Arai T ; Kotake A ; Goto A ;

Journal of Applied Ichthyology vol. 20 (3)   pp. 238-240, 1 Jui 2004

Summary Strontium (Sr) and calcium (Ca) concentrations in the otoliths of the shirauo, Salangichthys microdon, collected from Japanese coastal waters were examined by wavelength-dispersive X-ray spectrometry on an electron microprobe. The otolith Sr : Ca ratios gradually increased from 15.7-19.7 x 10-3 around the core to 32.8-39.4 x 10-3 around the edge of otoliths, with no transition point from the low Sr : Ca ratio phase to the high phase. The fluctuation pattern of otolith Sr : Ca ratios was different from the anadromous form reported in a previous study. The evidence indicates that the fish do not necessarily migrate into freshwater during the growth phase

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