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Otolith research information

Scientific information on topics relating to otoliths and ageing methods.

Microstructure examinations

How we use otolith deposit growth increments to gain information on fish.


Preparation and interpretation, age validation and mass processing.

Age validation

Best methods for insuring accuracy in large-scale production ageing and small-scale research projects.

Ageing quality control

Avoid otolith ageing errors and incorrect conclusions.

Bomb radiocarbon

Challenges to precise ageing and how using bomb radiocarbon overcomes some of those issues.

Radiochemical dating

About elemental assays, radioactive decay and isotopic ratios.

Otolith shape

Reconstructing fish species and size composition from the diet of fish predators.

Elemental tags

Elemental composition assumptions, what affects elemental tags and types of fingerprinting.

Laser assays

Beam-based elemental assays advantages and disadvantages, instruments, reconstruction ability and migration analysis.

Temperature history

How we reconstruct otolith temperature histories using isotopes and relative temperature histories.

Growth models

Growth rate calculations, back-calculations, constraints and the biological intercept method.


Otoliths in studies of recruitment processes and determination of growth patterns.

Image analysis

About image analysis systems, applications and our system setup.

Validated images

Images of otoliths that have been part of an age validation study and have had their ages reasonably confirmed.

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