Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 7032
Title: A thermal-marking technique for juvenile salmonids
Author: Alan B. Groves, Anthony J. Novotny
Publication Year: 1965
Journal: Transactions of the American Fisheries Society
Volume: 94
Issue: 4
Pages: 386-389

Work with juvenile salmonids often calls for short-term marking techniques by which individual fish or groups of fish may be identified for varying periods.  Such recognition can be provided by various familiar means such as fin removal, attachment of markers or tags, tattooing, or perhaps whole–body staining.  Although the above methods may each serve in specific applications, a simple, quickly learned technique is needed which will permit the rapid use of a variety of visible surface marks such as letters, numbers, or symbols, by which individual fingerlings may be recognized easily over intervals of weeks or months.  The purpose of this report is to describe a marking system which appears to meet such needs.  The method consists of marking juvenile salmonids by topical application of mild heat to dorsal skin surfaces.   

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