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Otolith Results

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Accuracy and Precision of Fish Ages - Northeast

It is important to ensure consistency in fish ages used in fish population assessments. The Fishery Biology Program in the Northeast conducts age and growth studies and completes regular testing to provide measures of consistency and accuracy.
January 05, 2021 - Data Set ,

Development and Assessment of an Aging Criteria for the Main Hawaiian Islands Crimson Job Fish, Pristipomoides Filamentosus (Opakapaka)

We examined opakapaka microstructure and age to provide information for a stock assessment, with the resulting criterion becoming a reference for future evaluation of main Hawaiian Islands sex-specific growth of opakapaka
October 06, 2020 - Technical Memo ,

Salmon Life History Research in California’s Central Valley

Our team uses microchemical analyses to quantify salmon life history diversity across freshwater, estuarine, and marine ecosystems to improve conservation, management, and recovery.

Age and Growth Homework: Determining How Old Fish Are

Our scientists use technology and ingenuity to get their work done from home.
July 02, 2020 - Feature Story ,

Age and Growth

NOAA Fisheries scientists assess the age and growth rates of fish species and populations to better monitor, assess, and manage stocks.
Columns of ear stones. Each column is from a different species. Otoliths from six species aligned at the core and ready to be sectioned. Photo: Sandy Sutherland, NOAA Fisheries.

Brodeur's Guide to Otoliths of Some Northwest Atlantic Fish

This second edition of Brodeur (1979) includes the original drawings of sagittal otoliths for 51 common fish of the Northwest Atlantic. Species names have been updated, and new citations have been included to give it a more contemporary perspective.
February 28, 2020 - Document ,

Age Determination Methods for Northwest Atlantic Species

This manual documents age determination techniques used by staff at the Woods Hole Laboratory to conduct age and growth studies and determine the age of various species from the New England and the Mid-Atlantic region.
February 28, 2020 - Technical Memo ,
Buttterfish otoliths.png

Reference Collections For Age Determination Of Select Northwest Atlantic Species

The Fishery Biology Program has photographs of our reference collections (known-age fish) for various species. Currently, there are images available for Atlantic cod, haddock, and American shad.
February 28, 2020 - Data Set ,

Precision Templates for Ageing

These templates were designed to automate the calculation of measures of ageing precision (including percent agreement, coefficient of variance, and symmetry tests) and plot results for paired age data.
February 26, 2020 - Tool/App ,

How To Request Samples From The Age-Structure Archive

Guidance for requesting a loan of age structures from the Northeast Fisheries Science Center's archived collection.
February 19, 2020 - Document ,
Buttterfish otoliths.png