A non-lethal measure of smolt status of juvenile steelhead based on body morphology
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Abstract
A nonlethal morphometric method to assess smolt status of juvenile steelhead Oncorhynchus mykiss was validated. Fish were collected from hatcheries before release and during their seaward migration in a large river system. Fifteen anatomical landmarks were digitized from photographs of each fish, resulting in 34 morphometric characters based on a truss network. Principal component and canonical discriminant function analyses were used to assess smolt status. A single canonical variate was significantly correlated with gill Na+,K+-ATPase activity, a commonly used measure of smolt status. This nonlethal method may be a useful measure of smolt status when sacrificing fish is not desirable or possible; it requires little training to perform, but it does require a larger sample size than some other methods.
Suggested Citation
Beeman, J.W., Rondorf, D., Tilson, M., Venditti, D., 1995, A non-lethal measure of smolt status of juvenile steelhead based on body morphology: Transactions of the American Fisheries Society, v. 124, no. 5, p. 764-769.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A non-lethal measure of smolt status of juvenile steelhead based on body morphology |
| Series title | Transactions of the American Fisheries Society |
| Volume | 124 |
| Issue | 5 |
| Year Published | 1995 |
| Language | English |
| Publisher | Taylor & Francis |
| Contributing office(s) | Western Fisheries Research Center |
| Description | 6 p. |
| First page | 764 |
| Last page | 769 |