MF25053Advancing fish early life-history research: daily age determination of walleye pollock (Gadus chalcogrammus) with Fourier transform–near-infrared spectroscopy




Fish daily age information provides insight into growth, phenology, recruitment and survival, but is rarely incorporated into fisheries management because data collection is laborious. We tested Fourier transform–near-infrared (FT-NIR) spectroscopy as a rapid method to determine daily age from otoliths of an important commercial species, walleye pollock (Gadus chalcogrammus). Results indicated that FT-NIR spectroscopy may provide a valuable tool to collect daily age information for research and management.