LIVER (a) 20 = a r o KIDNEY (@) BONE (0) 5 BLOOD we “wo oO a _ 2 : GILL (6) 2 wl. (4) oO ce weg a SKIN (0) MUSCLE (6) 0.2 0.4 Figure 3, 0.5 012 3 10 {7 TIME (days) Figure 2. Tissue and Organ Concentrations of 7*’Pu Administered to Channel Catfish as the Citrate via Intracardial Injection. 498 A Littoral Freshwater Microcosm Contaminated with 7?7Pu 50