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 18 of 18 for “"Fish stocking"”.
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Evaluation of Fish Stocking in Southeastern South Dakota Ponds
… owners of 220 ponds which had received hatchery fish. Based on 187 pond owner responses, at most 45 (24%) of the ponds still contained the fishes stocked. Pond dryness and/or winterkill attributed to the failure of 121 (65%) of the ponds. A subsequent field survey of 30 ponds identified fish …
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The presence of amphibian ranavirus in Virginia warm water fish hatchery ponds
… as the causative agents in these declines. Fish stocking from hatcheries provides a unique opportunity for organisms, including infectious diseases, to travel over long distances. Ranavirus was previously found in two ponds at Harrison Lake National Fish Hatchery in Charles City County, …
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Cormorants and the Loch Leven trout fishery
… piscivorous birds and commercial freshwater fisheries are common, and such a perception exists at Loch Leven, a wetland of international importance for nature conservation and a famous commercial brown trout Salmo trutta fishery, where Great Cormorants Phalacrocorax carbo have been shot in …
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Aspectos biológicos ligados à produtividade da pesca nos açudes públicos da área do "Polígono das Secas" - nordeste do Brasil
Study on fishing productivity of some reservoirs in the area of droughts of northeast region of Brazil, correlated with the influence of number of occurences of carnivorous fishes within the same. The data used are provided by the samples of fish production, from twenty reservoirs of the referred …
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The economic feasibility of introducing aquaculture into traditional farming systems in Arizona
… evaluate the economic feasibility of introducing fish culture into irrigated cotton production on farms in central Arizona. The representative farm adopted in this study is a cotton farm described in Arizona Field Crop Budgets, 1994-95. The only adjustment necessary for the farmer to make is to …
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Growth, Survival, and Reproductive Success of Largemouth Bass Stocked with Selected Forage Fishes in South Dakota Ponds
<p>Five fish stocking combinations were evaluated to determine effects of forage availability and geographic location on largemouth bass (Micropterus salmoides) growth, survival, and reproductive success two and three years following stocking. Four forage species stocked with largemouth bass …
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Changes in Diatom Assemblages in Adirondack (NY, USA) Reference Lakes Since Pre-Industrial Times
… regional (e.g. acidification) or local (e.g. fish stocking, liming, seepage of road salt, cultural eutrophication) environmental disturbances. Inferring changes related to climate are difficult due to the possible complexities associated with multiple stressors. Thirty minimally-disturbed …
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A computer simulation model for wastewater management in an integrated (fish production-hydroponics) system
Intensive fish production in a recirculating aquaculture system facility is a complex bioengineering operation involving a sensitive balance among physiological, water quality, and management components of the overall system. Warm and nutrient-rich wastewater discharged from controlled-environment …
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Evaluation of Largemouth Bass and Bluegill Stocking Strategies in South Dakota Ponds
Three fish-stocking methods were evaluated to determine the effects of stocking density and chronology on largemouth bass (Micropterus salmoides) and bluegill (Lepomis macrochirus) survival, growth, and reproductive success during 1983-1985. Two densities of split-stocking largemouth bass with …
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Social network analysis of behavioural interactions influencing the development of fin damage in Atlantic salmon (Salmo salar)
… occurring under different feeding and stocking conditions. Four separate experiments were carried out in which groups of fish were subjected to a long food restriction period (30 days) described in Chapter 2, high (30 kg/m3) or low (8 kg/m3) fish stocking densities (Chapter 3), …
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Nahrungsnetzbewirtschaftung in Mittelgebirgstalsperren
… to eutrophic. Although changing the fishery management only by repeated fish stocking, in combination with implementating size and bag limits for recreational fisheries, is thought to have only limited success, we decided to put this type of "Biomanipulation" into practice. …
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Evaluation of Walleye Fingerling Plants in Lake Darling, North Dakota
… For many years there was a great expansion of fish stocking of native fishes such as walleyes. It was thought then that annual plantings of fry were necessary to sustain a walleye fishery. However, the ineffectiveness of fry planting in lakes to maintain the fish populations has been …
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Do hatchery trucks make happy anglers?: evaluating entrenched assumptions of put-and-take fisheries
Stocking trout to create successful sport fisheries is an irresistible lure to fisheries managers and sport anglers alike, but the implicit assumptions behind this simple process have seldom been questioned or assessed. Using common fisheries monitoring techniques, combined with social surveys, at …
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Factors Affecting Mercury Accumulation in South Dakota Fishes
Mercury (Hg) contamination in South Dakota fishes has become an important issue. In recent years, several lakes in South Dakota have been found to contain fish with elevated Hg concentrations and fish consumption advisories have been issued for Bitter Lake (Day County), Twin Lake complex (Highway …
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Factors affecting growth and condition of stocked rainbow trout in eastern Washington lakes
… inversely proportional to Zmax and rainbow trout stocking density. Both variables explained 51% of the spring lake-to-lake variation in condition factor. Among combined measures (spring and autumn), odonate and calanoid copepod biomass, and odonate density and amphipod biomass were directly …
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Resident fish community impacts on stocked rainbow trout ecology in 15 eastern Washington lakes
… research was to analyze the effects of resident fish communities and lake habitat on energy source use and trophic position of stocked rainbow trout. Stable isotope analysis was used to accomplish this goal, with stable carbon isotope ratios indicating the source of carbon, pelagic or littoral, …
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Assessment of the hatchery kokanee (Oncorhynchus nerka) release program in Lake Roosevelt 2009 -- 2012
<p>This study determined which kokanee stock performed best in Lake Roosevelt, WA: Lake Whatcom, Meadow Creek, or F1 mixed stock. The F1 mixed stock was created by collecting eggs from Lake Whatcom, Meadow Creek and non-marked kokanee that returned to Hawk Creek and raising them to the residualized …