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首页> 外文期刊>Fisheries Science >Mg-calcite, a carbonate mineral, constitutes Ca precipitates produced as a byproduct of osmoregulation in the intestine of seawater-acclimated Japanese eel Anguilla japonica
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Mg-calcite, a carbonate mineral, constitutes Ca precipitates produced as a byproduct of osmoregulation in the intestine of seawater-acclimated Japanese eel Anguilla japonica

机译：镁方解石（一种碳酸盐矿物）构成Ca沉淀物，该沉淀物是海水驯化的日本鳗An（Anguilla japonica）肠道中渗透压调节的副产物。

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摘要

Marine teleosts are known to produce white feces, which is often referred to as Ca precipitates. Ca precipitates have been suggested to be a product of osmoregulation. In the present study, we examined the physicochemical nature of Ca precipitates, and possible involvement of Ca precipitate formation in hyposmoregulatory processes in seawater-acclimated Japanese eel. Whereas Ca precipitates were not produced in eel acclimated to freshwater, Ca precipitates were seen in eel acclimated to seawater in a salinity-dependent manner. According to X-ray diffraction analysis, Ca precipitates were a mixture of carbonate minerals: Mg-calcite and its amorphia. Quantitative analysis showed that the molar ratio between Ca and Mg was approximately 7:2. Ca precipitate formation was reduced in eel exposed to low-Ca2+ or low-Mg2+ seawater, indicating that Ca and Mg in Ca precipitates were derived from seawater.
机译：已知海洋硬骨鱼会产生白色的粪便，通常称为钙沉淀物。已经表明Ca沉淀是渗透压调节的产物。在本研究中，我们研究了Ca沉淀物的理化性质，以及在海水驯化的日本鳗中，Ca沉淀物的形成可能与低剂量调节过程有关。尽管在适应淡水的鳗鱼中未产生钙沉淀物，但在适应海水的鳗鱼中却以盐度依赖性的方式观察到了钙沉淀物。根据X射线衍射分析，Ca沉淀物是碳酸盐矿物（方解石镁及其无定形物）的混合物。定量分析表明，Ca和Mg之间的摩尔比约为7：2。暴露于低Ca 2 + 或低Mg 2 + 海水中的鳗鱼中Ca沉淀物的形成减少，表明Ca沉淀物中的Ca和Mg来自海水。

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