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Scale development and age determination in New Zealand freshwater eels(Anguillaspp.)
| Content Provider | Scilit |
|---|---|
| Author | Jellyman, D. J. |
| Copyright Year | 1979 |
| Description | The appearance and development of scales in Anguilla australis Richardson and A. dieffenbachii Gray were studied to assess the value of scales in age determination. Scales first appear in an area two‐thirds along the anus‐tail tip distance, when eels are 16–20 cm long. The rate of lateral and longitudinal scale spreading, scale size, and the number of scale rings were all positively related to fish length. The formation of new scale rings showed no seasonal pattern, so these rings cannot be used for age determination. Age could not be determined from length‐frequency histograms owing to overlapping of data from adjacent year‐classes. However, examination of otoliths prepared by burning showed that the otolith rings were annual in formation, and could be satisfactorily used to calculate age. |
| Related Links | https://www.tandfonline.com/doi/pdf/10.1080/00288330.1979.9515777?needAccess=true |
| Ending Page | 30 |
| Page Count | 8 |
| Starting Page | 23 |
| ISSN | 00288330 |
| e-ISSN | 11758805 |
| DOI | 10.1080/00288330.1979.9515777 |
| Journal | New Zealand Journal of Marine and Freshwater Research |
| Issue Number | 1 |
| Volume Number | 13 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 1979-03-30 |
| Access Restriction | Open |
| Subject Keyword | Fisheries Sciences New Zealand Age Determination Anguilla Otoliths Formation Scale Rings |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Water Science and Technology |
