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Morphological changes of integumental chloride cells to ambient cadmium during the early development of the teleost, Oreochromis mossambicus

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Newly-hatched embryos of Oreochromis mossambicus were reared in freshwater and treated with 0 (control), 50 (low level) or 200 (high level) ppb cadmium for 4 days. Changes in the numbers and dimensions of chloride cell apical crypts on the skin of the free embryos were examined daily using scanning electron microscopy. The apical crypts of the chloride cells were rarely observed on the skin of the embryo trunk, and unevenly distributed on the surface of the yolksac. Two days after hatching, the chloride cells of the free embryos exposed to 50 ppb Cd were more ‘active’ than those of the other two groups. Compared with the control group, the maximum dimensions of the developing apical crypts were stimulated by 50 ppb Cd and inhibited by 200 ppb Cd. The results indicated that the development of chloride cells in tilapia free embryos was provoked by low level Cd exposure and stunted by high level Cd exposure, suggesting the existence of structure/function relationships in which the activation of chloride cells may be related to the ionoregulatory mechanism in adaptation to Cd exposure.

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Authors and Affiliations

  1. Institute of Zoology, National Taiwan University, 107, Taipei, Taiwan, Republic of China

    Tsung-Han Lee

  2. Institute of Zoology, Academia Sinica, 115, Nankang, Taipei, Taiwan, Republic of China

    Tsung-Han Lee, Pung-Pung Hwang & Hui-Chen Lin

  3. Department of Biology, Tunghai University, 407, Taichung, Taiwan, Republic of China

    Hui-Chen Lin

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  1. Tsung-Han Lee
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Lee, TH., Hwang, PP. & Lin, HC. Morphological changes of integumental chloride cells to ambient cadmium during the early development of the teleost, Oreochromis mossambicus . Environ Biol Fish 45, 95–102 (1996). https://doi.org/10.1007/BF00000631

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  • DOI: https://doi.org/10.1007/BF00000631

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