The fourspine sculpin Rheopresbe kazika is a cottid fish endemic to Japan, and this fish is designated as a national monument species in some areas of the country. The natural population of the fish has decreased in recent years, and therefore various efforts have been made to establish an efficient culture system for this species. However, there is little information available regarding the life history and migration of the species. The migratory history of R. kazika was examined in terms of strontium (Sr) and calcium (Ca) uptake in the otolith by means of wavelength dispersive X-ray spectrometry on an electron microprobe. The Sr:Ca ratios in the otoliths changed with the salinity of the habitat. The otoliths of R. kazika fluctuated strongly along the life history transects in accordance to their migration patterns from seawater to freshwater. The Sr:Ca ratios within R.kazika averaged 4.15 × 10^− 3 in the otolith region from the core to the point (360–475 µm) and decreased to lower levels which averaged 1.37 × 10^− 3, in the outer otolith region. The data suggest that this species has a catadromous life cycle and the otolith Sr:Ca ratios reflect individual life histories within R. kazika.

Fourspine sculpin Rheopresbe kazika是日本特有的鱼，在该国某些地区被指定为国家级纪念物。近年来，鱼类的自然种群减少了，因此人们为建立该物种的有效养殖系统做出了各种努力。但是，关于该物种的生活史和迁徙的信息很少。通过电子微探针上的波长色散X射线光谱法，根据耳石中锶（Sr）和钙（Ca）的吸收情况，检查了卡齐卡氏菌的迁移史。耳石中的Sr：Ca比值随栖息地的盐度而变化。卡齐卡河的耳石沿生活史样条线从海水到淡水的迁移模式剧烈波动。所述SR：内Ca比值 R. kazika平均4.15×10 ^{- 3}在耳石区域从核心到点（360-475微米）和降低，以降低平均为1.37×10级^{- 3}，在外耳石区域。数据表明，该物种的生命周期是巨大的，耳石中Sr：Ca的比值反映了卡兹卡树内的个体生活史。