Journal
JOURNAL OF FISH BIOLOGY
Volume 90, Issue 4, Pages 1305-1320Publisher
WILEY
DOI: 10.1111/jfb.13230
Keywords
brook lamprey; Entosphenus tridentatus; larval fish; mortality estimates; population dynamics
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Funding
- Columbia River Inter-Tribal Fish Commission through the Columbia Basin Fish Accords
- Bonneville Power Administration [2008-524-00]
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This study used existing western brook lamprey Lampetra richardsoni age information to fit three different growth models (i.e. von Bertalanffy, Gompertz and logistic) with and without error in age estimates. Among these growth models, there was greater support for the logistic and Gompertz models than the von Bertalanffy model, regardless of ageing error assumptions. The von Bertalanffy model, however, appeared to fit the data well enough to permit survival estimates; using length-based estimators, annual survival varied between 0.64 (95% credibility interval: 0.44-0.79) and 0.81 (0.79-0.83) depending on ageing and growth process error structure. These estimates are applicable to conservation and management of L. richardsoni and other western lampreys (e.g. Pacific lamprey Entosphenus tridentatus) and can potentially be used in the development of life-cycle models for these species. These results also suggest that estimators derived from von Bertalanffy growth models should be interpreted with caution if there is high uncertainty in age estimates. (C) 2016 The Fisheries Society of the British Isles
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