Effect of Body Size on Accumulation and Distribution of ~(125)I in the Green Mussel (perna Viridis)

Effect of body size on accumulation and distribution of 125I in the green mussel (Perna viridis), has been studied. The results showed that concentration capacity of every part in smaller mussels was higher than that in larger ones. Concentration factors of 125I in byssus (about 0. 5 X 103-1. 5 X 103), the highest in all parts of the mussels, were 30-200 times as that in soft tissues, 200~600 times as that in feet, 600 -1000 times as that in shells. Although wet weight of byssus was no more than 1 % of whole body's wet weight, the content of 125I accumulated in it accounted for as high as 75% of total 125I content. The relationship between concentration factor of 125I in byssus and whole body's wet weight (or shell length) can be dis-cribed as a negative power function.