Skin reflectance as a non-lethal measure of smoltification for juvenile salmonids
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Abstract
Our efforts to find nonlethal methods of assessing the parr-smoll transformation of juvenile steelhead Oncorhynchus mykiss and spring and fall chinook salmon O. tshawytscha led to the development of a video system for quantitatively measuring skin silvering using skin reflectance. Gill Na'.K'-ATPase activity, skin guanine concentration, and skin reflectance were recorded from groups of fish marked with freeze brands at hatcheries and downstream sample sites in the Columbia River basin. Skin reflectance of migrants was significantly higher than that of fish before release; nonmigrants (released fish that did not migrate) had significantly lower skin reflectance than migrants from the same groups. Skin reflectance was significantly correlated with gill ATPasc activity and skin guanine concentration. Skin reflectance increased during the parrsmolt transformation and could be used as a nonlethal indicator of smoltification.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Skin reflectance as a non-lethal measure of smoltification for juvenile salmonids |
| Series title | North American Journal of Fisheries Management |
| DOI | 10.1577/1548-8675(1995)015<0814:SRAANM>2.3.CO;2 |
| Volume | 15 |
| Year Published | 1995 |
| Language | English |
| Publisher | Taylor & Francis |
| Contributing office(s) | Western Fisheries Research Center |
| Description | 9 p. |
| First page | 814 |
| Last page | 822 |
| Google Analytic Metrics | Metrics page |