Late-stage larval walleye pollock otolith marked every 7 days by immersion in alizarin-red dye and viewed under ultra-violet light.
Late-stage larval walleye pollock otolith marked every 7 days by immersion in alizarin-red dye and viewed under ultra-violet light.
Close-up of the above otolith, with 6 daily rings falling between the weekly dye markings. Sub-daily increments can be observed between the daily check marks.