An electron probe microanalyzer(EPMA) was applied to analyze the element Sr and Ca microchemistry patterns in otoliths of Larimichthys polyactis in Lüsi coastal waters of Jiangsu Province,China.The results showed that Sr was heterogeneously distributed along the sagittal plane of the otoliths.The highest Sr concentration was normally found in the otolith cores while much lower concentrations were found in the remaining areas.The corresponding Sr / Ca ratios were(7.10 ± 1.00) and(4.79 ± 1.01) in the former a...