부산대학교 도서관

The migratory history of the Hemibarbus barbus species complex in the tidal area of the Miya River, Mie Prefecture, was studied by examining the strontium (Sr) and calcium (Ca) concentration in their otoliths (lapillus) using wavelength dispersive X-ray spectrometry with an electron microprobe. Otolith Sr:Ca ratios of 1 out of 7 specimens remained consistently low from the core to the edge. This specimen with uniformly low Sr: Cr ratios had not experienced a saline environment. Otolith Sr: Ca ratios of 6 out of 7 specimens had increased. These specimens with higher Sr: Ca ratios had experienced salinity in their environment. Otolith Sr: Ca ratios of all specimens showed low value around the core. This low Sr: Ca ratio around the core shows that they migrated to tidal area after living in a fresh-water environment. A high value of otolith Sr: Ca ratios at the edge shows that some adults inhabit a saline environment in the tidal zone. These various patterns of otolith Sr: Ca ratios show that the use salinity rich environments differs among individuals.