Kohma Arai

Portrait of Kohma Arai

Position Title
Postdoctoral Research Scholar

Bio

I am a Postdoctoral Research Scholar, working with Drs. Rachel Johnson and Carson Jeffres at the Center for Watershed Sciences, interested in studying fish life history diversity and how those behaviors affect population structure and dynamics. My work focuses on (1) estimating abundance and population composition of juvenile fall-run Central Valley Chinook salmon by leveraging otolith chemistry, acoustic telemetry, machine learning, and spatial statistics; (2) reconstructing experienced temperature and estimating temperature-dependent mortality of winter-run Central Valley Chinook salmon using otolith oxygen stable isotopes measured with secondary ion mass spectrometry (SIMS); and (3) studying natal origin and stock mixing of Atlantic bluefin tuna using otolith stable isotope landscapes (“isoscapes”).

 

Education and Degree(s)
  • Ph.D., Marine Estuarine Environmental Science, University of Maryland, 2023
  • M.S., Environmental Science, The University of Tokyo, Japan, 2017
  • B.S., Fisheries Science, Hokkaido University, Japan, 2015
Research Interests & Expertise
  • Fish Ecology
  • Fisheries Management
  • Otolith
  • Stable Isotopes
  • Machine Learning