Thermal marking of Atlantic salmon otoliths

North American Journal of Fisheries Management
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Abstract

By exposing fry of Atlantic salmon Salmo salar to various temperature regimes, we determined conditions required to produce a readable thermal otolith mark. Marks were quantified by using a darkness index that represented the number of times darker the mark was than the background. Minimum requirements for a strong mark were 1 d at a relatively warm premark temperature of 9°C and 8 h at a lower marking temperature (1°C). Temperature decreases of 4°C (from 5°C to 1°C) resulted in strong marks if fish were held at the premark temperature for 4 d and at the marking temperature for at least 24 h.

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Publication type Article
Publication Subtype Journal Article
Title Thermal marking of Atlantic salmon otoliths
Series title North American Journal of Fisheries Management
DOI 10.1577/1548-8675(1998)018<0406:TMOASO>2.0.CO;2
Volume 18
Issue 2
Year Published 2011
Language English
Publisher Wiley
Contributing office(s) Leetown Science Center
Description 5 p.
First page 406
Last page 410
Country United States
State Vermont
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