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.
Results
Showing 1 to 20 of 40 for “"Agriculture, Fisheries and Aquaculture"”.
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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
… investigates 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 …
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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 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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An Examination of the Basis for Poor Growth Performance in the Hybrid Grass Carp
… due to its poor growth performance and consumption rate. Investigation of the physiology, morphology, behavior, metabolism, and energy budgets of the hybrid and its parental species shows several traits being responsible for the hybrid's deficiency. Intermediacy of activity behavior, …
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Systematics of the stickcatfishes (Farlowella, Loricariidae)
… is a group of 25 species that morphologically and behaviorally mimics sticks and are widely distributed throughout the Amazon, Orinoco, Paraguay, and smaller Atlantic drainages in northern South America, including in the Maracaibo basin of Venezuela. Six species are new to science and are …
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The evolution and benefits of nest association and other reproductive strategies in North American minnows (Cyprinidae)
… behavior. In order to promote understanding of the evolution, behavior and ecology of minnows, a list of minnows for which reproductive behaviors are known was compiled. These behaviors were classified so that the evolution and adaptive advantages of the reproductive strategies could …
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The biosynthesis of brominated tyrosine metabolites by Aplysina fistularis
… ($U$-$\sp{14}$C) -L-3-bromotyrosine, and ($U$-$\sp{14}$) -3,5-dibromotyrosine were incorporated into both dibromoverongiaquinol and aeroplysinin-1, and (methyl-$\sp{14}$C) methionine was specifically incorporated into the O-methyl group of aeroplysinin-1. (Methyl-$\sp{14}$C) …
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Antifreeze Peptides and Glycopeptides in Polar Fishes
… with the relationship of antifreeze peptides and glycopeptides to the processes of osmoregulation and reproduction in polar fishes. Polar fishes, like many marine teleosts, have serum osmolalities which are lower than that of sea water. As a result of being hypoosmotic to sea water, marine …
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Tissue Hypertrophy: A Quantitative Adaptational Strategy During Cold Acclimation in Channel Catfish and Green Sunfish (Immunoelectrophoresis, Heart, Liver, Protein Synthesis, Degradation)
… shown by doubling of hepatosomatic index (HSI) and total liver protein. No change occurs in protein concentration or total liver DNA. The same pattern was observed for heart although the absolute magnitude of hypertrophy was no more than 20-30%.
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Sexual selection, reproductive strategies, and genetic variation in the longear sunfish (Lepomis megalotis)
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Role of 11-ketotestosterone, testosterone, and prolactin in the expression of reproductive behaviors by male bluegill
… involving ""parental"" breeding behavior and precocious maturity involving ""cuckoldry"". Unlike cuckolders, members of the parental life history build nests and provide parental care to the offspring. The research presented in this thesis was performed to elucidate the role of hormones in …
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"Characterization of an antifreeze glycopeptide gene from the Antarctic cod, Notothenia neglecta, and a functional study of the ""pre-"" sequence of this antifreeze glycopeptide"
… its AFGP genes. The structural gene contains 46 tandemly repeated segments, each coding for one mature peptide. Most of the repeats (44) are composed of 51 nucleotides and encode peptides of the AFGP 8 class, but the remaining two are longer (60 nucleotides each) and code for peptides of the AFGP …
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The effects of underwater explosions on fish with techniques to mitigate those effects
… The literature review demonstrated a lack of standardization of methodologies. A number of methodological questions were examined to determine how they affect the ability to compare published studies and the validity of existing mortality models. The review showed that lack of standardization …
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Towards Colombian small-scale marine fisheries management: Hacia un manejo de la pesca marina artesanal en Colombia
<p>Small-scale fisheries are an important economic and social foundation for the livelihood of coastal communities in Colombia. Yet artisanal fishing communities are characterized by a low quality of life and a struggle for the basic components of well being, in part because of inadequate marine …
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Sense of place among New England organic farmers and commercial fishermen: How social context shapes identity and environmentally responsible behavior
… this study aims to strengthen the conceptual and empirical foundations of sense of place, and to determine how sense of place may be linked to environmentally responsible behavior. For this study, five commercial fishermen and five organic farmers from the New England Seacoast region …
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