. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. METABOLISM OF RADIOSTRONTIUM BY FISH 343 which persists is also larger than that observed with the pelagic fishes, although the variability among the Tilapia was fairly large. The Tilapia used in these ex- periments were fed the Sr89 in gelatine capsules containing cracker crumbs. Occa- sionally crumbs were observed in the carboys used to hold three of the experimental fish, and therefore the true dose could not be ascertained. The incorporation of the isotope in gelatine for the later experiments has apparently obviated thi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. METABOLISM OF RADIOSTRONTIUM BY FISH 343 which persists is also larger than that observed with the pelagic fishes, although the variability among the Tilapia was fairly large. The Tilapia used in these ex- periments were fed the Sr89 in gelatine capsules containing cracker crumbs. Occa- sionally crumbs were observed in the carboys used to hold three of the experimental fish, and therefore the true dose could not be ascertained. The incorporation of the isotope in gelatine for the later experiments has apparently obviated this difficulty. Table II presents the data concerning the percentage of the total radioactivity recovered in the various organs and tissues. Figure 4 is a graph of this informa- tion except that the ordinate is given in microcuries/gram fresh weight of fish. 10000 1000 0010 0001. 678 Doys offer dose 10 12 13 14 FIGURE 4. The distribution of a single ingestion of Sr89 in organs and tissues of Tilapia mossambica as a function of time. The structural tissues account for the bulk of the radioactivity where approximately 90-95 per cent of the activity is present in both Tilapia and the pelagic fishes. Roughly, about 60 per cent is accounted for by the skeleton, 30 per cent by the integument, 10 per cent by the gills, 2 per cent by the muscle, and 1 per cent by the viscera. A larger percentage of radioactivity is found in the integument of Tilapia than in the integument of the other fishes, probably because a larger percentage of the body weight of this species is due to the large scales. The percentage of the total radioactivity in Tilapia was found to decrease in the following order: skeleton, integument, gills, muscle and viscera. The order in the pelagic fishes studied was skeleton, gills, integument, muscle and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these il
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
