Fish in the ocean dating

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The age-reading protocol was generally validated and it was possible to describe length-at-age despite difficulties in counting otolith growth zones beyond 30-40 years.

Growth curves differed between sexes and a 4-parameter generalized von Bertalanffy growth function provided the best fit.

I have been working with Ed De Martini (PIFSC - Life History Program) to complete an age validation project that includes the age-at-maturity, as well as aspects of reproduction.

This work is an extension of work started by Jeff Eble (former University of Hawaii graduate student) and is a collaborative effort amongst the three of us.

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Age has been estimated from growth zone counting in otoliths and I have extracted a series of otolith cores from fish of differing estimated age that have been tested with bomb radiocarbon dating.

These samples were measured for radiocarbon at Woods Hole Oceanographic Institution at the National Ocean Sciences Accelerator Mass Spectrometry Facility (NOSAMS) and the final paper is in press.

One of the challenges, and hence the “state-of-the-art” claim in the title above, is with the size of the otoliths from this fish.

They are small and for me to validate the age I need to extract the core (first year of growth or less) from the otolith and analyze it for radiocarbon.

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