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Age and Growth Program

Fish length frequency plot

Other Age Validation and Corroboration

Besides radiometric and bomb carbon validation there are other methods of supporting otolith growth interpretation. These methods include marginal increment analysis (MIA), tracking fish year classes, mark and recapture, and known age fish.


  • Kimura, D. K., D. M. Anderl, and B. J. Goetz. 2007. Seasonal marginal growth on otoliths of seven Alaska groundfish species support the existence of annual patterns. Alaska Fish. Res. Bull. 12:243-251. (.pdf, 700KB) Online.
  • Kimura, D.K., C.R. Kastelle , B.J. Goetz, C.M. Gburski, and A.V. Buslov. 2006. Corroborating ages of walleye pollock (Theragra chalcogramma), Aust. J. of Mar. and Freshwater Res. 57:323-332.
  • Roberson, N. E., D. K. Kimura, D. R. Gunderson, and A. M. Shimada. 2005. Indirect validation of the age-reading method for Pacific cod (Gadus macrocephalus) using otoliths from marked and recaptured fish. Fish. Bull., U.S. 103:153-160. (.pdf, 212kb)  Online.
  • Anderl, D.M., A. Nishimura, and S.A. Lowe. 1996. Is the first annulus on the otolith of the Atka mackerel (Pleurogrammus monopterygius) missing? Fish. Bull. 94:163-169.


  • Is Corroborating Ages a Valid Concept in (Walleye pollock, Theragra chalcogramma) Fish Age Determination? (By D. Kimura, A. Buslov, B. Goetz, C. Gburski, and C. Kastelle)

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