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 419 for “"fish species"”.
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Innovative molecular methods for fish species differentiation
… screening method for various market-relevant fish species have been developed. A DNA microarray was established using a set of 100 universal oligonucleotide probes. DNA probe signal patterns were observed to be speciesspecific, enabling species identification of unknown fish samples by …
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Corydoras aeneus: a diploid-tetraploid fish species complex
Corydoras aeneus is an armoured catfish found in the upper amazon regions of South America. It is a member of the family Callichthyidae. Studies done with this species of fish showed that C. aeneus is a tetraploid with a chromosome number of 132 (Scheel et al. , 1972). Dunham et al. (1980) reported …
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Incipient Speciation in Freshwater Fish Species from Two Isolated Watersheds
… provided suitable habitats (refugia) for relict species that were previously widespread in the northern section of the continent. As the ice sheet retreated, animals and plants were able to return to the once glaciated areas. However, as the glacier retreated, it disrupted the distribution …
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Hypervariable DNA markers and population structure in three fish species
… population genetics method was studied in three fish species by the use of multilocus DNA fingerprinting. Laboratory lines and field caught specimens from Belize and Florida of the clonal species <i>Rivulus marmoratus</i> were examined to determine the relative contributions of mutation and …
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Assessing the effects of anticoagulant rodenticides on non-target fish species
… SYSTEM AT AUTHOR'S REQUEST.] Invasive rat species have negatively affected island ecosystems contributing to the decline and extinction of many endemic species. The eradication of rodents on islands can leads to restoration of native ecosystems. Anticoagulant rodenticides (ARs) have been an …
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Living on the Edge: Conservation of Fish Species at Risk in Canada
Many species in North America range northward and barely into southern Canada. Some of these species are classified as species at risk and afforded legal protection in Canada, yet the decision to protect these populations at the edge of their range is controversial. To determine if edge populations …
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EFFECTS OF ANTIMICROBIAL COMPOUNDS ON EARLY LIFE STAGES OF CANADIAN FISH SPECIES
… pose risks to aquatic organisms, particularly fish. The ecological implications of such exposure remain poorly understood, especially for non-model fish species native to North American freshwater ecosystems. This thesis investigates the lethal and sub-lethal toxicity responses of both legacy …
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EFFECTS OF ANTIMICROBIAL COMPOUNDS ON EARLY LIFE STAGES OF CANADIAN FISH SPECIES
… pose risks to aquatic organisms, particularly fish. The ecological implications of such exposure remain poorly understood, especially for non-model fish species native to North American freshwater ecosystems. This thesis investigates the lethal and sub-lethal toxicity responses of both legacy …
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Upstream passage of small sized fish species - effects of light and hydrodynamics
L'abstract è presente nell'allegato / the abstract is in the attachment
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Food Habits of Dicamptodon Ensatus and Associated Fish Species of Maratta Creek, Washington
… be under competitive stress from the other two species.
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Understanding environmental influences on bioaccumulation of contaminants of emerging concern among fish species.
… of pharmaceuticals and PFAS among fish species. First, I conducted a field study examining uptake of pharmaceuticals by rainbow trout in an urban river, influenced by snowmelt, during summer and fall seasons. I found pharmaceutical concentrations in fish corresponded to levels in …
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Modelling the spatial distribution of three marine fish species in the southern Benguela
Understanding the spatial distribution of species in relationship to climatic and environmental variables is key to conservation and management of important species, as their distribution might change under climate change and variability. Based on presence absence data from scientific trawl …
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Fish species composition, fish sizes and diversity in the Kamutjonga floodplain, Kavango river, Namibia
… ultimately aims to provide information on the fish species composition, fish sizes and species diversity in the Kavango River’s Kamutjonga floodplain as a basis to provide management advice to ensure the sustainable use of the fisheries. The fish species composition and relative abundance were …
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Immune and Endocrine Modulations Associated with Enhanced Plant-Based Protein Diets Within Freshwater Fish Species
… as a protein replacement for marine-derived fish meal (MDFM) has gained momentum with the potential for aquafeed cost reduction, improved growth performance, and reducing exploitation on wild fish stocks. Further, potential health benefits and optimized production performance resulting from …
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An investigation into aspects of consumer preference for some fish species using sensory evaluation techniques.
The attitudes of consumers towards white fish are discussed, and the sensory features of flesh products and their quality are considered. A review of the investigation of fish quality by sensory evaluation and instrumental techniques is presented and the use and analysis of relevant methods of …
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Life History Observations and Determination of Potential Host Fish Species for Chipola Slabshell, Elliptio chipolaensis
<p>North America is home to nearly 300 species of freshwater mussels with approximately 80% being found in the southeastern United States. The Federally threatened species, Elliptio chipolaensis (Chipola slabshell), is considered an endemic species to the Chipola River Basin in the Florida …
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Non-lethal methods for assessing the health and status of fish species of conservation concern.
… perturbations on threatened and endangered species. This dissertation focuses on how a commonly occurring relative of a species of conservation concern can be used as a surrogate species for developing and validating nonlethal methods for studying the ecology and ecotoxicology of endangered …
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Investigating the larval/juvenile notothenioid fish species assemblage in Mcmurdo Sound, Antarctica using phylogenetic reconstruction
Aim: To investigate and identify the species found within the little-known larval and juvenile notothenioid fish assemblage of McMurdo Sound, Antarctica, and to compare this assemblage to the well-studied local adult community. Location: McMurdo Sound, Antarctica. Methods: We extracted genomic DNA …
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The use of bioelectrical impedance analysis for estimating the body composition of various fish species
… of growth and condition is vital for effective fisheries assessments. Biologists have long attempted to estimate condition for their assessments, but a reliable method to nonlethally estimate body composition is lacking. Proximate analysis is the most dependable and accurate method for …
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Impacts of climate and land use change on fish species distributions in the central United States
Species distribution models are useful tools that can be used to evaluate tradeoffs of management and conservation strategies under scenarios of environmental change. Modeling efforts for fish species have largely focused on cold-water, commercial, and recreationally-valued species, even though …
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