Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"Salmo trutta"”.
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Sea trout (Salmo trutta L.) : studies of the River Twyi, South Wales
… benthic macro-invertebrates and juvenile salmonids, through reservoir liming, was studied.
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Mechanisms and consequences of hybridisation between Atlantic salmon (Salmo salar) and brown trout (Salmo trutta)
… externally-fertilising system of Atlantic salmon, Salmo salar, and brown trout, S. trutta, to investigate mechanisms of hybridisation through sperm-egg interactions, much of which is poorly understood. Salmon and trout experience conspecific sperm precedence during in vitro sperm …
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Seasonal habitat use and survival of brown trout (Salmo trutta) in Oatka Creek, Monroe County, New York
Heavy predation by common mergansers during the severe winters of 2013-2014 and 2014-2015 resulted in dramatic brown trout reductions throughout the spring-fed reaches of Oatka Creek in western New York. Management agencies are considering habitat manipulation to reduce the severity of overwinter …
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The study of molecular variation in Atlantic salmon (Salmo salar L.) and brown trout (Salmo trutta L.)
… DNA loci were used here in three studies, one on Salmo salar and two on S. trutta. In the case of S. salar, the survival of native fish and non-natives from a nearby catchment, and their hybrids, were compared in a freshwater common garden experiment and subsequently in ocean ranching, with …
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Lessons to learn from all out invasion: life history of brown trout (Salmo trutta) in a Patagonian River
Brown trout (Salmo trutta) are widely introduced throughout Patagonia, though their distribution and impact in the region remain poorly documented. Life history flexibility, and particularly partial migration play a major role in the ability of this species to adapt to Patagonian rivers. …
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Lessons to learn from all out invasion: life history of brown trout (Salmo trutta) in a Patagonian River
Brown trout (Salmo trutta) are widely introduced throughout Patagonia, though their distribution and impact in the region remain poorly documented. Life history flexibility, and particularly partial migration play a major role in the ability of this species to adapt to Patagonian rivers. …
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Feeding of Hatchery-reared Brown Trout (Salmo trutta L.) In Relation To The Diet In A South Dakota Stream
One thousand five hundred catchable brown trout (17-26 cm) were stocked into the South Fork of the Yellowbank River May 17, 1973. Samples were taken one month apart from May 22, 1973, through October 29, 1973. Fifteen-minute drift samples were collected every hour for 24 hours and trout were …
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Comparison between the subsurface environment of brown trout (Salmo trutta) redd and nonredd sites in two North Carolina streams
The gravel environment of 30 brown trout (Salmo trutta) redds and adjacent nonredd sites in two western North Carolina streams were studied during the incubation period in 1979-1980 and 1980-1981. Intragravel water temperature, dissolved oxygen concentration, and percent oxygen saturation were …
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The effects of environmental complexity upon the aggressive behaviour and growth of juvenile brown trout (Salmo trutta L.) and the carrying capacity of the environment
… behaviour and growth of juvenile brown trout (Salmo trutta L.) and the carrying capacity of the environment. Natural materials and various structures were used to provide environmental complexity. Aggressive interactions were found to be significantly more frequent in simple environments than …
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Environmental factors related to the abundance and distribution of brook trout (Salvelinus fontinalis) and brown trout (Salmo trutta) and seasonal movements of brown trout in selected Virginia streams
… trout (Salvelinus fontinalis), brown trout (Salmo trutta), non-game fish populations and selected physical and chemical parameters were investigated in four streams draining the Blue Ridge Mountains in north-central Virginia during low flow conditions in August, 1981 and 1982. Multiple …
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The population structure of wild Scottish brown trout (Samo trutta L.1758) of Loch Maree, Wester Ross: spatial genetic distribution after population decline
… to characterising the genetic structure of the Salmo trutta population of Wester Ross with the available archived tissues/specimens. The population structure observed will then be analysed so as to examine the effects of the Wester Ross geography and topography upon the trout population’s …
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Ecology of Lake Ontario Brown Trout
… and habitat preferences of brown trout (Salmo trutta) in Lake Ontario. During fall 1980 and spring and fall 1981, the activities of 36 radiotagged brown trout were monitored near the southern shore of Lake Ontario between Port Bay and Point Breeze (Fig. 1). Underwater radio telemetry …
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Sea lice infestation on wild salmonids in the southern part of the Icelandic Westfjords
Laxalús, Lepeophtheirus salmonis og grálús Caligus elongatus, eru náttúruleg sníkjudýr á laxfiskum í sjó. Lýsnar nærast á slímhúð, roði og blóði fiskanna og valda þannig streitu hjá þeim. Þær geta einar og sér valdið dauða fiska séu þær í miklum mæli en geta auk þess borið með sér aðra sýkla. …
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Cormorants and the Loch Leven trout fishery
… conservation and a famous commercial brown trout Salmo trutta fishery, where Great Cormorants Phalacrocorax carbo have been shot in large numbers. This thesis describes the foraging behaviour of cormorants wintering on Loch Leven. It summarises changes in wintering numbers over a 32 year period, …
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Evaluation and Use of Stream Temperature Prediction Models for Instream Flow and Fish Habitat Management
… thermal habitat improvement for brown trout (Salmo trutta) compared to existing conditions. A 7-day/week morning 1 hr release was determined to best concurrently increase occurrence of brown trout optimal growth temperatures (+10.2% mean), decrease 21°C (state standard) exceedances (99% …
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Hydrological aspects of brown trout management in the Selwyn River system, Canterbury, New Zealand
… New Zealand, on management of the brown trout (Salmo trutta) fishery. The project has four main aims: to describe the hydrological characteristics of the Selwyn River system; to outline the streamflow-related requirements of trout; to show how the hydrology of the Selwyn River system affects …
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Assessing the threat of non-native salmonids to Lahontan cutthroat trout recovery in a subalpine watershed
… fish recovery and introductions of non-native salmonids have been implicated in the decline of inland cutthroat trout subspecies. The United States Fish and Wildlife Service has been restocking Lahontan cutthroat trout Oncorhynchus clarkii henshawi in Fallen Leaf Lake, California annually since …
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The response of eel, lamprey and brown trout to conditions associated with barriers to up- and downstream movement under experimental conditions in a flume
… biased in design towards upstream migrating salmonids. Driven partly by more holistic environmental legislation, there is now an increasing interest in other species and life-stages, requiring development of fish passage criteria for multiple species during up- and down-stream migrations. To …
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