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Commission for the Conservation of Antarctic Marine Living Resources

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Krill close-up
Photo by James Clark
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Otolith Library

The otoliths (ear bones) of fish function rather like the middle ear of humans in maintaining balance. They are made up of a complex of protein and calcium carbonate that are laid down at different rates in a process and leave alternating opaque and translucent bands in the otolith, just like the growth rings in a tree. So, just like a tree the age of a fish can be determined by counting the rings in the otoliths.

The age of a fish is a critical input into the stock assessment process for both Patagonian and Antarctic toothfish (Dissostichus eleginoides and D. mawsoni). In order to use toothfish age data from different laboratories in the same stock assessment, it is essential to minimise any biases due to inter-laboratory differences in otolith preparation techniques and ageing practices.

CCAMLR has developed this repository of images of aged otoliths to allow learning and inter-calibration of ageing approaches. Otoliths can be viewed either with or without the age displayed to allow comparison trials between readers.

NZ001 Species: Dissostichus mawsoni Source: New Zealand Agreed Age:
23
More info: View record
NZ002 Species: Dissostichus mawsoni Source: New Zealand Agreed Age:
20
More info: View record
NZ003 Species: Dissostichus mawsoni Source: New Zealand Agreed Age:
25
More info: View record
NZ004 Species: Dissostichus mawsoni Source: New Zealand Agreed Age:
18
More info: View record
NZ005 Species: Dissostichus mawsoni Source: New Zealand Agreed Age:
18
More info: View record
NZ006 Species: Dissostichus mawsoni Source: New Zealand Agreed Age:
15
More info: View record
NZ007 Species: Dissostichus mawsoni Source: New Zealand Agreed Age:
19
More info: View record
NZ008 Species: Dissostichus mawsoni Source: New Zealand Agreed Age:
16
More info: View record
NZ009 Species: Dissostichus mawsoni Source: New Zealand Agreed Age:
14
More info: View record
NZ010 Species: Dissostichus mawsoni Source: New Zealand Agreed Age:
13
More info: View record

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This page was last modified on 10 Mar 2021

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Email: ccamlr [at] ccamlr [dot] org
Telephone: +61 3 6210 1111
Fax: +61 3 6224 8744
Address: 181 Macquarie Street, Hobart, 7000, Tasmania, Australia
Postal address: PO Box 213, North Hobart 7002, Tasmania, Australia

 

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