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鱼类对矿物质的营养需要及其缺乏症 总被引:6,自引:0,他引:6
矿物质作为鱼类骨骼的构成成分、血球和酶分子的一部分,作为酶作用中的必需因子,以及在完成渗透压的调节等物质代谢和生理作用的过程中起着很重要的作用。鱼类和其它动物一样,体内存在的矿物质中包括钙、磷、钠、钾、氯、镁和硫等常量元素,尚有钴、铬、铜、铁、锌、碘... 相似文献
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本文论述了矿物质常量元素和微量元素在鱼体内的生理功能及缺乏症,鱼类对矿物质元素的需要量,以及矿物质元素原料的选择、应用。 相似文献
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由于不同脂肪源的脂肪酸组成及各脂肪酸之间的比例存在差异,继而各脂肪源饲料在鱼类体内的消化率、对鱼类的生长性能、机体营养组成、鱼体脂肪酸组成及血液生化指标等方面产生的较为显著的影响.本文就国内外不同脂肪源在鱼类饲料中应用的研究进展予以综述. 相似文献
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镁的营养作用研究进展 总被引:10,自引:0,他引:10
镁是生物体内重要的阳离子,参与了体内所有的能量代谢,催化或激化300多种酶体系。本文综述了镁对动物体脂质过氧化、应激及脂类代谢等方面影响的研究近况,并探讨了其可能的作用机制。 相似文献
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Carbohydrate metabolism variables of Oreochromis mossambicus were investigated after acute and chronic sublethal manganese exposure. The sublethal concentrations were determined from the LC50 value of manganese. After the exposures, the fish were carefully netted and blood was drawn from the caudal aorta. The differences in the values of carbohydrate metabolism variables of exposed fish were measured against control values and statistically analysed to prove statistically significant differences in variable values, caused by the metal pollutant (P < 0.05). The results obtained showed changes in the carbohydrate metabolism variables (glucose, lactate, glucose-6-phosphate dehydrogenase and pyruvate kinase concentrations). These alterations are produced as a result of increased levels of Cortisol and catecholamines, as well as hypoxic conditions. The latter induce hyperglycemia and increased lactate levels. Hypoxia may be a result of the damaging effect of manganese on the gills after exposure. The enzymes involved in the carbohydrate metabolism are sensitive to metal exposure and therefore enzyme concentrations fluctuated after the exposure to manganese. Enzyme function plays an important role in the catalysing of chemical reactions in an organism and the disturbance thereof could lead to death. Fish enzyme levels are therefore important biomarkers in the event of metal pollution in a water source. 相似文献
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本文介绍了环境胁迫的种类及在胁迫作用下鱼体内的阶段性的生理变化和鱼体内激素含量、血液指标及免疫系统的影响,这些变化和影响将造成鱼体的组织和器官在一定程度的损伤,达到某种程度将直接导致死亡。中草药添加剂可有效调节鱼类机体新陈代谢及抗应激能力。 相似文献
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