Estimating age and growth of invasive Great Lakes sea lamprey: A review of approaches and investigation of a new method

Journal of Great Lakes Research
By: , and 

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Abstract

We review recent advances in age and growth estimation of invasive sea lamprey (Petromyzon marinus) in the Great Lakes and present a more accurate method for growth estimation. To forecast growth and prioritize streams for control actions, sea lamprey managers currently use an average daily growth model. Here, a new linear model that included stream and lake as contributing variables was investigated and found to outperform the currently used growth model (roughly a 10 mm difference at age 1). Length-at-age of larvae between ages 1 and 4 were also best forecasted by a linear model with the predictor variables including growing degree days, stream, lake, and larval lamprey density. The model predicts that larval sea lamprey grow faster in warm streams with low densities of lamprey larvae. More accurate growth models could allow sea lamprey control managers to improve decisions concerning how sea lamprey control effort is allocated among streams, and could help inform broader modeling efforts evaluating the population demographics of a lake-wide populations exposed to varying control and environmental scenarios. Priority areas for research include investigating if temperatures have increased in sea lamprey-producing streams in response to climate change, using close-kin mark-recapture to mark family groups at age 1 to age large larvae and transformers years later, and determining if sex determination is environmentally mediated by larval growth and density.

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Publication type Article
Publication Subtype Journal Article
Title Estimating age and growth of invasive Great Lakes sea lamprey: A review of approaches and investigation of a new method
Series title Journal of Great Lakes Research
DOI 10.1016/j.jglr.2020.06.002
Edition Online First
Year Published 2020
Language English
Publisher Elsevier
Contributing office(s) Great Lakes Science Center
Country United States, Canada
Other Geospatial Great Lakes
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