 40,17 32 4.542.4 145 #9 16.4 2.27 0,81 <5.9 196 # 12) A3 0.6+9,32 25,8 41.5 64 61 20,90 10446 >33 5.0+2,0 2385) 3 nd 524 war Fish collected below the effluent discharge pipe show a substantial Wn 1. 190 +11) CONCLUSIONS 100 we can offer no sure explanation. 0.37 £0.26 The >94-mm size class from sample A, how- “before” surface area per unit weight. ever, does not fit the pattem suggesting some other factor to be more : important than surface area or perhaps indicating some sampling problem, Because sample A was the only one to have thts largest size class, and it was not subdivided into the smaller size classes comparable to sample D, A 238py concentrations appear to be dependent on size, possibly related to surface area of the shell and gills: i.e., smaller organisms have a greater L If one examines the length distribution data (Table 5) from sample D the 238/3e 24905 discrepancy in our data, Wreele The data also show a concentration of 239, 240by, again most apparent in soft tissues, above levels determined in other samples collected at the same site (Table 3) at different times. We can offer no explanation for this T 4 < 38, 239,240, Pu activity in the shell. | Sample 14s present for (a) 2385 and 239,240), ¢fCl/g Gry wt) tissue (Noshkin, 1972; Aarkrog, 1971; Ward, 1966). No discernable pattern Distribution o £ the viscera. Results from other studies, however, have shown shell or skeletal portions of animals te have higher levels of plutonium than soft 4, that highest plutonium concentrations in clams and lobsters were found in ” nw! 125 le The 238py concentration in whole crayfish increases somewhat during the pulse (Table 4), apparently due to uptake by soft tissue. In all cases, concentrations of 238py are much higher in soft tissue than in the shell agreeing with the findings of Nelson and Noshkin (1973). They reported h ¢. rayfish. point of the rostrum. An additional larger size class (>94 mm) was found only in the A collection and it is also included in Table 5, Shell 239,240, 238,29972405, a o 3B Crayfish were analyzed whole or as shell and tissue portions, The shell portion included the thoracic carapace, chelae, pleopods, periopods, abdominal segments, uropod and telson, All shell portions were scraped clean of membranes, viscera, and tissue. Sample D was subdivided into four classes (Table 5) by length measured from the tip of the telson to the 37,.021,9| in dye concentration (D); and after the pulse had passed the site (EF). ll downstream from its release point. Samples were collected before the pulse arrived (A); on the upswing (B); during the peak (C); during the downswing )7,.31 21.76 (Sprugel et al,, 1975). The dye concentration in the Great Miami River was monitored using a fluorometer and thus the 2 8pu effluent pulse was followed 8226 Tables 4 and 5 present data from analyses of over 800 crayfish collected at our Chautauqua sampling site downstream of Mound Laboratory. These samples were collected as part of an experiment using a fluorescent dye, Rhodamine WT, to trace Mound Laboratory's industrial waste effluent 38 Tissue 239, 2405, 238, 739. 240, uy substantial increase in 238py below Mound Laboratory.