Skin reflectance as a non-lethal measure of smoltification for juvenile salmonids

North American Journal of Fisheries Management
By: , and 

Links

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.

Additional publication details

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
Additional metadata about this publication, not found in other parts of the page is in this table