Bou Mira, Marta

The aim of the present thesis is directed towards the comprehension of the mechanisms involved in the regulation of lipid and carbohydrate metabolism in relevant species in European aquaculture. Special attention has been placed on adipose tissue due to its key role in the control of the overall energy homeostasis and its endocrine functions. Six diets were formulated to determine the feasibility of replacing dietary lipids (from 23 to 17%) by starch (from 12 to 28%) and subsequent replacements ...

Olajos, Fredrik

The age of natural populations is crucial information when studying processes like extinction,colonization, adaptation and evolutionary divergence. Here I evaluate if DNA in lakesediments can be used to date the colonization by whitefish (Coregonus lavaretus) in lakes incentral Sweden. Three species-specific primer pairs were designed to detect the presence orabsence of whitefish DNA in sediments from lake Hotagen where I hypothesized thatwhitefish colonized before 1790 but long after the ice-me...

Karczmarz, Veronika

Bottlenose dolphins (Tursiops truncatus) kept in zoos and dolphinarias rarely get an outlet for their echolocation abilities as their pool environment is often quite barren. Not much research has been carried out on enrichments promoting echolocation for dolphins in human care. In the present study a setup with live fish was compared to a setup with air-filled floats (providing strong sonar targets, similar to the swim bladders of large fish) and a control setup. A PCL (porpoise click logger) wa...

Messa, Sebastian

Prior studies suggest that proximity to nuclear power plants do not affect concerns regarding perceived risks of nuclear power. This thesis applies and compare Swedish plant Ringhals with prior studies but with the added intent of addressing the relationship between plant and population. The host community Bua is positive towards Ringhals and the changes it has brought. To some degree more so than results of prior studies with a higher than national average percent of study respondents being in ...

Lehrter, Richard J., II

Master of Science / Department of Biology / Martha E. Mather / Understanding the empirical relationships between biotic diversity and components of the environment is crucial for effective research and management, particularly in highly disturbed watersheds. The Smoky Hill River is a semi-arid prairie stream with a historic native fish community that is adapted to the extreme and highly variable climatic and hydrological conditions characteristic of the Great Plains streams. Following a literatu...

Jehangir, Maryam

Orientador: Cesar Martins / Resumo: B chromosomes (Bs) are additional to the standard regular chromosome set (As), and present in all groups of eukaryotes. A reference genome is key to understand genomics aspects of an organism. Here, we present the de novo genome assembly of the cichlid fish A. latifasciata: a well known model to study Bs. The assembly of A. latifasciata genome has not been performed so far. The main focus of this study is to analyze and assemble the A. latifasciata genome with...

Robinson, Melissa Aubrey

This thesis documents the grammatical processes and semantic impact of innovative ways to pejoratively reference individuals through adjectival nominalization. Research on nominalized adjectives suggests that when meanings shift from having one property (1) to becoming a kind with associated properties (2), the noun form often encodes stereotypical attributes: [1] "Her hair is blonde." (hair color); [2] "He married a blonde." (female, sexy, dumb). Likewise, the linguistic phenomenon of generici...

Benevides, Lara

The many technological processes that products go through can make consumers less related to the systems behind them and their origins. The same thing happens to food. This project highlights the implications of a food system within the global scale of today’s mainstream economy and explores the possibilities for a product that originates from a more sustainable food system. Apart from re-designing a processed everyday food product, the aim of this study is to increase awareness of the pressure ...

Nathan, Vinay

This thesis deals with computing the pressure distribution around a swimming slender fish and the thrust generated by its flapping motion. The body of the fish is modeled as a missile like slender body to which a tail is attached that is modeled as a swept wing. The tail is attached to the tip of the slender body and maintains its slope with it. The motion for the swimming fish is prescribed. The fluid flow is modeled as an unsteady potential flow problem with the flow around the slender body mo...

Skaring, Ida

Pharmaceuticals, enter the aquatic environments through sewage treatment plants and may affect fish. This examination paper is a literature study that focuses on Selective serotonin reuptake inhibitors, SSRIs, exposure and the impacts on teleosts in the Baltic Sea by assessment of peer-reviewed literature and material. Teleosts affected by exposure of these substances may demonstrate physiologically as well as behavioral alterations. These can be observed as alterations in aggression, boldness, ...

abstract: The omega-3 fatty acids in fatty fish and fish oil, eicosapentanoic acid (EPA) and docosahexanoic acid (DHA), have been associated with a reduction in risk for cardiovascular disease. Blood type is a known contributor to risk for cardiovascular events. This study evaluated the effect of fish oil supplements on cardiovascular risk markers in adults with blood types A or O. An 8-week parallel-arm, randomized, double-blind trial was conducted in healthy adult men and women with either blo...

abstract: Teleosts have the most primitive adaptive immune system. However, in terms of functionality the teleost immune system is similar to birds and mammals. On the other hand, enteric bacterial pathogens of mammals and birds present conserved regulatory mechanisms that control virulence factors. In this context, deletion of conserved genes that control virulence factors have been successfully used as measure to construct live attenuated bacterial vaccines for mammals and birds. Here, I hypot...

Sagouis, Alban

Les lacs sont des écosystèmes majeurs par leurs connexions aux écosystèmes lotiques et par leurs échanges avec les écosystèmes terrestres qui les entourent. Ils constituent une ressource importante pour l’homme en fournissant eau potable, nourriture et énergie. Les conditions environnementales des lacs structurent leur communauté mais les activités anthropiques telles que l’agriculture les perturbent et les structurent. Les situations où plusieurs pressions – notamment l’eutrophisation et les es...

Taylor, Geraldine Claire

Expected release date-May 2019

Dyer, Alexander

Local, niche-based processes, which arise from the interplay between biotic interactions and abiotic constraints are considered to be important regulators of community structure. However, it is increasingly recognised that patterns of diversity can also be strongly influenced by dispersal-driven processes. While empirical research on the diversity of coral reef fishes on shallow tropical reefs has contributed greatly to the development of general concepts in ecology, there have been considerably...

Stefanus, Titania Vaida

Thesis (MTech (Business Administration))--Peninsula Technikon, Cape Town, 2002 / The growing and declining demand of the different fish oil application markets. The price of heavy furnace oil compared to fish oil selling price. (Heavy furnace oil is used to generate energy) . The research also investigated the impact of low price fish oil substitutes on the South African fish oil producers. The most important substitute in the current South African majority market, the animal feed market,...

Currie, Jock

Accurate interpretation of recent variability observed in fish populations, species compositions, distribution ranges or ecological indicators, depends on knowledge of their past dynamics and historical states. The onset of systematic fisheries data collection typically lagged decades or even centuries behind modern fishing exploits. As a consequence, pre-disturbed reference points and descriptions of subsequent change are rarely available. A remarkably detailed set of historical trawl survey da...

Potts, Warren Mason

The fish populations in small southern African reservoirs are largely unexploited and there is potential for fisheries development. However, the development of sustainable fisheries requires reliable estimates of potential yield or production. Empirical models that have been developed to predict fish production only apply to large water bodies and only predict total fish production, not the production of individual species. Small reservoirs generally have few commercially important species and t...

Archibald, Robert Eldred Mostert

This report on the diatoms (Bacillariophyta) of the Sundays and Great Fish rivers is divided into two sections. In Volume 1 the taxonomy of the diatoms from these two river systems is examined. A total of 331 taxa were studied, of which 5 are described as new species. Two taxa are given new names, since they were previously known under later homonyms. Twenty seven taxa were recorded for the first time from South Africa, while a number of species are given amended descriptions in the light of fre...

Toyohara, Haruhiko

Kyoto University (京都大学) / 0048 / 新制・課程博士 / 農学博士 / 甲第3123号 / 農博第408号 / 新制||農||385(附属図書館) / 学位論文||S59||N1476(農学部図書室) / UT51-59-D228

Wong, Pak Ki

No description available.

Leggatt, Rosalind Alexandra

Glutathione (GSH) is a ubiquitous antioxidant involved in many cellular processes in mammals. In contrast, fish have relatively low GSH levels, as well as low turnover and activity of associated enzymes. As the metabolism and function of GSH have been poorly studied in fish, I examined the mechanisms by which fish tissues transport GSH, the influence acclimation temperature and growth rate have on GSH dynamics, and the importance of GSH during heat stress in fish to elucidate the differing roles...

Brown, Kimberly Linkous

Fisheries regulations, implemented in the 1880s, banned the sale of Indian 'food fish' and resulted in the creation of the categories of "food fishing" and "commercial fishing." While simultaneously accepting and rejecting that place in the margins of this fractured fishery, Stó:lō people have consistently maintained that their Aboriginal right to fish cannot be cast in these false categories that separate the economic and social components of their way of life. Stó:lō fishers have been fi...

Gao, Haijun

BACKGROUND: The association between subsets of male infertility, oligoasthenoteratozoospermia (OAT), obstructive azoospermic (OA), non-obstructive azoospermia (NOA), and increased risk of having chromosomal abnormalities in the sperm has not been investigated. Chromosomal aneuploidy in sperm will be systematically investigated by standard methods with large sample sizes required to present significance. METHODS: Triple colour FISH analysis of chromosomes 18, X and Y and dual colour FISH an...

Ben Hasan, Abdulrahman

When fish catches decline, the standard recommended management solution is to reduce fishing mortality to allow stock recovery to more productive levels. This recommendation is based on the assumption that the most likely cause of the decline in the first place is fishing. Natural regime shifts and human-induced environmental changes are, however, often equally important factors in driving catch declines. In the Northern Persian Gulf, many commercial fish stocks are declining, raising questions ...

Furey, Nathan B

Migrations are utilized across taxa to exploit spatiotemporal variability across landscapes. The benefits of migrations are balanced with costs, and understanding the factors that limit migratory success is needed for proper management and conservation. Sockeye salmon (Oncorhynchus nerka) are of economic, cultural, and ecological importance and undergo downstream migrations from natal freshwater systems through rivers to the ocean as juvenile smolts. In this thesis, I describe a series of studie...

Alker, Kevin Godfrey

Planning is concerned with understanding and relating both the physical and social aspects of an environment and arriving at alternatives which best satisfy the public for whom the resource is being managed. To plan so that maximum benefits are derived it is important to weigh benefits and costs to determine the feasability of an alternative. However, public recreation is an area which operates outside the market mechanism and therefore methods using other than monetary measures must be develope...

Coolidge, Emily Hayes

Numerous studies have determined approximate locations of chemoreceptive cells in freshwater fish, with the majority suggesting the gills as the primary oxygen-sensing site. Using immunohistochemistry, I investigated the distribution of neurotransmitters and markers for neuroepithelial cells (NECs), the putative oxygen sensing cells, in gills of freshwater fish with varying degrees of hypoxia tolerance. I compared the patterns of immunoreactivity of NEC markers (anti-serotonin and anti-syna...

Reiss, Aya Elaine

The role of ecosystem subsidies from fishless, headwater streams for downstream fish populations was investigated through multiple approaches in the coastal temperate rainforest of British Columbia. Terrestrial invertebrate samples were collected in two streams of differing canopy (broadleaf and coniferous) on a weekly basis to assess seasonal (spring to fall) terrestrial inputs to headwater streams. Thirty-four fishless headwater streams were also sampled for both drift and terrestrial inp...

Murray, Sonia Bennett.

In order to manage and protect natural resources it is important to understand local ecological processes and to assess potential risks. I studied the effects of environment on fish assemblage structure and assessed the potential risk of acidic deposition from oil and gas development in northeastern British Columbia (BC) in order to inform future management decisions. This project was part of a cumulative impact assessment project initiated by Treaty #8 First Nations in northeastern BC. They are...

Dean, Susan

This study was undertaken to assess the use of carbon and nitrogen stable isotope analyses as methods to identify source host fish populations of sea lice, Lepeophtheirus salmonis. The delta carbon signatures of parasitic copepodid sea lice used to infect cultured Atlantic salmon in the laboratory were found to be statistically indistinguishable from the delta carbon signatures of blood (ANOVA, p = 1.000) and mucus (ANOVA, p = 0.430) sampled from the wild pink salmon population from which t...

Elliott, Stephen Benjamin

The dorsodorsal division (DD) of the teleost telencephalon has been implicated in memory processes similar to those associated with the mammalian hippocampus. The network connectivity and neural activity underlying this involvement have remained unclear. This thesis attempts to elucidate both. Attempts have been made to record the neural activity of DD neurons, but none have succeeded in correlating the recorded firing with any meaningful stimuli. In this thesis, I present single-unit electrophy...

Waye, Andrew

Common observations of reduced gonad size and spawning inhibition in wild and laboratory raised fish exposed to pulp mill effluents indicate that reproductive neuroendocrine signalling pathways may be upset. This thesis supported the neuroendocrine disruption of reproduction hypothesis by identifying potential disruptors and targets where these impacts may occur. A mechanistic study of the in vivo fathead minnow (FHM) spawning assay used by industry to assess effluent quality showed that ovulati...

Jeffrey, Jennifer D

In teleost fish, the main glucocorticoid stress hormone, cortisol, is released via the hypothalamic-pituitary-interrenal (HPI) axis. This thesis examined the premise that social status, maternal experience, and reproductive status affect HPI axis function in fish. Social stress in juvenile rainbow trout (Oncorhynchus mykiss) chronically elevates circulating cortisol levels. In this thesis, social subordinance as well as exogenous cortisol treatment resulted in decreased plasma adrenocorticotr...

Al-Habsi, Aziz

Statins and fibrates are the most widely used pharmaceuticals in developed countries for the treatment of hyperlipidemia. They reach the aquatic environment mainly via wastewater treatment plants and have been detected at concentrations of ng to µg/L. They are “pseudopersistent” due to their continuous and increasing input into the aquatic environment. Cholesterol is essential to all animals, so inhibition of its synthesis by these drugs could have negative consequences in non-target species. Cu...

Jun, Jaeyoon James

Animals must sense their surroundings to update their internal representations of the external environment, and exploratory behaviours such as sensory sampling are influenced by past experiences. This thesis investigates how voluntary sensory sampling activities undergo learning-dependent changes. Studies of freely behaving animals impose two major challenges: 1) the accuracy of biological measurements is compromised by movement-induced artifacts, and 2) large degrees of freedom in unrestrained ...

Thomson, Douglas Edward

This research reports on the determination of the effects of fish size and feed pellet size on the settling characteristics of Rainbow trout (Salmo gairdneri) culture, tank cleaning wastes. Flocculant particle settling curves (Type II) were developed from settling column analysis of cleaning wastes from 11-311 gram Rainbow trout fed a moist pellet diet (Oregon Moist Pellet ®). Four feed pellet sizes were investigated: 3/32, 1/8, 5/32 and 3/16 inch. Overall non-filterable residue removal curves...

Yu, Zhanle

L'instabilité du drapeau et la nage des poissons sont deux des problèmes d'interaction entièrement couplés fluide-structure. Ils peuvent être considérés comme l’ interaction entre la structure déformable (plaque) et un écoulement de grand nombre de Reynolds. Si la plaque est allongée (petit rapport d’aspect), la théorie du corps élancé (Lighthill 1960) applique pour calculer la force de pression exercée sur la plaque par le fluide. Alors que pour une plaque avec une très grande envergure (grand ...

Hunsaker, Walter George

A series of four feeding tests, involving a total of 610 poults, was conducted to study fish meal and dried brewers' yeast as sources of unidentified factors required by turkey poults for maximum growth. A corn-soybean oil meal ration, supplemented with all known vitamins, was used as a basal ration. Wheat was substituted for corn in two tests. The poults were reared in batteries on wire screen floors for the duration of each test. The addition of 5 per cent fish meal to the all-vegetable ratio...

Smith, Stuart Boland

The logarithmic scale/body relationships of Kamloops trout has been discussed with particular reference to its use in the calculation of fish lengths prior to capture. Growth of scales relative to body growth exhibits strong positive heterogony in the fork length range 3.5 cm. to 4.5 cm., above which the scale/body ratio is isometric. Calculation of fish lengths, using only the diameter of the first growth ring (placode) of the scale and total scale diameter, shows close statistical agreement wi...

Keenleyside, Miles Hugh Alston

Several species of fish swim upstream into the area of greatest turbulence in artificially created currents of water. This reaction is most pronounced with young salmon and trout. Treatment with thyroxine, testosterone and three oestrogen compounds slightly increases the rate at which coho and sockeye salmon smolt jump upstream over a dam. Elevated temperatures increase the amount of negative rheotaxis shown by chum fry and coho smolt in circular currents. / Science, Faculty of / Zoology, Depa...

Miura, Taizo

Early life history, distribution, movement, food habits and interspecific relations of five inshore species, largescale sucker (Catostomus macrocheilus), northern squawfish (Ptychocheilus oregonense), peamouth chub (Mylocheilus caurinum), red side shiner (Richardsonius balteatus), and prickly sculpin (Cottus asper), have been studied during the summers of 1959 - 1961 in Nicola Lake, British Columbia. Analyses were based on specimens periodically sampled with three types of seine nets from variou...

Behrisch, Hans Werner

The regulatory properties of fructose 1,6-diphosphatase (FDPase) from liver of rainbow trout (Salmo gairdneri), South American lungfish (Lepidosiren paradoxa) and migrating pink salmon (Oncorhynchus gorbuscha) were examined over the physiological temperature ranges of the organisms. In rainbow trout saturation curves for substrate (fructose 1,6-diphosphate), and a cofactor (Mg²⁺ ) are sigmoidal, and the evidence suggests cooperative interaction between the binding sites for these ligands. The a...

Haxton, Tim

The impacts of waterpower management on select fish in the Ottawa River are examined in this study and are presented in four manuscripts: (1) a systematic review of published literature on water power management; (2) examining potential causes of variation in lake sturgeon abundance among river reaches; (3) community structure and abundance among water management regimes; and (4) evaluating the predictive power of a lake sturgeon habitat suitability model at multiple scales. (1) Three meta-analy...

Mileva, Gerri

The electrosensory lateral line lobe (ELL) is the first order electrosensory processing station in the brain of the electric fish Apteronotus leptorhynchus, and is the only nucleus to receive input from electroreceptors on the skin. The ELL is subdivided into three maps: the centromedial segment (CMS), centrolateral segment (CLS), and lateral segment (LS) which receive input from tuberous electroreceptors processing high frequency signals. Two feedback pathways from higher order nuclei, the nuc...

Al-Reasi, Hassan Ali

Attempts to use stable isotope carbon (delta13C) and nitrogen (delta15N) ratios to construct trophic positions and track mercury biomagnification in zooplankton and 13 fish species from a coastal food web of the Gulf of Oman illustrated some potential differences in this environment compared to the aquatic ecosystem of the northern hemisphere. Due to the large difference in delta13C values (3.4‰) between zooplankton planktivorous fish species (S. crumenophthalmus, S. longiceps and R. kana...

Mahadevan, Vaidyanatha Iver

The thesis deals with the use of a dilatometer in studying some of the physico-chemical phenomena occurring in fresh fish flesh when subjected to freezing at temperatures ranging from 0° C to -30° C. Two different kinds of fish flesh, marine lingcod (Ophiodon elongatus) and fresh water rainbow trout (Salmo gairdnerii) were used for comparison. True freezing point determinations of samples of fresh flesh cut from the above species of fish were made and found to be the same, viz, -1.5°C (29.1°F.)...

Botta, Joseph Richard

The effect of brine- and plate-freezing and length of subsequent frozen storage upon flesh pH, thaw drip, color, flavor, TBA (2-thiobarbituric acid) values, and long chain free fatty acids of Pacific halibut, Chinook and Coho salmon was determined. The effect of freezing method upon sodium, potassium, and chloride concentration was also determined. Flesh pH of all three species generally declined significantly (P ≤ 0.05) with length of storage. The thaw drip of Pacific halibut and Chinook salm...

Tohmé, Marie

Depuis le début des années 1990, de nombreuses équipes de recherche ont consacré leurs travaux à étudier les effets des perturbateurs endocriniens (PEs) sur l'homme et les espèces animales. Plusieurs polluants libérés dans l’environnement tels que les pesticides, les herbicides, les plastifiants industriels ou les résidus de médicaments ont ainsi le potentiel de perturber les équilibres hormonaux des organismes, induisant ainsi de graves conséquences sur leur développement et leur reproduction. ...

Mufudza, Pardon

Thesis (M. Dev.) -- University of Limpopo, 2016 / Most rural communities in developing countries are involved in various natural resource exploitation programmes to improve their livelihood status. The main objectives of the research were to assess the contribution of fish conservation as a strategy towards improving the livelihood status of people in Maranda Ward 9 in Mwenezi, Zimbabwe, and to ascertain the challenges in fish conservation and access to fishing activities. In this research,...