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 43 for “"Fisheries and Aquaculture"”.
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Advancing Fisheries and Aquaculture Management with Machine Learning: Bycatch Risk Prediction and Autonomous Mortality Modeling
… important role in many fields, including ecology and fisheries sciences. Machine learning models offer many advantages over traditional statistical analysis methods, such as being well suited for analyzing large data sets, capable of incorporating multiple data types in a single model, and able to …
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The Insulin-Like Growth Factor-1 (IGF1) System as a Potential Biomarker for Nutritional Status and Growth Rate in Pacific Rockfish (SEBASTES SPP.)
… by environmental factors including the quality and quantity of food, which influences growth via endocrine pathways such as the growth hormone (GH) / insulin-like growth factor somatotropic axis. In several teleost fishes, circulating concentrations of insulin-like growth factor-1 (Igf1) …
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The use of operational harmful algal bloom monitoring systems in South Africa to assess long term changes to bloom occurrence & impacts for aquaculture
… dynamic, productive, high energy environment and is considered to be a generally challenging setting for in-water aquaculture. One of the largest environmental threats to aquaculture are harmful algal blooms (HABs), a natural ecological phenomenon often accompanied by severe impacts on coastal …
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Spatial management of groundfish resources in the Gulf of Maine and Georges Bank
… that overfishing suppresses sustainability and resilience in fish populations. In the 1990s, the National Marine Fisheries Service (NMFS) implemented five large year-round fishery closures in the Gulf of Maine and Georges Bank. These closures are partially protected marine protected areas …
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Winter flounder Pseudopleuronectes americanus stock enhancement in New Hampshire: Developing optimal release strategies
… enhancement, optimal release size, site, season, and condition of cultured, juvenile winter flounder were evaluated.</p><p>To determine optimal release size, the predator-prey size relationship between winter flounder and the green crab, Carcinus maenas, was examined. The number of flounder killed …
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Effects of Avian Predators on Stream Fish Assemblages
… focuses on foraging behavior of kingfishers and great blue herons, and shows that netting and perches can be used to successfully manipulate avian predation pressure. The third chapter uses this technique to examine what effects kingfishers and wading birds are having on stream fish …
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Floodplain Resource Management: An Economic Analysis of *Policy Issues in Bangladesh
… the tradeoffs between floodplain agriculture and fisheries production in the Brahmaputra river basin of Bangladesh, where both sectors are simultaneously affected by floodplain development policies. Our goal is to study the impact of development policies on these two sectors and to identify …
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Management of an Open Access Fishery Through Voluntary Effort Reduction and Optimum Compensation: A Simulation Analysis
… authority may play the role of an arbitrator and also provide assurance that an appropriate compensation will be provided.
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The historical fisheries in the Mediterranean Sea: A reconstruction of trawl gear, effort and trends in demersal fish stocks
<p>An extensive search of historical data sources and publications has been carried out in different countries of the Mediterranean. This lead to the construction of the largest compilation of historical fisheries information existing in the Mediterranean region. The goal first here was to quantify …
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Tracking diet and movement of Atlantic bluefin tuna (Thunnus thynnus) using carbon and nitrogen stable isotopes
… top predators in pelagic ecosystems. Understanding their diet and movements is necessary for proper management, but existing methods are costly and logistically challenging. Naturally occurring stable isotopes have been used to study diet and movement in many aquatic ecosystems and offer a …
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Updated life history and population structure assessment of spiny dogfish, Squalus acanthias, in the Gulf of Maine
… following a nearly ten-fold increase in fishery landings. Because fishing pressure has been shown to affect population dynamics in targeted species, an update of previous life history parameters is warranted to effectively manage the population. Although updated and accurate life history …
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Somatic condition, growth and distribution of Atlantic bluefin tuna (Thunnus thynnus) in the Gulf of Maine
… positive lipid balance following reproduction and subsequent migration to northern latitudes. Commercial fishermen target Atlantic bluefin tuna between June and October, but landings have declined 70% from 2004-2009 suggesting adult bluefin tuna may no longer be utilizing the Gulf of Maine as a …
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The development of a modular integrated recirculating aquaculture system using Porphyra (nori) for the bioremediation of marine finfish effluent
<p>It is crucial for the development of the fish aquaculture industry to be managed in a way that provides a reliable, long term source of products without negatively impacting the environment. The simplest form of integrated multi-tropic aquaculture (IMTA) uses a fed component (e.g. finfish) and …
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Patterns and process during the diversification of the cichlid fishes in Lake Malawi, Africa
… to Lake Malawi constitute one of the most rapid and extensive radiations of vertebrates ever discovered. The objective of this dissertation was to test the assumptions and predictions of several recently published models of cichlid speciation. First, a novel assay of female choice was used to …
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Characterization of the major extrapallial fluid protein of the mollusc, Mytilus edulis: Implications for function
… the EP protein, has been previously isolated and partially characterized. It has been proposed to play an important role in shell mineralization because of its intriguing property of Ca2+ -binding induced self-assembly.</p><p>This dissertation reports on the characterization of the primary …
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Age, growth, and reproductive biology, of the winter skate, Leucoraja ocellata, in the western Gulf of Maine
<p>This study describes the age, growth and reproductive biology of the winter skate, Leucoraja ocellata, in the Western Gulf of Maine. Age was estimated by enumerating annular bands within the vertebral centra. Precision of the age estimates was evaluated using the Index of Average Percent Error …
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Food security, gender roles, and information exchange in the shrimp farming industry of Sri Lanka
… global concern. In Sri Lanka, years of civil war and natural disasters have posed a challenge in terms of decreasing poverty. One of the pathways out of poverty and improved food security is through smallholder aquaculture. With underutilized aquatic resources, the country is well placed to …
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The economic feasibility of introducing aquaculture into traditional farming systems in Arizona
… necessary for analysis. Five fish densities and eight ditch capacities were tested. The production function was estimated using input and yield data. Three functional forms (linear, quadratic and Cobb-Douglas) were examined to determine how well they estimated the production system. Using …
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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 manipulations. Large fish …
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