Abstract
Fish otolith is calcium carbonate polycrystalline body containing organic matter including protein. It was reported that teleost sagitta and lapillus are made by aragonite, and astriscus is made by vaterite. Sagitta , lapisus and astaricus are ones of fish otolith. But other studies about teleost fish proved that many factors cause generation of differ crystal polymoph in sagitta.
In this study, characteristics of aragonite and vaterite in sagitta were studied by thermogravimetry and differential thermal analysis. In the result, sagitta aragonite show 710K exothermic peak without variation in weight. In other hand, sagitta and synthesis vaterite show 740K exothermic peak in common. Those results suggest that there are some characteristics that specific to sagitta.
