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Permanent link (DOI): https://doi.org/10.7939/R3G73763S

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Diet and Growth of Northern Pike in the Absence of Prey Fishes: Initial Consequences for Persisting in Disturbance-Prone Lakes. Open Access

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Author or creator
Venturelli, P. A.
Tonn, W. M.
Additional contributors
Subject/Keyword
Northern Pike
prey
growth
adaptation
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
The northern pike Esox lucius is a renowned piscivore, but will prey opportunistically on invertebrates (e.g., in small lakes of boreal Alberta, where winterkill can unexpectedly reduce or eliminate prey fishes). We emulated such a disturbance by stocking a fishless lake with northern pike and then monitored their diet and growth over two summers. Stomach content analysis revealed that stocked adults responded to the sudden absence of prey fishes by specializing on energy-rich leeches (families Glossiphoniidae and Erpobdellidae), whereas juvenile offspring consumed a broader mix of invertebrates. Stable isotope analysis supported these results and indicated a relatively rapid drop in the trophic position of stocked adults. Compared with growth of northern pike in regional lakes containing prey fishes, growth of adults in the experimental lake was apparently compromised by a diet of invertebrates but growth of juveniles was high. Although long-term dynamics of northern pike in these disturbance-prone lakes are undocumented, our results suggest that northern pike are capable of adapting rapidly to the absence of prey fishes; however, such a diet imposes a trophic bottleneck that can lead to stunting.
Date created
2006
DOI
doi:10.7939/R3G73763S
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©Copyright by the American Fisheries Society 2006
Citation for previous publication
Venturelli, P. A., & Tonn, W. M. (2006). Diet and Growth of Northern Pike in the Absence of Prey Fishes: Initial Consequences for Persisting in Disturbance-Prone Lakes. Transactions of the American Fisheries Society, 135, 1512–1522.
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File title: Diet and Growth of Northern Pike in the Absence of Prey Fishes: Initial Consequences for Persisting in Disturbance-Prone Lakes
File author: Paul A. Venturelli a & William M. Tonn a
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