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- Knowledge of fish age characteristics is necessary for stock assessments, and to develop management or conservation plans. Size is generally associated with age; however, there are variations in size at any particular age for most fish species making it difficult to estimate one from the other with precision. Therefore, researchers interested in determining a fish age look for structures which increase incrementally with age. The most commonly used techniques involve counting natural growth rings on the scales, otoliths, vertebrae, fin spines, eye lenses, teeth, or bones of the jaw, pectoral girdle, and opercular series. Even reliable aging techniques may vary among species; often, several different bony structures are compared among a population in order to determine the most accurate method. (en)
- Leeftijdsaflezing wordt binnen de visserijbiologie gebruikt om de leeftijdssamenstelling van een visstapel te kunnen bepalen. Aan de hand van patronen in de gehoorbeentjes van vissen, hun vinstralen of schubben wordt geschat hoe oud een vis was toen die werd gevangen. (nl)
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- Sagittal otolith from a 74-year-old freshwater drum, Aplodinotus grunniens (en)
- Fish otolith on a sectioning saw (en)
- Scale of a common carp (en)
- Still transparent juvenile herring. The otoliths are visible left of the eye. (en)
- Some bony structures such as fin rays and pectoral spines can be harvested without sacrificing the fish, unlike otoliths. (en)
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- Fish otolith on sectioning saw - USGS.jpg (en)
- Herringjuvenilekils.jpg (en)
- Lingcodskeleton1600ppx.JPG (en)
- Oldest freshwater drum sagittal otolith.jpg (en)
- PSM V35 D074 Scale of common carp.jpg (en)
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- Leeftijdsaflezing wordt binnen de visserijbiologie gebruikt om de leeftijdssamenstelling van een visstapel te kunnen bepalen. Aan de hand van patronen in de gehoorbeentjes van vissen, hun vinstralen of schubben wordt geschat hoe oud een vis was toen die werd gevangen. (nl)
- Knowledge of fish age characteristics is necessary for stock assessments, and to develop management or conservation plans. Size is generally associated with age; however, there are variations in size at any particular age for most fish species making it difficult to estimate one from the other with precision. Therefore, researchers interested in determining a fish age look for structures which increase incrementally with age. The most commonly used techniques involve counting natural growth rings on the scales, otoliths, vertebrae, fin spines, eye lenses, teeth, or bones of the jaw, pectoral girdle, and opercular series. Even reliable aging techniques may vary among species; often, several different bony structures are compared among a population in order to determine the most accurate met (en)
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- Age determination in fish (en)
- Leeftijdsaflezing (nl)
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