Survival of Lake Trout Eggs on Reputed Spawning Grounds in Lakes Huron and Superior: in situ Incubation, 1987–1988

Manny, Bruce A.; Edsall, Thomas A.; Peck, James W.; Kennedy, George C.; Frank, Anthony M.

doi:10.1016/s0380-1330(95)71104-2

Cited by 19 publications

(12 citation statements)

References 20 publications

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“…Density-dependence at egg stock sizes in this experiment (which was unexpected because we thought that the number of eggs deployed was not high enough to elicit this response) suggests that large numbers of eggs (millions) may not be required to initiate spawner populations. Survival of eggs to hatch in artificial turf incubators was high (69%) compared with estimates of eggs (1-46%) placed in plexiglass incubators buried at spawning sites throughout the Great Lakes (Casselman 1995;Eshenroder et al 1995;Manny et al 1995) and was more similar to the controls (76-86%) in those studies. Model simulation estimates of survival from egg to age 1 in the wild, which encompasses 16-18 months, are much lower (0.1-0.4%; Ferreri et al 1995).…”

Section: Discussionmentioning

confidence: 74%

Reestablishing a Spawning Population of Lake Trout in Lake Superior with Fertilized Eggs in Artificial Turf Incubators

Bronte

Schram

Selgeby

et al. 2002

North American Journal of Fisheries Management

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Fertilized eggs from lake trout Salvelinus namaycush were placed in artificial turf incubators and deployed on Devils Island Shoal, Lake Superior, in an attempt to reestablish a spawning population on this once important spawning area. Efficacy was measured by the changes in catch rates, age composition, and origin of adult lake trout returning to the shoal in the fall in subsequent years. The abundance of lake trout spawners without fin clips, which implies that these fish hatched in the lake, increased throughout the sampling period, whereas the abundance of hatchery‐reared fish (indicated by one or more fin clips) stocked for restoration purposes remained low. Year‐class‐specific stock–recruitment analysis suggested that the recruitment of unclipped spawners was related to the number of eggs planted in previous years rather than to spawning by the few adult lake trout visiting the reef. Increases in adult fish at Devils Island Shoal were independent of trends at adjacent sites, where unclipped spawner abundances remained low. Enhanced survival to hatch and apparent site imprinting of young lake trout make this technique a viable alternative to stocking fingerling and yearling lake trout to reestablish spawning populations on specific sites in the Great Lakes.

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Section: Discussionmentioning

confidence: 74%

Reestablishing a Spawning Population of Lake Trout in Lake Superior with Fertilized Eggs in Artificial Turf Incubators

Bronte

Schram

Selgeby

et al. 2002

North American Journal of Fisheries Management

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“…We postulated that protection of demersal lake sturgeon eggs and fry from predation and dislocation would be provided by 30 cm or more of interstitial space present among bottom substrates because that interstitial depth has been found to protect demersal lake trout ( Salvelinus namaycush ) eggs (Edsall et al., 1992) that are larger in diameter than and lack the sticky coating possessed by lake sturgeon eggs (Scott and Crossman, 1973). We further reasoned that successful development and hatch of lake sturgeon eggs and fry would be reduced in proportion to the amount of silt and decomposing organic matter present on the spawning substrates because the latter would reduce dissolved oxygen available for egg and fry survival (Manny and Edsall, 1989; Manny et al., 1995). Owing to the lack of any data on survival of lake sturgeon eggs and fry at our constructed beds, we could not relate the composition and arrangement of bottom substrates or the relative amount of silt and decomposing organic matter on such substrates to the survival of lake sturgeon eggs or fry at these three beds.…”

Section: Discussionmentioning

confidence: 99%

Lake sturgeon response to a spawning reef constructed in the Detroit river

Roseman

Manny

Boase

et al. 2011

Journal of Applied Ichthyology

108

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SummaryPrior to the First World War, the bi-national Detroit River provided vast areas of functional fish spawning and nursery habitat. However, ongoing conflicting human uses of these waters for activities such as waste disposal, water withdrawals, shoreline development, shipping, recreation, and fishing have altered many of the chemical, physical, and biological processes of the Detroit River. Of particular interest and concern to resource managers and stakeholders is the significant loss and impairment of fish spawning and nursery habitat that led to the decline in abundance of most fish species using this ecosystem. Lake sturgeon (Acipenser fulvescens) populations for example, were nearly extirpated by the middle of the 20th century, leaving only a small fraction of their former population. Fisheries managers recognized that the loss of suitable fish spawning habitat is a limiting factor in lake sturgeon population rehabilitation in the Detroit River. In efforts to remediate this beneficial water use impairment, a reef consisting of a mixture of natural rock and limestone was constructed at the upstream end of Fighting Island in 2008. This paper focuses on the response by lake sturgeon to the different replicates of suitable natural materials used to construct the fish spawning habitat at Fighting Island in the Detroit River. Pre-construction fisheries assessment during [2006][2007][2008] showed that along with the presence of adult lake sturgeon, spawning conditions were favorable. However, no eggs were found in assessments conducted prior to reef construction. The 3300 m 2 Fighting Island reef was placed at the upstream end of the island in October of 2008. The construction design included 12 spawning beds of three replicates each consisting of either round rock, small or large (shot-rock) diameter limestone or a mixture thereof. An observed response by spawning lake sturgeon occurred the following year when spawning-ready adults (ripe), viable eggs, and larvae were collected during May and June 2009. Additional eggs and spawning-ready adults were found in 2010 (no larval sampling occurred in 2010) as well as collection of three age-0 juvenile lake sturgeon in bottom trawls fished downstream of the reef during July 2010. Spawning lake sturgeon showed no repeatable preference for any of the four particular substrate types but showed a high degree of preference for the island side of the channel, where faster water current velocities occurred. In 2009, overall lake sturgeon egg densities across all replicates averaged 102 m and seven larvae were found in night drift-net samples. In 2010, average lake sturgeon egg density was 12 m )2 and three age-0 lake sturgeon averaging 120 mm TL were collected in bottom trawls in deepwater (8 m depth) downstream from the constructed reef. These results demonstrated successful reproduction by lake sturgeon on a man-made reef and suggested that additions and improvements to fish spawning habitat could enhance reproduction and early life history survival of lake sturgeon in ...

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“…Salmonid eggs can be killed by burial in sediment or from hypoxic conditions resulting from decomposition of organic matter in sediment (Sly, 1988;Ventling-schwank & Livingstone, 1994;Casselman, 1995;Manny et al, 1995). The distribution of lake trout and other salmonids is limited by oxygen availability (Ryan & Marshall, 1994) and hypoxia has been implicated as a major factor responsible for recruitment failure of lake trout and other salmonids in other lakes undergoing eutrophication (Tanner, 1952;Casselman, 1995;Cornelius et al, 1995;Manny et al, 1995;Noakes & Curry, 1995;Evans et al, 1996). During fertilization of Lake N1, high deposition of organic matter onto the spawning grounds may have resulted in increased biological oxygen demand and subsequent death of overwintering lake trout eggs.…”

Section: Discussionmentioning

confidence: 99%

Effects of a Whole-lake, Experimental Fertilization on Lake Trout in a Small Oligotrophic Arctic Lake

et al. 2005

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We tested whether increased phosphorus and nitrogen concentrations would affect a lake trout (Salvelinus namaycush) population in a small oligotrophic lake with a benthically dominated food web. From 1990 to 1994, nitrogen and phosphorus were added to Lake N1 (4.4 ha) at the arctic Long-Term Ecological Research site in Alaska. We used mark/recapture methods to determine the lake trout population size, size structure, recruitment, and individual growth from 1987 to 1999. Data were also collected on water chemistry and food availability. Fertilization resulted in increased pelagic primary productivity, chlorophyll a, turbidity, snail density, and hypoxia in summer and winter. Lake trout density was not affected by the manipulation however growth and average size increased. Recruitment was high initially, but declined throughout the fertilization. These results suggest that lake trout were affected through increased food availability and changes to the physical characteristics of the lake. During fertilization, hypoxia near the sediments may have killed over-wintering embryos and decreased habitat availability. Although lake trout responded strongly to increased nutrients, loss of recruitment might jeopardize lake trout persistence if arctic lakes undergo eutrophication.

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Survival of Lake Trout Eggs on Reputed Spawning Grounds in Lakes Huron and Superior: in situ Incubation, 1987–1988

Cited by 19 publications

References 20 publications

Reestablishing a Spawning Population of Lake Trout in Lake Superior with Fertilized Eggs in Artificial Turf Incubators

Reestablishing a Spawning Population of Lake Trout in Lake Superior with Fertilized Eggs in Artificial Turf Incubators

Lake sturgeon response to a spawning reef constructed in the Detroit river

Effects of a Whole-lake, Experimental Fertilization on Lake Trout in a Small Oligotrophic Arctic Lake

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