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Showing 1 to 16 of 16 for “"Escapement"”.
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The effects of temperature, latitudinal origin, and dam escapement on management of muskellunge
… competition, prey availability, habitat, dam escapement, and genetic or latitudinal origin. Much work remains to be done exploring the significance and interaction between several of these variables. My thesis focuses on temperature, source latitude of populations, and dam escapement as …
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Exploring the Dynamics of a Mechanical Watch Lever Escapement using Finite Element Analysis
… simulation of a mechanical watch lever escapement. This was accomplished in four steps: by choosing a reference escapement based on the needs of the study, by executing a reverse engineering methodology to create a lever escapement in computer-aided design (CAD) software, by capturing …
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Determinants for the Timing of Escapement From the Sockeye Salmon Fishery of the Copper River, Alaska: A Simulation Model
… determinants for migratory timing of catch and escapement in a terminal salmon fishery is presented. A method was developed to estimate average seasonal migration rates of salmon through a harvest area from catch and escapement data. The time series for the total population of Copper River …
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Methods for the Comparison of Timing Behavior Applied to the Pink Salmon Fisheries of Prince William Sound, Alaska
… to the timing statistics of catch and spawning escapement. Fixed effects analysis of variance models were examined to analyze differences in mean dates of migration. Multiple comparison analysis, Scheffe's a priori method, correlation, and multiple regression analyses were employed to …
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Invasion Genetics of the Blue Catfish (Ictalurus Furcatus) Range Expansion into Large River Ecosystems of the Chesapeake Bay Watershed
… analyses indicate that a separate scenario, escapement from impoundments, is worth investigating as a substantial source of the expansion. The study has important implications for ecosystem-based management because it is the first application of mixed stock analysis to an invasive species.
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Reassessment of the Red Drum Stock in Mississippi Coastal Waters: The Role of Ages 3-5 Year-Class Fish
… Spawning Stock Biomass Per Recruit (SSBPR) and Escapement Rate (ER) were impacted by the addition of length-at-age data for Red Drum collected by additional methods. Estimates of SSBPR and ER made with model parameters determined from previously collected data were compared to these estimates …
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Life-History Characteristics and Fishery Dynamics of Red Drum (<i>Sciaenops ocellatus</i>), in the North-Central Gulf of Mexico
… estimated the year-specific and year-aggregated escapement rates for the Mississippi stock (years 2004 to 2015), which were sensitive to mortality estimation methods; year-aggregated estimates were 6.9 to 28.2 % depending on the method, but temporal patterns were consistent. I then addressed …
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Dynamics of the atlantic salmon (Salmo salar L.) population of the River Foyle, Ireland
… catches, sport angling catches and spawning escapement. Chapter 3 examines the role of density-dependence in the Foyle salmon population. A Ricker density-dependent model showed that spawning adult population size significantly predicted variation in the resultant filial generation; however, …
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Propagation of Juvenile Freshwater Mussels (Bivalvia: Unionidae) and Assessment of Habitat Suitability for Restoration of Mussels in the Clinch River, Virginia
… 2 treatments may be a reflection of increased escapement in the low-silt treatment, which may have resulted from more frequent disturbance during sampling. Growth of L. fasciola was significantly greater than E. capsaeformis, and was greater in the low-silt treatment. A habitat survey of the …
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Genetic evaluation of American shad Alosa sapidissima restoration success in James River, Virginia
… one-half of the tagged shad were detected at the escapement receiver within 24 hours after tagging, and the average residence times of remaining shad were approximately one week. No tagged shad were detected above Bosher's Dam. These results imply that restricted passage through Bosher's Dam …
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An analysis of the management and economics of salmon aquaculture
… a fixed exploitation rate than under a target escapement policy. The economic performance of open netcage and sea-bag production systems for salmon aquaculture is compared. Netcage systems appear to be more economically profitable than sea-bag systems when environmental costs are either not or …
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Sedimentary legacy of sockeye salmon (Oncorhynchus nerka) and climate change in an ultra-oligotrophic, glacially-turbid British Columbia nursery lake
… knowledge (LTEK) indicated that sockeye escapements were regulated by both harvest and climate over the period of record. The sedimentary record of Kitlope Lake indicated extremely high sedimentation rates, significant inputs of terrestrial organic matter and periphytic diatoms from the …
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Sedimentary legacy of sockeye salmon (Oncorhynchus nerka) and climate change in an ultra-oligotrophic, glacially-turbid British Columbia nursery lake
… knowledge (LTEK) indicated that sockeye escapements were regulated by both harvest and climate over the period of record. The sedimentary record of Kitlope Lake indicated extremely high sedimentation rates, significant inputs of terrestrial organic matter and periphytic diatoms from the …
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Propagation and monitoring of freshwater mussels released into the Clinch and Powell rivers, Virginia and Tennessee
… juvenile culture were controlled, and juvenile escapement was prevented. Juvenile mussels were successfully produced and cultured to stockable size (>15 mm) for release. I released laboratory-propagated mussels at three historically important sites in Clinch and Powell rivers for the assessment …
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Optimal Management Of Biological Populations
… assessment. In this chapter we derive optimal escapement rules for both deterministic and stochastic stage-structured population models. When considering environmental stochasticity, optimal harvest of the pre-reproductive life stage is either more aggressive or more conservative than in the …
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A Comparison Between South Dakota and North American Standard Sampling Gears in Lakes and Reservoirs
… for nets with restricted throats. Subsequent escapement trials confirmed that most Black Crappie and Bluegill escaped from modified fyke nets with unrestricted throats. Together, the paired gear comparisons between SDGFP and Standard gears and additional investigations of Standard gears …