Age, year‐class strength variability, and partial age validation of Kiyis from Lake Superior

North American Journal of Fisheries Management
By: , and 

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Abstract

ge estimates of Lake Superior Kiyis Coregonus kiyi from scales and otoliths were compared and 12 years (2003–2014) of length frequency data were examined to assess year‐class strength and validate age estimates. Ages estimated from otoliths were precise and were consistently older than ages estimated from scales. Maximum otolith‐derived ages were 20 years for females and 12 years for males. Age estimates showed high numbers of fish of ages 5, 6, and 11 in 2014, corresponding to the 2009, 2008, and 2003 year‐classes, respectively. Strong 2003 and 2009 year‐classes, along with the 2005 year‐class, were also evident based on distinct modes of age‐1 fish (<110 mm) in the length frequency distributions from 2004, 2010, and 2006, respectively. Modes from these year‐classes were present as progressively larger fish in subsequent years. Few to no age‐1 fish (<110 mm) were present in all other years. Ages estimated from otoliths were generally within 1 year of the ages corresponding to strong year‐classes, at least for age‐5 and older fish, suggesting that Kiyi age may be reliably estimated to within 1 year by careful examination of thin‐sectioned otoliths.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Age, year‐class strength variability, and partial age validation of Kiyis from Lake Superior
Series title North American Journal of Fisheries Management
DOI 10.1080/02755947.2017.1350222
Volume 37
Issue 5
Year Published 2017
Language English
Publisher Wiley
Contributing office(s) Great Lakes Science Center
Description 10 p.
First page 1151
Last page 1160
Other Geospatial Lake Superior
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