Excretion Rate of Cadmium and the Variations of Mineral Contents in Killifish (Oryzias latipes) Kept in River Water
| Autor: | Mitsuru Oka, Noriko Koizumi, Yasuko Sekine |
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| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Japanese Journal of Health and Human Ecology. 63:266-275 |
| ISSN: | 1882-868X 0368-9395 |
| Popis: | Killifish kept in distilled water or in river water containing 10 M-CdSO4 for 24 hrs, were then transferred to the same water without cadmium (Cd). Survival rate ofthe fish in the distilled water was 63.6% at 24 hrs after the transfer and 50.0% at 168 hrs, whereas no dead fish was observed in the river water even at 168 hrs. Cd uptaken preliminarily was excreted with a relatively rapid rate up to 24 hrs after the transfer, followed by a slow excretion rate. Cd remained in the fish kept in the river water for 168 hrs was 32.2% of the uptaken, whereas that in the distilled water was 74.0%. The contents of zinc and calcium in the alive fish (/gram) increased highly significantly during the excretion phases of Cd both in the distilled and river water. Those of iron and copper increased significantly in the distilled water, but did not in the river water. In considering the decrease of body weight owing to non-supplementation of feed, minerals in the whole fish were assessed. A significant increase in zinc and calcium was also observed; however, that in iron and copper even in the distilled water was not observed. From the observations, it is assumed that the intakes of zinc and calcium should be needed, while iron and copper were not actively taken during the excretion phase of Cd. |
| Databáze: | OpenAIRE |
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