Stunted Lake Trout (Salvelinus namaycush) from the Rocky Mountains

1986 ◽  
Vol 43 (3) ◽  
pp. 608-612 ◽  
Author(s):  
D. B. Donald ◽  
D. J. Alger
Keyword(s):  
North America ◽  
Fish Species ◽  
Rocky Mountains ◽  
National Park ◽  
Lake Trout ◽  
Slow Growth ◽  
Salvelinus Namaycush ◽  
Age At Maturity ◽  
Subalpine Lake ◽  
Males And Females

Lake trout (Salvelinus namaycush) from Sassenach Lake, a subalpine lake in jasper National Park, Alberta, are stunted and grow slower than lake trout from any other known population in North America. Mean weight at age 10 was 125 g and at age 20 was 281 g. The largest fish caught weighed 451 g and was 28 yr old. We attribute the slow growth to the absence in the lake of preferred lake trout foods such as amphipods and other fish species. Males were usually mature at > 75 g, and females were often mature at > 100 g. Fifty percent or more of males and females spawned at age 4 and 7, respectively. The age when [Formula: see text] of females spawn in Sassenach Lake, age 7, was typical for lake trout populations with > 5% but < 40% of the catch older than 10 yr. Thus, age at maturity was not obviously affected by the stunted condition of the population.

Could ecological release buffer suppression efforts for non-native lake trout (Salvelinus namaycush) in Yellowstone Lake, Yellowstone National Park?

2020 ◽  
Vol 77 (6) ◽  
pp. 1010-1025 ◽  
Author(s):  
John M. Syslo ◽  
Travis O. Brenden ◽  
Christopher S. Guy ◽  
Todd M. Koel ◽  
Patricia E. Bigelow ◽  
...  
Keyword(s):  
Yellowstone National Park ◽  
National Park ◽  
Lake Trout ◽  
Survival Rates ◽  
Salvelinus Namaycush ◽  
Native Range ◽  
Yellowstone Lake ◽  
Ecological Release ◽  
Demographic Rates ◽  
Stock Recruitment

Yellowstone Lake in Yellowstone National Park, USA, has the longest ongoing suppression program for non-native lake trout (Salvelinus namaycush) in the western USA. Harvest data from the suppression program, along with data from an assessment program initiated in 2011, was used to estimate lake trout abundance and mortality rates. Abundance and biomass estimates were used to estimate stock–recruitment dynamics, which were inputs to a simulation model forecasting responses to continued suppression. Abundance increased during 1998–2012 when total annual mortality exceeded 0.59 and declined thereafter. The fishing mortality rate required to reduce abundance was 67% greater than predicted by models that used prerecruit survival estimates from the lake trout’s native range. Prerecruit survival in Yellowstone Lake was estimated at four to six times greater than native range survival rates. Simulated abundance continued to decline if recent suppression efforts were maintained. High prerecruit survival in Yellowstone Lake likely illustrates ecological release for an invasive species in an ecosystem containing few predators or competitors and demonstrates the potential pitfalls of assuming equal demographic rates for native and non-native populations.

Genetic diversity in a remnant population of lake trout (Salvelinus namaycush)

2009 ◽  
Vol 87 (7) ◽  
pp. 642-647 ◽  
Author(s):  
Tina M.J. Giroux ◽  
Douglas P. Chivers ◽  
Michael J. Fitzsimmons ◽  
Neil B. Chilton
Keyword(s):  
Genetic Diversity ◽  
National Park ◽  
Sequence Variation ◽  
Lake Trout ◽  
Single Strand Conformation Polymorphism ◽  
Salvelinus Namaycush ◽  
Nucleotide Variation ◽  
Prince Albert National Park ◽  
Conformation Polymorphism ◽  
Remnant Population

Genetic diversity of the remnant population of lake trout ( Salvelinus namaycush (Walbaum in Artedi, 1792)) in Crean Lake was compared with that for two other populations in the Prince Albert National Park (PANP) using single-strand conformation polymorphism (SSCP) and DNA sequencing analyses of two mtDNA genes. Although there was no sequence variation among individuals for nad5, six different nad2 haplotypes were detected. The Crean Lake population had the least number of haplotypes and lowest nucleotide variation. Also, one common nad2 haplotype in Crean Lake was not detected in the other populations. The results suggest that introductions of lake trout from Wassegam Lake into Crean Lake were unsuccessful with respect to the establishment and (or) reproduction of the stocked fish. Conservation of the remnant population of lake trout in Crean Lake is important because it is genetically distinct from other populations within PANP and in adjacent areas.

Response of non-native lake trout (Salvelinus namaycush) to 15 years of harvest in Yellowstone Lake, Yellowstone National Park

2011 ◽  
Vol 68 (12) ◽  
pp. 2132-2145 ◽  
Author(s):  
John M. Syslo ◽  
Christopher S. Guy ◽  
Patricia E. Bigelow ◽  
Philip D. Doepke ◽  
Brian D. Ertel ◽  
...  
Keyword(s):  
Growth Rate ◽  
Population Growth ◽  
Yellowstone National Park ◽  
National Park ◽  
Population Growth Rate ◽  
Lake Trout ◽  
Cutthroat Trout ◽  
Salvelinus Namaycush ◽  
Yellowstone Lake ◽  
Yellowstone Cutthroat Trout

Introduced lake trout ( Salvelinus namaycush ) threaten to extirpate native Yellowstone cutthroat trout ( Oncorhynchus clarkii bouvieri ) in the 34 000 ha Yellowstone Lake in Yellowstone National Park, USA. Suppression (and eventual eradication) of the lake trout population is deemed necessary for the conservation of Yellowstone cutthroat trout. A US National Park Service gill-netting program removed nearly 450 000 lake trout from Yellowstone Lake from 1995 through 2009. We examined temporal variation in individual growth, body condition, length and age at maturity, fecundity, mortality, and population models to assess the efficacy of the lake trout suppression program. Population metrics did not indicate overharvest despite more than a decade of fish removal. The current rate of population growth is positive; however, it is lower than it would be in the absence of lake trout suppression. Fishing effort needs to increase above observed levels to reduce population growth rate below replacement. Additionally, high sensitivity of population growth rate to reproductive vital rates indicates that increasing fishing mortality for sexually mature lake trout may increase the effectiveness of suppression. Lake trout suppression in Yellowstone Lake illustrates the complexities of trying to remove an apex predator to restore a relatively large remote lentic ecosystem with a simple fish assemblage.

scholarly journals Fine-scale acoustic telemetry reveals unexpected lake trout, Salvelinus namaycush , spawning habitats in northern Lake Huron, North America

2017 ◽  
Vol 27 (2) ◽  
pp. 594-605 ◽  
Author(s):  
Thomas R. Binder ◽  
Steven A. Farha ◽  
Henry T. Thompson ◽  
Christopher M. Holbrook ◽  
Roger A. Bergstedt ◽  
...  
Keyword(s):  
North America ◽  
Acoustic Telemetry ◽  
Lake Trout ◽  
Salvelinus Namaycush ◽  
Lake Huron ◽  
Fine Scale ◽  
Spawning Habitats

Cystidicola farionis (Nematoda) as an Indicator of Lake Trout (Salvelinus namaycush) of Bering Ancestry

1983 ◽  
Vol 40 (11) ◽  
pp. 2034-2040 ◽  
Author(s):  
Geoff A. Black
Keyword(s):  
British Columbia ◽  
North America ◽  
Northwest Territories ◽  
Lake Trout ◽  
Appalachian Mountains ◽  
River System ◽  
Salvelinus Namaycush ◽  
Glacial Retreat ◽  
Yukon River ◽  
Cystidicola Farionis

Cystidicola farionis Fischer is widely distributed in fishes in northern North America west of the Appalachian Mountains. The swimbladders of lake trout (Salvelinus namaycush) from 225 localities across North America were examined for the parasite but only those from the Alsek, Coppermine, Flat, Peel, Stikine, Upper Liard, and Yukon River systems were infected with mature nematodes. The ancestors of fishes in these watersheds survived glaciation in a Bering refugiurn. Thus, this strain of C. farionis probably had a refugium in Beringia in the unglaciated parts of the Yukon River system and dispersed from there into northern British Columbia and the coastal mainland of the Northwest Territories during glacial retreat.

Life history differences parallel environmental differences among North American lake trout (Salvelinus namaycush) populations

2010 ◽  
Vol 67 (2) ◽  
pp. 314-325 ◽  
Author(s):  
Jenni L. McDermid ◽  
Brian J. Shuter ◽  
Nigel P. Lester
Keyword(s):  
Life History ◽  
Lake Trout ◽  
Salvelinus Namaycush ◽  
Climatic Conditions ◽  
Age At Maturity ◽  
Life History Variation ◽  
High Productivity ◽  
Variation Range ◽  
Procrustean Analysis ◽  
Impacts Of Climate Change

Lake trout ( Salvelinus namaycush ) exhibit substantial life history variation range-wide and at a local scale. This study addresses two hypotheses that have been proposed to account for this: (i) over the zoogeographic range, climatic conditions are associated with life history differences; and (ii) within smaller geographic regions, physical lake attributes are associated with life history differences. Multivariate statistics (Procrustean analysis and canonical correlation analysis) identified a strong, range-wide association between climate and life history variables. Colder climates were associated with slower prematuration growth, older age at maturity, and increased longevity. Winter conditions were also important; longer, warmer winters were associated with slower prematuration growth, smaller maximum sizes, and increased weight at a standard length of 425 mm. In southern populations, these general trends were further modified by physical lake attributes. High productivity lakes had lake trout with faster prematuration growth and larger maximum sizes; deeper lakes were associated with larger maximum sizes and later ages at maturity; and larger lakes were associated with slower prematuration growth, greater longevity, and larger maximum sizes. This study identifies abiotic variables that should be incorporated into existing lake trout management models, thus extending their applicability range-wide and permitting them to deal with possible impacts of climate change.

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