This table lists the species for which we currently collect age samples, along with the structures and preparation methods for each one. Various additional species have been collected in the past, and structures collected historically may be different.
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.
See what species are being aged at the Alaska Fisheries Science Center and the status of ageing requests with our dynamic summaries that are updated weekly. Select a request either by choosing an individual species or all species.
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.
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.
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.
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.
