[A-OS12] Marine ecosystems and biogeochemical cycles: theory, observation and modeling

[AOS12-P10] Future direction to elucidate fish response to climate change

*Shin-ichi Ito¹ (1.Atmosphere and Ocean Research Institute, The University of Tokyo)

Keywords:otolith microchemistry, fish eye lens, ocean DNA

Various studies have been conducted to elucidate the climate variability impacts on living marine resources. Larval and juvenile stages are critical periods for the recruitment of living marine resources. However, limitations of observation methods for directly investigating the environments that larvae and juveniles experienced have been obstacles to our understanding. In this study, recent developments of new technologies to investigate environments that larvae and juveniles experienced are reviewed. Based on the new technologies, a new integrated method to elucidate environmental histories of larvae and juveniles, using otolith oxygen stable isotope analyses, eye lens nitrogen stable isotope analyses and fish growth–migration models, is proposed. Together with the growth estimated from otolith daily increments and fish distribution estimated by ocean DNA, it is possible to elucidate climate impacts on larval and juvenile growth through environmental histories of larvae and juveniles using their realistic migration routes.