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 26 for “"fish distribution"”.
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Exploring physical, biological, and behavioral processes that affect larval fish distribution in the pelagic zone of Lake Michigan
The growth and survival of larval fish are influenced by a suite of biotic and abiotic factors. Because aquatic systems are characterized by strong heterogeneity in biotic and abiotic conditions along a vertical gradient, the vertical distribution of larval fish can profoundly affect their growth …
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Upper Missouri River Basin Aquatic GAP Fish Distribution Model Accuracy Assessment and White Sucker, Catostomus commersonii, Population Characteristics in the Upper Missouri River Basin
Fish species surveys were done at 61 sites in 6 drainages throughout the upper Missouri River Basin. A total of 21,204 fish were collected, representing 42 species and 11 families. Minnows (family Cyprinidae) dominated the catch (77.9%), followed by suckers (family Catostomidae, 6.5%), and …
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The structure and functioning of the fish assemblage of the Humber Estuary, UK
This study provides an assessment of the fish assemblage of the Humber estuary, using a quarterly sampling interval. Sampling 14 subtidal stations throughout the estuary, and two intertidal sites in the outer estuary, the principal aims of the study were to determine the structure and functioning …
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The Importance of Cover and Other Habitat Features to The Distribution and Abundance of Illinois Stream Fishes (Sunfish, Cyprinids)
… changes in habitat structure on the distribution and abundance of stream fishes were assessed using field and laboratory results. Fish distributions in several small Illinois streams were related to the availability of depth and cover features using survey data and cover …
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Composição, distribuição e abundância da ictiofauna da Baía da Ilha Grande (Rio de Janeiro - Brasil)
… were carried out, providing results used in fish distribution analysis. Aside, the study of the 1988 fisheries statistics records, provided by Angra dos Reis Municipality, have shown relative abundance variations of the main fish commercial kinds. It was recorded 134 fish species, distributed …
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Distributions, Assemblage Structure, and Habitat Associations of Fishes in Two Streams of the Red Bird River Watershed, Kentucky
<p>The spatial and temporal variation in fish distribution, assemblage structure, and habitat associations were investigated in relation to the available macrohabitats (riffle, run, or pool) in Gilbert's Big Creek and Elisha Creek, 2nd and 3rd order streams, respectively, located within the Red …
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Linking Prey to Predator: Scale Dependence and Oceanographic Influence in Marine Food Webs
… More accurate and detailed understanding of prey distributions relative to physical and biological features can greatly aid in understanding top predator distributions and ultimately ecosystem functioning. High resolution acoustic data is a critical tool that can be used to investigate food web …
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Lessons to learn from all out invasion: life history of brown trout (Salmo trutta) in a Patagonian River
… 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. Consequently, this study explored habitat, …
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Lessons to learn from all out invasion: life history of brown trout (Salmo trutta) in a Patagonian River
… 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. Consequently, this study explored habitat, …
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Effects of sewage treatment plant effluents on mollusks and fish of the Clinch River in Tazewell County, Virginia
… Clinch River is renown for its rich mollusk and fish assemblages, including many endemic species. New sewage treatment plants (STP's) have recently been constructed along the Clinch River in Virginia, raising concern because of the disappearance of mollusks below existing STP's. Field and …
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Environmental drivers of the abundance and distribution of forage fishes on the Northeast US shelf, with a particular emphasis on northern sand lance
Small pelagic fishes, also termed forage fishes, represent a critical link between secondary production and myriad top predators in marine ecosystems, including the Northeast US shelf. In this dissertation, I analyze the drivers of forage fish distribution throughout the Northeast US shelf and the …
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THE MARKETING AND DISTRIBUTION SYSTEM FOR FRESH FISH IN SOUTH WEST ENGLAND: MODELLING THE EFFECTS OF SUPPLY VARIATION
The distribution system in the fishing industry has attracted little attention from academics in comparison to the catching sector. This realisation came in the early 1980's with questions being raised about system efficiency and the identification of problems. A lack of understanding of the …
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Environmental drivers of the abundance and distribution of forage fishes on the Northeast US shelf, with a particular emphasis on northern sand lance
Small pelagic fishes, also termed forage fishes, represent a critical link between secondary production and myriad top predators in marine ecosystems, including the Northeast US shelf. In this dissertation, I analyze the drivers of forage fish distribution throughout the Northeast US shelf and the …
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Spatial ecology of adult spotted seatrout, Cynoscion nebulosus, in Louisiana coastal waters
… knowledge gap, I examined the movements, distribution, and habitat use of adult spotted seatrout in coastal Louisiana primarily using high-resolution acoustic telemetry and secondarily, conventional tagging (mark-recapture) data. At the largest spatial scale investigated, I found that …
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Ecology of the pelagic fish resources of Lake Tanganyika
Most of the scientific knowledge on the pelagic fish (the clupeids Stolothrissa tanganicae and Limnothrissa miodon and the centropomid Lates stappersii) of Lake Tanganyika is from research carried out in localised areas. This makes it difficult to extend the results to the whole lake. Consequently, …
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Assessing predictive performance and transferability of species distribution models for freshwater fish in the United States
Rigorous modeling of the spatial species distributions is critical in biogeography, conservation, resource management, and assessment of climate change. The goal of chapter 2 of this dissertation was to evaluate the potential of using historical samples to develop high-resolution species …
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The Influence of Habitat Structure and Environmental Variability on Habitat Use By Fish in the Vermillion River, South Dakota
… was initiated to 1) examine the associations of fish with meso- and microhabitat in the Vermillion River, South Dakota, and 2) quantify fish communities in Vermillion River tributaries. Fish were collected from four mesohabitats (riffles, pools, runs, stream areas with woody debris) in natural …
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The Influence of Habitat Structure and Environmental Variability on Habitat Use by Fish in the Vermillion River, South Dakota
… was initiated to 1) examine the associations of fish with meso- and microhabitat in the Vermillion River, South Dakota, and 2) quantify fish communities in Vermillion River tributaries. Fish were collected from four mesohabitats (riffles, pools, runs, stream areas with woody debris) in natural …
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An ecosystem-based approach to balancing cage aquaculture, capture fisheries, and biodiversity conservation in Lake Victoria, Kenya
Lake Victoria is known for its cichlid fish species flock of 500 or more, which have been drastically decreased due to mass extinction. The lake's fisheries transformed from artisanal to industrial, with exotic species displacing the indigenous flock, changes linked to local and global …
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