scholarly journals Lake trout (Salvelinus namaycush) spawning habitat in a northern lake: The role of wind and physical characteristics on habitat quality

2016 ◽  
Vol 42 (2) ◽  
pp. 299-307 ◽  
Author(s):  
David T. Callaghan ◽  
Paul J. Blanchfield ◽  
Peter A. Cott
Keyword(s):  
Habitat Quality ◽  
Lake Trout ◽  
Salvelinus Namaycush ◽  
Physical Characteristics ◽  
Spawning Habitat

Evidence of lake trout (Salvelinus namaycush) spawning and spawning habitat use in the Dog River, Lake Superior

2018 ◽  
Vol 44 (5) ◽  
pp. 1117-1122 ◽  
Author(s):  
Nicholas E. Jones ◽  
Michael Parna ◽  
Sarah Parna ◽  
Steve Chong
Keyword(s):  
Habitat Use ◽  
Lake Trout ◽  
Lake Superior ◽  
Salvelinus Namaycush ◽  
Spawning Habitat

Dynamics in Year-Class Strength, Growth, and Calcified-Structure Size of Native Lake Trout (Salvelinus namaycush) Exposed to Moderate Acidification and Whole-Lake Neutralization

1992 ◽  
Vol 49 (S1) ◽  
pp. 102-113 ◽  
Author(s):  
John M. Casselman ◽  
John M. Gunn
Keyword(s):  
Water Quality ◽  
Direct Effect ◽  
Lake Trout ◽  
Calcium Content ◽  
Salvelinus Namaycush ◽  
Ambient Water ◽  
Intraspecific Interaction ◽  
Relative Growth ◽  
Class Strength

Accurate age-interpretation techniques were developed, using scales and otoliths, to examine the role of whole-lake neutralization in the resurgence of a lake trout (Salvelinus namaycush) fishery in Nelson Lake (pH 5.7) near Sudbury, Ontario. Calcified structures and data from 860 lake trout were collected from 1972 to 1987. The population was characterized by the regular cyclic occurrence of strong year classes, which were probably an effect of pulse angling, cyclic food abundance, and possibly intraspecific interaction. The majority (65.8%) of the lake trout caught in the exceptional winter fishery of 1980 (3.3 kg∙ha−1) were in the lake prior to liming in 1975–76. Young lake trout (up to age 4) of the 1975 and 1976 year classes grew bigger and had larger scales than other year classes from 1973 to 1977, coinciding with an increase in hypolimnetic zooplankton, probably related to improved water quality. Otoliths grew significantly larger and more translucent and exceeded relative growth of scales and body for all ages in 1976 (18% greater) and for the 1976 year class, confirming that otolith accretion can come from the ambient water because liming increased the calcium content by 33% that year, the only observed direct effect of the treatment.

Identification of lake trout Salvelinus namaycush spawning habitat in northern Lake Huron using high-resolution satellite imagery

2016 ◽  
Vol 42 (1) ◽  
pp. 127-135 ◽  
Author(s):  
Amanda G. Grimm ◽  
Colin N. Brooks ◽  
Thomas R. Binder ◽  
Stephen C. Riley ◽  
Steven A. Farha ◽  
...  
Keyword(s):  
High Resolution ◽  
Satellite Imagery ◽  
Lake Trout ◽  
Salvelinus Namaycush ◽  
Lake Huron ◽  
Spawning Habitat ◽  
High Resolution Satellite Imagery

Effects of forestry roads on reproductive habitat and exploitation of lake trout (Salvelinus namaycush) in three experimental lakes

2000 ◽  
Vol 57 (S2) ◽  
pp. 97-104 ◽  
Author(s):  
John M Gunn ◽  
Rod Sein
Keyword(s):  
Lake Trout ◽  
Natural Populations ◽  
Fork Length ◽  
Salvelinus Namaycush ◽  
Spawning Habitat ◽  
Trout Population ◽  
Access Road ◽  
Short Term Study ◽  
Opaque Plastic ◽  
Spawning Sites

This study was designed to test the effects of two potential impacts of forest access roads on lake trout (Salvelinus namaycush) lakes in the Boreal Shield ecozone: (i) loss of reproductive habitat through siltation and (ii) increased access and exploitation. During an 9-year study (1991-1999) in Whitepine Lake, access to seven original spawning sites and over 250 alternate spawning sites was progressively removed by covering the substrate with opaque plastic sheeting to simulate siltation. No effects on recruitment of lake trout have yet been detected. Mark-recapture estimates of juvenile (<370 mm fork length) abundance remained high, mean body size did not increase, and emergent alevins continued to be produced from the alternate spawning sites each year. Similar results occurred in a short-term study in Helen Lake. The lack of obvious effects of reproductive habitat loss was in sharp contrast with the rapid and severe effects that fishing pressure exerted on the lake trout population in Michaud Lake where access was improved by construction of a 12-km forest access road. These findings suggest that lake trout can tolerate substantial losses in spawning habitat, but natural populations, particularly in small lakes, must be protected from excessive exploitation.

Decline and Recovery of the Lake Superior Gull Island Reef Lake Trout (Salvelinus namaycush) Population and the Role of Sea Lamprey (Petromyzon marinus) Predation

1980 ◽  
Vol 37 (11) ◽  
pp. 2074-2080 ◽  
Author(s):  
Bruce L. Swanson ◽  
Donald V. Swedberg
Keyword(s):  
Lake Trout ◽  
Lake Superior ◽  
Petromyzon Marinus ◽  
Total Mortality ◽  
Mortality Rates ◽  
Sea Lamprey ◽  
Salvelinus Namaycush ◽  
Steady Increase ◽  
Egg Deposition

The Gull Island Reef lake trout (Salvelinus namaycush) population was one of the few in Lake Superior that was not annihilated by the combined effects of excessive fishing and sea lamprey (Petromyzon marinus) predation. Following control of the lamprey in the early 1960s, this population of lake trout began a slow but steady increase in the average age and numbers of lake trout. Total annual mortality rates for spawning lake trout were 32% for age VI fish, 48% for ages VII–VIII, and 75% for ages IX and older. These total mortality rates included a 7.3% exploitation rate u, a 20% natural mortality n, and annual lamprey-induced mortalities of 6% for ages V–VI, 24%, for ages VII–VIII, and 56% for ages IX and older fish. The estimated number of lake trout eggs deposited annually on Gull Island Reef from 1964 to 1979 ranged from 3.3 million eggs in 1965 to 28 million eggs in 1979, with a mean of 9 million eggs per year. At present levels of lamprey predation, the estimated egg to spawning fish return rate on Gull Island Reef is 0.18%.Key words: lake trout, sea lamprey, survival, population structure, egg deposition

Comparing results of a spatially explicit growth model with changes in the length-weight relationship of lake trout (Salvelinus namaycush) in Flaming Gorge Reservoir

1999 ◽  
Vol 56 (S1) ◽  
pp. 162-169 ◽  
Author(s):  
Chris Luecke ◽  
M William Wengert ◽  
Roger W Schneidervin
Keyword(s):  
Growth Rate ◽  
Habitat Quality ◽  
Lake Trout ◽  
Salvelinus Namaycush ◽  
Spatially Explicit ◽  
Forage Fish ◽  
Potential Growth ◽  
Weight Relationship ◽  
Gorge Reservoir ◽  
Flaming Gorge

We employed a spatially explicit simulation model to assess growth rate potential for lake trout (Salvelinus namaycush) in Flaming Gorge Reservoir, Utah-Wyoming. Late-summer water temperatures and forage fish densities in 168 habitat cells were collected from 1989 to 1996 and were used to estimate the potential growth of lake trout inhabiting each cell. Results of model simulations indicated that habitat quality for lake trout growth had decreased from 1990 to 1993. This decrease in lake trout growth rate potential was related to decreased forage fish densities during this period. Lake trout condition, as measured using length-weight analyses of individuals captured in spring gillnetting surveys, also decreased from the early 1990s to the mid-1990s. The change in the slope of the length-weight relationship was correlated with the proportion of habitat cells containing positive simulated growth rate potentials (r2 = 0.60, p = 0.024). No significant correlation between the sum of growth rate potentials in habitat cells and changes in the slope of the length-weight relationship was apparent. These correlations suggest that spatially explicit models of habitat quality have relevance to the performance of individual organisms functioning in field environments.

Improved interpretation of labelled fish otoliths: a cost-effective tool in sustainable fisheries management

2005 ◽  
Vol 56 (5) ◽  
pp. 705 ◽  
Author(s):  
T. Niva ◽  
P. Keränen ◽  
J. Raitaniemi ◽  
H. M. Berger
Keyword(s):  
Salmo Trutta ◽  
Lake Trout ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Cost Effective ◽  
Salvelinus Namaycush ◽  
Sander Lucioperca ◽  
Alizarin Red ◽  
Brown Trout Salmo Trutta

A total of 222 pairs of alizarin red S (ARS)-labelled and 75 pairs of unlabelled sagittal otoliths from six hatchery-reared species, including Arctic charr (Salvelinus alpinus (L.)), lake trout (Salvelinus namaycush (Walbaum)), salmon (Salmo salar L.), brown trout (Salmo trutta L.), whitefish (Coregonus sp.) and pikeperch (Sander lucioperca (L.)), were used in blind tests to determine whether sawing a 0.4-mm thick slice from the otolith would improve the interpretation of labelled otoliths. The fish were labelled in 1995–2002. Fish age at labelling varied from two weeks to three months, immersion time from three to six hours and concentration of ARS 50–100 ppm. Blind tests were arranged so that sawed slices were contrasted with entire otoliths using stereomicroscope under UV epi-illumination. According to blind tests, the accuracy of interpretation of ARS-labelled otoliths was 97.0% from the slices and 92.3% from entire otoliths. The role of different filters in detecting false marks owing to autofluorescence is discussed. Cost-benefits of the method are discussed briefly.

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