A comparison of the scale and otolith methods of ageing alewife (Alosa pseudoharengus) and blueback herring (Alosa aestivalis) / by James W. Kornegay.
| Author/creator | Kornegay, James W. author. |
| Other author | O'Rear, Charles W., degree supervisor. |
| Other author | East Carolina University. Department of Biology. |
| Format | Theses and dissertations |
| Production | 1977. |
| Description | 79 leaves : illustrations ; 28 cm |
| Supplemental Content | Access via ScholarShip |
| Subjects |
| Subject | The purposes of this study were to determine levels of agreement between ages obtained from scales and otoliths of alewife and blueback herring; to compare age composition of the sample as determined by both methods; to compare length composition within each scale and otolith age group; to compare fork length/scale radius and fork length/otolith radius relations; and to compare growth curves derived from scale and otolith data. Levels of agreement between scale and otolith ages were 57.197% (alewife) and 67.967% (blueback herring). Age composition of the alewife sample as determined by both methods was statistically similar; however, differences occurred within the blueback herring sample. Length composition of each scale and otolith age group was determined to be statistically similar except in the age three groups of both species. Fork length/scale radius relations were linear in both species. Fork length/otolith radius relations differed notably. Mean fork lengths of each scale and otolith age group were plotted as growth curves and appear similar in both species. Fork lengths at each previous scale and otolith age were determined by back calculation of annuli measurements of scales and otoliths. Mean back calculated fork lengths were plotted as growth curves. In both species, growth curves derived from back-calculation of scale annuli measurements tend to estimate values higher than growth derived from otolith annuli measurements. |
| General note | "A thesis presented to the faculty of the Department of Biology ... in partial fulfillment of the requirements for the degree Master of Science in Biology." |
| General note | Advisor: C.W. O'Rear, Jr. |
| Dissertation note | M.A. East Carolina University 1977 |
| Bibliography note | Includes bibliographical references (leaves 61-62). |
Availability
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|---|---|---|---|---|
| Joyner | University Archives | ASK AT SPECIAL COLLECTIONS DESK | ✔ Available | Request Material |
| Electronic Resources | Access Content Online | ✔ Available |