Kootenay Lake kokanee (Oncorhynchus nerka) collapse into a predator pit

Kootenay Lake is a large, oligotrophic waterbody in southern British Columbia renowned for recreational fisheries for piscivorous rainbow trout (Oncorhynchus mykiss) and bull trout (Salvelinus confluentus). Long-term datasets showed an increase in large-bodied (>2 kg) piscivore abundance followed...

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Bibliographic Details
Published in:Canadian journal of fisheries and aquatic sciences 2022-02, Vol.79 (2), p.234-248
Main Authors: Warnock, Will G, Thorley, Joseph L, Arndt, Steven K, Weir, Tyler J, Neufeld, Matthew D, Burrows, Jeff A, Andrusak, Greg F
Format: Article
Language:English
Subjects:
Behavior
Bioenergetics
Biomass
Consumption
Environmental aspects
Fish populations
Fisheries
Fishery management
Juveniles
Lakes
Oncorhynchus mykiss
Oncorhynchus nerka
Population decline
Predation (Biology)
Predators
Prey
Protection and preservation
Rainbow trout
Salmon
Salvelinus confluentus
Sockeye salmon
Statistics
Thinning
Trout
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Summary:Kootenay Lake is a large, oligotrophic waterbody in southern British Columbia renowned for recreational fisheries for piscivorous rainbow trout (Oncorhynchus mykiss) and bull trout (Salvelinus confluentus). Long-term datasets showed an increase in large-bodied (>2 kg) piscivore abundance followed by a collapse of the kokanee (Oncorhynchus nerka) prey population in 2013 and subsequent decline of large-bodied piscivores. An unprecedented post-collapse state formed in 2015–2018, characterized by low kokanee spawner abundance and biomass and high catch rates for small-bodied (
ISSN:0706-652X
1205-7533
DOI:10.1139/cjfas-2020-0410