A guide to the interpretation of sea trout scales
The overall purpose of this guide is to provide a manualfor the collection and interpretation of sea trout scales. Abrief introduction considers the advantages anddisadvantages of using scales to determine age and growth.To ensure that scales are interpreted in a consistentmanner, all major terms are defined and a standard systemfor age notation is proposed. The methodology for thecollection, mounting and interpretation of scales isdescribed in detail, and this is followed by a section on the back-calculation of lengths at different ages. Each topic is discussed critically. The final part of this guide is an atlas illustrating scales from a wide range of sea trout and including not only excellent "type-scales" but also difficult and impossible scales.
| Main Authors: | , |
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| Format: | monograph biblioteca |
| Language: | English |
| Published: |
National Rivers Authority
1996
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| Subjects: | Biology, Fisheries, Limnology, Scales, Tagging, Salmo trutta, Scale reading, Age, Animal morphology, Length, |
| Online Access: | http://hdl.handle.net/1834/25127 |
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| Summary: | The overall purpose of this guide is to provide a manualfor the collection and interpretation of sea trout scales. Abrief introduction considers the advantages anddisadvantages of using scales to determine age and growth.To ensure that scales are interpreted in a consistentmanner, all major terms are defined and a standard systemfor age notation is proposed. The methodology for thecollection, mounting and interpretation of scales isdescribed in detail, and this is followed by a section on the back-calculation of lengths at different ages. Each topic is discussed critically. The final part of this guide is an atlas illustrating scales from a wide range of sea trout and including not only excellent "type-scales" but also difficult and impossible scales. |
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