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ANSTO Publications Online >
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Please use this identifier to cite or link to this item:
http://apo.ansto.gov.au/dspace/handle/10238/1969
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| Title: | Comparative accumulation of Cd-109 and Se-75 from water and food by an estuarine fish (Tetractenos glaber). |
| Authors: | Alquezar, R Markich, SJ Twining, JR |
| Keywords: | Fishes Aquatic Ecosystems Estuaries Uptake Radioisotopes Semimetals |
| Issue Date: | Jan-2008 |
| Publisher: | Elsevier |
| Citation: | Alquezar, R., Markich, S. J., & Twining, J. R. (2008). Comparative accumulation of Cd-109 and Se-75 from water and food by an estuarine fish (Tetractenos glaber). Journal of Environmental Radioactivity, 99(1), 167-180. |
| Abstract: | Few data are available on the comparative accumulation of metal(loid)s from water and food in estuarine/marine fish. Smooth toadfish (Tetractenos glaber), commonly found in estuaries in south-eastern Australia, were separately exposed to radio-labelled seawater (14 kBq L-1 of Cd-109 and 24 kBq L-1 of Se-75) and food (ghost shrimps; Trypaea australiensis: 875 Bq g(-1) Cd-109 and 1130 Bq g(-1) Se-75) for 25 days (uptake phase), followed by exposure to radionuclide-free water or food for 30 days (loss phase). Toadfish accumulated Cd-109 predominantly from water (85%) and Se-75 predominantly from food (62%), although the latter was lower than expected. For both the water and food exposures, Cd-109 was predominantly located in the gut lining (60-75%) at the end of the uptake phase, suggesting that the gut may be the primary pathway of Cd-109 uptake. This may be attributed to toadfish drinking large volumes of water to maintain osmoregulation. By the end of the loss phase, Cd-109 had predominantly shifted to the excretory organs - the liver (81%) in toadfish exposed to radio-labelled food, and in the liver, gills and kidney (82%) of toadfish exposed to radio-labelled water. In contrast, Se-75 was predominantly located in the excretory organs (gills, kidneys and liver; 66-76%) at the end of the uptake phase, irrespective of the exposure pathway, with minimal change in percentage distribution (76-83%) after the loss phase. This study emphasises the importance of differentiating accumulation pathways to better understand metal(loid) transfer dynamics and subsequent toxicity, in aquatic biota. © 2007, Elsevier Ltd. |
| URI: | http://dx.doi.org/10.1016/j.jenvrad.2007.07.012 http://apo.ansto.gov.au/dspace/handle/10238/1969 |
| ISSN: | 0265-931X |
| Appears in Collections: | Journal Articles |
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