『Abstract
　The chemistry of recent fish scales (tench, common carp, amur and European perch) and subrecent fish scales (European perch and mostly taxonomically not determined) was studied by means of laser ablation inductively coupled plasma mass spectrometry and electron microprobe from shallow boreholes in the abandoned meander Certak near Uherske（後のeの頭に´） Hradiste. A detailed study of subfossil fish confirms extremely rapid changes in the chemical composition of hydroxylapatite during very early diagenetic processes in the first 2 years, which does not change significantly in the bottom of the boreholes about 25 years old. While there is an enormous increase in Na, K, Ba and Sr, Fe and Mn, there is a major decrease in Mg. The fish scales from 70 to 78 cm (6-8 years old) are approaching already the level of francolite-type hydroxylapatite. The high Na content indicates carbonate substitutions for OH or PO4 group. Consequently, environmental interpretations based on the chemistry of fossil hydroxylapatites require extreme caution. In recent fish scales, the element concentrations reflect not only the position in the trophic pyramid but also a complicated interplay of the diet, physiological processes and environmental contamination.

Keywords: Hydroxylapatite; Fish scale; LA-ICP-MS; Diagenesis; Trophic web; Abandoned meander; Morava River』

Introduction
Materials and geological setting
Methods
　Sample preparation
　Laser ablation ICP MS
　Electron microprobe
　Terminology for apatite
Results
　Sediment
　Fish scales
Discussion
　Fluorine
　Iron and manganese
　Barium and strontium
　Magnesium
　Calcium
　Alkali metals
　Heavy metals
Conclusions
Acknowledgments
References