. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 350 BOROUGHS, TOWNSLEY AND HIATT c s o "o o> o ik. O) Q. 70r 60 50 40 30 20 10. Skeleton Visceral organs Integument i i i I I I L i i ' l I L Gills o Muscles j 6 8 10 12 14 21 Days in Sr89 sea water FIGURE 9. The internal distribution of Srs9 taken up by Tilapia iiwssambica from sea water. found. What is important, then, is the rank order of radioactivity in the various organs and systems. Excluding the visceral organs for the reasons given above, it is seen that the other organ systems studied fall in the same rank
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 350 BOROUGHS, TOWNSLEY AND HIATT c s o "o o> o ik. O) Q. 70r 60 50 40 30 20 10. Skeleton Visceral organs Integument i i i I I I L i i ' l I L Gills o Muscles j 6 8 10 12 14 21 Days in Sr89 sea water FIGURE 9. The internal distribution of Srs9 taken up by Tilapia iiwssambica from sea water. found. What is important, then, is the rank order of radioactivity in the various organs and systems. Excluding the visceral organs for the reasons given above, it is seen that the other organ systems studied fall in the same rank order regardless of the mode of entry of the radiostrontium. SUMMARY 1. The ingestion of Srsfl by large pelagic fishes results in the excretion of most of the isotope in a few hours. The small percentage remaining after one day per- sisted for the 27 days of the experiment. The strontium is rapidly eliminated from the visceral organs and tissues, but the structural tissues, including the bones, gills, integument and muscle, maintain their strontium level more or less constant. The o turnover of strontium in these latter tissues is therefore slow. 2. Dark muscle, which has a better blood supply than light muscle, retains less Sr89. Similarly, bone, which is better supplied with blood than is cartilage, retains less Sr89 than the gill arches or the cartilaginous eye ossicles. 3. The excretion of Sr*" by Tilapia uiossauibica is much slower than it is by the pelagic fishes. The percentage of the dose retained is somewhat larger, and most of the radioactivitv is found in the structural Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moor
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