Determination and comparison of trace element content in four tissues of two Antarctic fish species
Chionodraco hamatus and Trematomus bernacchii belong to the same species and have similar living conditions,while C.hamatus lacks hemoglobin and functional red blood cells.To explore the differences of trace elements in four tissues of two Antarctic fish,the contents of nine trace elements including Cr,Mn,Fe,Cu,Zn,As,Se,Cd and Hg were compared by inductively coupled plasma mass spectrometry.The results showed that the contents of Se,Cd and Hg in the mesonephros were significantly higher in C.hamatus than in T.bernacchii.The contents of Fe,Mn,Zn and Hg in pronephros,the contents of Cr,Mn,Fe,As,Se,Cd and Hg in spleen,and Fe,Mn,Zn,As,Cd and Hg in liver were significantly lower in C.hamatus than the corresponding parts of T.bernacchii.Fe,as an important component of hemoglobin,also plays an important role in oxygen transportation,hemoglobin synthesis,and combination with myoglobin for muscle storage of oxygen;Fe content in three tissues was significantly different in both fish species.Fe content in pronephros,spleen,and liver of C.hamatus was significantly lower than that in T.bernacchii,indicating that the lack of hemoglobin limited the absorption of Fe in three tissues of Chionodraco hamatus.In fish,pronephros and spleen play important hematopoietic and immune functions,and mesonephros and liver have the role of treating metabolic waste.The concentrations of these nine trace elements in four tissues of two Antarctic fish were as follows:higher concentrations in mesonephros and spleen of C.hamatus,and higher concentrations in spleen of T.bernacchii.Trace elements can be transported by red blood cells,exist in various ionic forms in the body through redox reactions,and metabolically accumulate in tissues and organs.Differential analysis of tissue trace elements in fish can help explore the physiological differences between two Antarctic fish species,which also provides reference data for the biological research of Antarctic fishery resources in China.As a heavy metal element,Hg can be carried to the Antarctic for a long distance through human activities and atmospheric circulation.Atmospheric sedimentation is the main way for Hg to enter the ocean.The significantly higher Hg content in two Antarctic fish,compared to fish liver tissues in other non-Antarctic marine waters,suggests a possible degree of Hg contamination in Antarctic waters.
万方数据
维普
