Hooking Mortality of Lake Trout Angled through the Ice

Dextrase, Alan J.; Ball, Helen

doi:10.1577/1548-8675(1991)011<0477:hmolta>2.3.co;2

Cited by 25 publications

(31 citation statements)

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“…Loftus (1986) reported a mortality rate of 14.9% for 67 lake trout caught while trolling treble-hooked lures on Lakes Huron, Michigan, and Superior. In the only previous study on mortality of lake trout caught through the ice, Dextrase and Ball (1991) reported a 10% mortality rate for 50 lake trout caught with live bait on still lines on Little Raleigh Lake, Ontario.…”

supporting

confidence: 51%

Hooking Mortality of Lake Trout Angled through Ice by Jigging and Set-Lining

Persons

Hirsch

1994

North American Journal of Fisheries Management

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Hooking mortality was determined for 96 lake trout Salvelinus namaycush caught through the ice by jigging and by set‐lining with large dead baits on Gunflint Lake, Cook County, Minnesota, in January 1991. The estimated mortality rate for all released lake trout was 24%; estimated mortality rates for lake trout caught by set‐lining and jigging were 32 and 9%, respectively. Hooking location strongly influenced lake trout mortality. Mortalities of lake trout hooked in the gills or gut, inside the mouth, or in the lip were 36, 29, and 0%, respectively. Seventy percent of the lake trout caught by set‐lining were hooked in the gills or gut, compared with 9% of the lake trout caught by jigging. The lack of mortality for lip‐hooked lake trout suggested that capturing fish from deep water (25–50 ft), handling in cold temperatures (–20 to 20°F), fin‐clipping, and cribbing had little effect on mortality during the study. High hooking mortality rates for lake trout taken by set‐lining suggested that the use of this fishing method should be restricted when management strategies require the release of winter‐caught lake trout.

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supporting

confidence: 51%

Hooking Mortality of Lake Trout Angled through Ice by Jigging and Set-Lining

Persons

Hirsch

1994

North American Journal of Fisheries Management

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“…Therefore, to remain at similar light levels as in summer, lake trout would need to reside in the upper water column during winter. The use of shallow waters (2-7 m) by lake trout was observed during a winter angling study in a similar-sized lake to Lake 373 (Dextrase and Ball 1991), while in a larger lake (*1,700 ha; Gunflint Lake, MN) fish were captured in deeper waters (8-15 m; Persons and Hirsch 1994).…”

Section: Discussionmentioning

confidence: 96%

Seasonal habitat selection by lake trout (Salvelinus namaycush) in a small Canadian shield lake: constraints imposed by winter conditions

et al. 2009

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The need for cold, well-oxygenated waters significantly reduces the habitat available for lake trout (Salvelinus namaycush) during stratification of small temperate lakes. We examined the spatial and pelagic distribution of lake trout over two consecutive summers and winters and tested whether winter increased habitat availability and access to littoral regions in a boreal shield lake in which pelagic prey fish are absent. In winter, lake trout had a narrowly defined pelagic distribution that was skewed to the upper 3 m of the water column and spatially situated in the central region of the lake. Individual core areas of use (50% Kernel utilization distributions) in winter were much reduced (75%) and spatially non-overlapping compared to summer areas, but activity levels were similar between seasons. Winter habitat selection is in contrast to observations from the stratified season, when lake trout were consistently located in much deeper waters ([6 m) and widely distributed throughout the lake. Winter distribution of lake trout appeared to be strongly influenced by ambient light levels; snow depth and day length accounted for up to 69% of the variation in daily median fish depth. More restricted habitat use during winter than summer was in contrast to our original prediction and illustrates that a different suite of factors influence lake trout distribution between these seasons.

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“…The results of harvesting at varying levels were calculated in the model as instantaneous fishing mortality rates. Harvests were restricted to lake trout in the range of 20-61 cm, but the effects of catching and releasing trout greater than 61 cm were simulated with a hooking mortality of 0.15 (Loftus et al 1988;Dextrase and Ball 1991). Within the range of 20-61 cm a generalized gamma function (Henderson and Wong 1991) was used to simulate size selectivity by anglers:…”

Section: Population Modelmentioning

confidence: 99%

Restoration of Lake Trout in Parry Sound, Lake Huron

Reid

Anderson

Henderson

2001

North American Journal of Fisheries Management

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The purpose of this study was to explain how a series of management actions facilitated the restoration of lake trout Salvelinus namaycush in Parry Sound of Lake Huron. Since 1988, the relative abundance of wild spawning lake trout has increased in Parry Sound. Estimates of the spawning population (1994–1997) varied between 16,000 and 29,000 individuals. This increase in abundance was achieved by controlling sea lampreys Petromyzon marinus (1960), stocking yearling lake trout derived from the remnant stock (1981–1997), creating a refuge (1987), restricting harvest by reducing both angling seasons and possession limits (1981), and imposing a size limit for retention (1994). By 1997, the three criteria of successful restoration were achieved, that is, the average age of mature females was 1 year older than the age of first maturation, wild fish composed 50% of the spawners, and the abundance of wild lake trout had been stable or increased for three consecutive years. As a consequence, stocking of yearlings was discontinued after 1997. A stochastic simulation model was developed to assess the likelihood of realizing sustainable harvests over a range of total mortality rates. We concluded that lake trout restoration is possible if sea lampreys are controlled, the appropriate strain is stocked, and exploitation is restricted, although additional limiting factors could hinder rehabilitation success in some locations of the Great Lakes.

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Hooking Mortality of Lake Trout Angled through the Ice

Cited by 25 publications

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Hooking Mortality of Lake Trout Angled through Ice by Jigging and Set-Lining

Hooking Mortality of Lake Trout Angled through Ice by Jigging and Set-Lining

Seasonal habitat selection by lake trout (Salvelinus namaycush) in a small Canadian shield lake: constraints imposed by winter conditions

Restoration of Lake Trout in Parry Sound, Lake Huron

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