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 55 for “"Marine fish"”.
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Relationships between climate, growth and fisheries production in a commercially exploited marine fish
Climate variability can affect fish populations and fisheries production in numerous ways, including inducing measurable fluctuations in fish growth, condition, and fisheries production. Unfortunately, mechanisms driving these linkages are poorly understood for most exploited species, which hinders …
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Community Composition and Function of the Hindgut Microbiome in Seaweed-Eating Marine Fish
… the host. Microbial communities assist the fish host overcome nutritional limitations (e.g., protein, energy and vitamins). It is unclear which taxonomic groups contribute to the break down of dietary macroalgae along the fish gut and how they help overcome these nutritional constraints. …
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Marine fish exploitation during the middle and later Stone Age of South Africa
Marine fish remains are not common in Middle Stone Age (MSA) sites in Africa. There are currently only two known MSA sites with good organic preservation in South Africa that contain marine fish remains in relatively high numbers: Blombos Cave (BBC) and Klasies River main site (KR). Marine fish …
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Modelling the spatial distribution of three marine fish species in the southern Benguela
… to determine the spatial distribution of three marine fish species of commercial interest: Merluccius capensis, Merluccius paradoxus, and Thyrsites atun, on the West and South coasts of South Africa. The modelled distributions reflect the previously determined range and habitats of the two …
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Investigating trophic interactions between parasites and their marine fish hosts using stable isotope analysis
… stable isotope analyses on a broad range of marine fish hosts and their associated copepod and monogenean gill parasites. The study also provides insight into the gill parasite diversity of a number of host species from South African marine waters. Seventeen species of fish hosts, ranging …
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Purification and characterization of the hepatic microsomal monooxygenase system from the coastal marine fish Stenotomus chrysops
… the hepatic microsomes of the untreated coastal marine fish Stenotomus chrysops (scup) by detergent solubilization and column chromatography. Scup cytochromes P-450A, P-450B and P-450E (labeled in order of elution from the first ion exchange column) had distinct spectroscopic properties, …
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e(lasmo)DNA : the role of environmental DNA (eDNA) analysis in marine fish biodiversity assessment, with special focus on elasmobranchs
… for many mobile, and often rare, vertebrates, fish (and particularly shark) detection is inherently difficult. Environmental DNA metabarcoding, based on the retrieval of genetic traces (skin cells, metabolic waste, etc.) naturally released in the environment, is emerging as a non-invasive …
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Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages
The tolerance of marine fish larvae to NH₃, NO₂⁻, NO₃⁻, H⁺, OH⁻, O₂, and CO₂ was investigated using the decrease in first-feeding incidence following a 24-h exposure as the criterion of response. Ten species, all hatched from pelagic eggs collected at sea, were used in the studies: two soleids …
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Ocean acidification: physiological response from fish to cell
… pCO2 levels will elucidate the capacity of marine fish to adapt or acclimate to future climate change scenarios. In this context, the marine fish intestine has an important role in the acclimatisation mechanisms to environmental stressors. Therefore, this Ph.D. thesis aimed to provide new …
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Patterns and causes of population subdivision in the marine environment
… decisions for the management and conservation of marine resources. However, obtaining a precise assessment is particularly challenging since population subdivision results from the interaction of many biological and environmental variables. Here, the patterns of population subdivision that can be …
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Vibrio spp. disinfection and immunization of Cobia (Rachycentron canadum) for the prevention of disease in aquaculture facilities
Cobia (Rachycentron canadum) is a tropical marine fish, with increasing commercial aquaculture importance worldwide. One of the major limitations to intensive aquaculture is disease. Diseases spread rapidly in an aquatic environment and pose a major threat to the development and introduction of new …
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Trimethylamine-N-oxide reduction by alteromonas spp.
… is a nitrogenous compound widely distributed in marine fish and invertebrates. It has long been known that TMAO is reduced by bacteria during the post mortem spoilage of iced marine fish, but the mechanism involved and the physiological role have remained unknown. Studies with Escherichia coli …
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The uptake, distribution, and depuration of ¹⁴C benzene in Northern anchovy (Engraulis mordax) and Striped bass (Morone saxatilis)
… refined products was studied in two species of marine fish, Nature northern anchovy (Engraulis mordax) and juvenile striped bass (Horone saxatilis) were exposed to sub-lethal concentrations of <sup>14</sup>c benzene for 48 hours. Residues in tissues exhibiting a high lipid content (non-metabolic …
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Polonium-210 radioactivity in Lake Mead fish
… has been found at high concentrations in marine fish. One publication reports much lower concentration (on the order of 10{dollar}\sp{-1}{dollar}) of {dollar}\sp{210}{dollar}Po in fresh-water fish compared to salt-water, although the visceral organs were not analyzed. This hypothesis was …
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Characterisation and applications of bacteriocinogenic Isolates from the deep-sea fish microbiome
… thesis work was initially to explore deep-sea fish microbiomes as a source of antimicrobials and their prospective clinical applications. Our hypothesis was that these microbiomes represent some of the last bastions of microbial communities that have been negligibly impacted by human activity …
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Nemo's Plight: Political Economy, Green-Cultural Criminology, and Fish Abuse
<p>Using the Marine Aquarium Fish Trade as a case study, I propose an integrated theoretical framework in green criminology that strengthens the political economic "treadmill of production" theory (see Lynch et al., 2013) by incorporating an analysis of the "cultural grease" that ensures the …
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Do hurricanes and other severe weather events affect catch per unit effort of reef-fish in the Florida Keys?
Severe weather events frequently affect important marine fish stocks and fisheries along the United States Atlantic and Gulf of Mexico coasts. However, the effects of these events on fish and fisheries are not well understood. The availability of self-reported data from two fisheries in a region …
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Incorporación de vitamina C en dietas larvarias y su implicación en el desarrollo de Solea senegalensis
… on the role of an essential micronutrient for marine fish, vitamin C, during the larval stage. The study was carried out using an important aquaculture species, the Senegalese sole. Technologies were developed that allowed controlled dosage and form of presentation of vitamin C. An important …
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