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The abundance of large, piscivorous Ferox Trout (Salmo trutta) in Loch Rannoch, Scotland

Alastair Thorne, Alasdair I. MacDonald, View ORCID ProfileJoseph L. Thorley
doi: https://doi.org/10.1101/029801
Alastair Thorne
Marine Scotland, Freshwater Laboratory, Pitlochry, Perthshire, Scotland
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Alasdair I. MacDonald
Marine Scotland, Freshwater Laboratory, Pitlochry, Perthshire, Scotland
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Joseph L. Thorley
Poisson Consulting Ltd., Nelson, British Columbia, Canada
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ABSTRACT

Background Ferox Trout are large, long-lived piscivorous Brown Trout (Salmo trutta). Due to their exceptionally large size, Ferox Trout are highly sought after by anglers while their life-history strategy, which includes delayed maturation, multiphasic growth and extended longevity, is of interest to ecological and evolutionary modelers. However, despite their recreational and theoretical importance, little is known about the typical abundance of Ferox Trout.

Methods To rectify this situation a 16 year angling-based mark-recapture study was conducted on Loch Rannoch, which at 19 km2 is one of the largest lakes in the United Kingdom.

Results A hierarchical Bayesian Jolly-Seber analysis of the data suggest that if individual differences in catchability are negligible the population of Ferox Trout in Loch Rannoch in 2009 was approximately 71 fish. The results also suggest that a single, often unaccompanied, highly-experienced angler was able to catch roughly 8% of the available fish on an annual basis.

Discussion It is recommended that anglers adopt a precautionary approach and release all trout with a fork length ≥ 400 mm caught by trolling in Loch Rannoch. There is an urgent need to assess the status of Ferox Trout in other lakes.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted August 08, 2016.
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The abundance of large, piscivorous Ferox Trout (Salmo trutta) in Loch Rannoch, Scotland
Alastair Thorne, Alasdair I. MacDonald, Joseph L. Thorley
bioRxiv 029801; doi: https://doi.org/10.1101/029801
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The abundance of large, piscivorous Ferox Trout (Salmo trutta) in Loch Rannoch, Scotland
Alastair Thorne, Alasdair I. MacDonald, Joseph L. Thorley
bioRxiv 029801; doi: https://doi.org/10.1101/029801

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