Feulner, Philine

The ultimate aim of this study is to better understand the relevance of weak electricity in the adaptive radiation of the African mormyrid fish. The chosen model taxon, the genus Campylomormyrus, exhibits a wide diversity of electric organ discharge (EOD) waveform types. Their EOD is age, sex, and species specific and is an important character for discriminating among species that are otherwise cryptic. After having established a complementary set of molecular markers, I examined the radiation o...

Klaer, Neil L, n/a

Haul-by-haul steam trawler catch and effort data for 1918�23, 1937�43 and 1952�57, which covers a large portion of the history of steam trawling in the Australian South East Fishery, were examined in detail for the first time. There were 64,371 haul records in total. The catch-rate for all retained catch combined shows a strong decline overall, with a brief recovery during World War II, probably due to increased retention of previously discarded species. The fishing fleet moved to more distant f...

Peterson, Kylie, n/a

Six rivers within the upper Mumbidgee catchment were sampled for larval and juvenile fish. The rivers represented both regulated and unregulated flow regimes and varied widely in size. There was wide variation in the larval fish communities supported by each river, both in terms of the species diversity and total abundance of fish sampled. The highly regulated reach of the Mumbidgee River sampled during this study had the highest numbers of native species and native individuals of any river samp...

Chotipuntu, Piyapong, n/a

The Murray cod (Maccullochella peelii peelii Mitchell 1838) is Australia�s largest freshwater fish. Once highly abundant in the Murray-Darling river system, populations have drastically declined in recent decades. Many causes for this decline have been proposed, including over-fishing, habitat loss and altered river flow regimes. This study hypothesised that elevated salinities have led to selective mortality in some developmental stages, which have in turn depleted stock recruitment and adult p...

Brooks, Emma, n/a

This thesis sets out to examine issues of selectivity and availability in fishing and shellfish gathering by pre-European Maori at Triangle Flat in western Golden Bay. Faunal remains from four archaeological sites have revealed new and valuable information about economic subsistence practices in this region. It is proposed that exploitation of these important coastal resources was based on factors other than the availability of, proximity to resource patches. Evidence from the Triangle Flat sit...

Hansen, Eric Allen, n/a

Individuals within a species often compete for resources in both space and time. In dominance hierarchies individuals with the greatest competitive ability will occupy prime locations during optimal periods to increase efficiency in gathering a resource. Subdominant individuals with low competitive abilities may be forced to reside in habitats of poor quality relative to dominant individuals. In this study I examined the long term patterns of giant kokopu distribution, movement, growth, habitat ...

Medeiros, Elvio S. F, n/a

Drylands occupy about one-third of the world's land surface area and rivers in these regions have less predictable flow regimes than those in humid tropical and temperate regions. Australia's dryland river-floodplain systems cycle through recurrent periods of floods and droughts, oflen resulting in extreme hydrological variability. As a result, these systems have been described as having a 'boom and boost' ecology with periods of high productivity associated with flooding. Not surprisingly, flow...

McGlashan, Dugald James, piscador@hotmail.com

Freshwater systems offer important opportunities to investigate the consequences of intrinsic biological and extrinsic environmental factors on the distribution of genetic variation, and hence population genetic structure. Drainages serve to isolate populations and so preserve historical imprints of population processes. Nevertheless, dispersal between and within drainages is important if the biology of the species confers a good dispersal capability. Knowledge of the population genetic structur...

Seaton, Marjorie, University of Western Sydney, College of Arts, School of Psychology

High-ability students will provide future leadership in many fields of endeavour. However, the current practice of educating high-ability students in academically selective classes and schools may not provide the optimum environments for all such students. Big-fish-little-pond effect (BFLPE) research has demonstrated that students in high-ability environments have lower academic self-concepts than equally able students in low-ability settings. Low academic self-concepts are associated with negat...

West, David William

To assess anthropogenic impacts of point-source and diffuse discharges on fish populations of the Waikato River, compare responses to different discharges and identify potential sentinel fish species, we sampled wild populations of brown bullhead catfish (Ameiurus nebulosus, (LeSueur, 1819)), shortfin eel (Anguilla australis Richardson, 1848), and common bully (Gobiomorphus cotidianus McDowall, 1975) in the Waikato River. Sites upstream and downstream of: geothermal; bleached kraft mill effluent...

Tracey, Danielle K., University of Western Sydney, College of Arts, Education and Social Sciences, School of Education and Early Childhood Studies

A major concern facing special educators is how best to educate students with mild intellectual disability, and whether regular or special classes are appropriate. The big fish little pond effect (BFLPE) predicts that students with mild intellectual disability will have higher academic self-concepts when in a special class, whereas labeling theory predicts that placing these students in special classes will lower their self-concepts. This study addresses some of these issues by: identifying a ps...

Chatfield, Brenton Sean

Knowing where species are and understanding why is paramount for developing relevant and sustainable conservation and resource management strategies. The need for this information is becoming urgent as fishing activity, resource extraction and the impacts of coastal developments continue to put marine resources under increasing pressure. As logistical and financial constraints can restrict our ability to collect data in the marine environment, the ability to predict distributions based on known ...

Webb, Diane

Most environmental studies concerning the environmental health of the Swan- Canning River system have focussed on nutrient inputs from both rural and urban catchments that are the cause of algal blooms. On occasions these algal blooms have resulted in fish deaths attributed to oxygen starvation. Relatively few studies have examined whether non-nutrient contamination is affecting the health of the riverine environment. Those studies that have, have concentrated on measuring the levels of heavy me...

Bazzi, Mohamad

Actinopterygian remains have been recovered from Upper Cretaceous (uppermost lower to lowermost upper Campanian) marine strata of the Kristianstad Basin, southern Sweden. This is the first record of Upper Cretaceous bony fish from the Fennoscandian shield. The fauna consists of higher taxa including Pachycormiformes (Pachycormidae), Elopiformes (Pachyrhizodontidae), Pycnodontiformes (Pycnodontidae), Aulopiformes (Enchodontidae), Ichthyodectiformes (Ichthyodectidae), and indeterminable teleost fi...

Hrenchuk, Lee

To improve our understanding of how environmental mercury (Hg) concentrations influence Hg in fish, I conducted a field experiment to quantify the relative contributions of dietary and aqueous exposure to Hg levels in fish. To further assess the importance of water as a source of Hg to fish, a long-term dataset from the Mercury Experiment to Assess Atmospheric Loading in Canada and the United States was used as input data for two Hg bioaccumulation models: OneFish (accumulation from food and wa...

Martin, Zoya

Broad Whitefish are an anadromous Arctic fish species in the Mackenzie River Valley, N.W.T. that undergo extensive spawning migrations to spawning grounds located on tributaries of the Mackenzie River, like the Arctic Red River. These spawning migrations occur annually between mid-October and early November as demonstrated with catch-per-unit-effort. The maturity stage development of Broad Whitefish is can be predicted by using the variables by gonad-weight and timing of migration for both fem...

Partridge, Amy D.

Site-specific acute- and chronic-exposure toxicity tests were conducted on five fish species (i.e., channel catfish, fathead minnow, northern pike, walleye and white sucker) resident to the Red and Assiniboine Rivers to evaluate survival and growth effects of un-ionized ammonia (NH3). Site-specificity was established using Red River water as the control and dilution water for all toxicity tests. 96-hour LC50 values ranged from 0.22 mg NH3/L for larval white sucker to >0.76 mg NH3/L for juvenile ...

McCulloch, Bruce R.

A biogeographical survey of southern Manitoba determined the present distribution of the stonecat (Noturus flavus), a recent invading species, and placed an approximate timing of its arrival. Habitat and dietary comparisons between stonecats, longnose dace (Rhinichthys cataractae) and burbot (Lota lota) were made to evaluate interactions between these species. In the Assiniboine, Little Saskatchewan and Souris Rivers, presence of stonecats close to the base of dams indicates that the species has...

Stepaniuk, Jeffray R.

Total cadmium, copper and lead contents were determined for water sediment, macrophytes and fish at 28 lotic sites located within the area bounded by 56*19' and 56*42'N, and 93*56' and 94*43'W on the Nelson River system in northern Manitoba. Samples were obtained during 10 collection periods during the May to September 1988. Atomic absorption spectrophotometry and the standard additions method were used. Results showed generally that metals were least concentrated in water, and most concentrated...

Othman, Rgia A.

The discovery of new immunosuppressive drugs has resulted in an improvement of short-term graft survival. Despite this achievement, long-term cardiac allograft survival has not been correspondingly improved. Cyclosporine A (CsA), an effective immunosuppressive drug, has been shown to increase the risk of hyperlipidemia, hypertension, kidney injuries and chronic rejection despite its extensive use in the clinical setting. Therefore, these side-effects of CsA, may further contribute to graft fai...

Gruenfelder, Catherine A.

<p> A diet rich in omega-3 fats has been shown to reduce the risk of cardiovascular disease. Long chain omega-3 fats found in fatty fish are especially important to cardiovascular health. Consumption of these fats is low, in part because there are few natural sources. This has led to the development of omega-3 fortified foods. Currently available fortified foods demonstrate conflicting nutritional information. Addition of omega-3 fats to an otherwise unhealthy food is perceived by consumers as a...

Duhaime, Johannie

As land use transformations are the main driver of biological diversity loss at the global scale, it is essential to provide predictions and understanding of their impacts in order to improve the mitigation of ecosystem perturbations. The first objective of this project was to describe the response of biological assemblages along a gradient of urbanization and to compare metrics of watershed imperviousness in order to determine, as has been suggested in the literature, whether effective impervio...

Chateauvert, Julie L.

Pollution is a major cause of biodiversity declines worldwide. Therefore, understanding exposure and uptake mechanisms for contaminants such as mercury (Hg) is a crucial step in our efforts to understand the causes of species decline. I investigated the influence of dietary reliance on the benthic food chain, and the influence of the proportion of zebra mussels in the diet, on the accumulation of Hg in freshwater fish and turtle species. I collected turtle blood samples and fish muscle samples i...

Coulson, Mark

The spatial scale at which populations are genetically structured is of immense interest for the understanding of a species’ ecology and evolutionary biology. This can have important implications for management of resources as well as predicting responses to future change. Rainbow smelt (Osmerus mordax) is an anadromous species with a relatively short freshwater residence time compared to other species with similar life-history strategies. Therefore, while they offer the opportunity to sample di...

Kazantzidou, Maria-Thérèse

The small scale fishery is almost disappearing on the Swedish east coast, meanwhile the demand for fresh fish increases. The project investigates the feasibility for a local fish market in Stockholm and the creation of a local food economy, mediating the challenges of the fishing industry. Located at the seashore of Djurgården, the building act as an information center, market hall and fish auction. Stockholm is Sweden's biggest city and surrounded by fishery. Yet it is almost impossible to get ...

Simonsen, Kirsten A

Understanding the role that habitat plays in the life history of reef-associated fishes is particularly significant given the dramatic increase in the number of artificial reefs deployed in coastal ecosystems over the past 50 years. In the Gulf of Mexico, the oil and gas industry has added a significant amount of structure to the Louisiana continental shelf, creating the largest de facto artificial reef deployment area in the world. Noting their usefulness as fish habitat, the Louisiana Artifici...

Martin, Jonathan

Heavy fuel oils (HFO) are produced from the refining of crude oils, and have high specific gravities and high viscosities. In recent years, spills of HFO have increased in the environment, and are of great concern because they are difficult to clean up. Spilled HFO is likely to become submerged, and can become stranded if fresh HFO coats benthic substrates or if weathered HFO sinks as tarballs. Conversely, lighter oils float on the surface and their components disperse and become diluted in the ...

DEDDEN, ILSE

Sexual selection and the maintenance of species diversity in Lake Malawi cichlid fishes are greatly dependent on optical communication, which is influenced by environmental, physiological and endocrinological factors. The diversity in spectral sensitivity of cichlids has been partially attributed to differences in opsin gene expression, with each species preferentially expressing a subset of seven possible genes. Hormones such as gonadotropin releasing hormone (GnRH) can mediate changes in gene ...

DeMille, Matthew James

This study provides a biological perspective on the potential of using year-round sanctuaries to protect largemouth bass (Micropterus salmoides). Although the Rideau Lakes bass sanctuaries have been present for more than 70 years, a lack of empirical rationale has resulted in a considerable debate regarding their usefulness. Using radio telemetry in Lake Opinicon, Ontario, the current study indicates that largemouth bass behaviour is influenced by the structural complexity of the habitats they o...

Dowker, ANDREW

Monocarboxylate transporters (MCTs) are bi-directional symporters that couple proton movement to a variety of glycolytic metabolites, including lactate and pyruvate. As such, MCTs not only play a crucial role in pH regulation, but could also function in the distribution of substrates between organelles, cells and tissues. This function may be critically important during hypoxia, when tissues depend on glycolytic flux for energy. We have examined the role of MCTs during hypoxia in an estuarine t...

Khan, Colin Winston

The risk of crude oil exposure to the early life stages (ELS) of fish is difficult to assess, given the complexity of the chemical composition of different oils. The aromatic portion of crude oil contains polycyclic aromatic hydrocarbons (PAH), which are known to be toxic. In 2004, an “effects-driven” fractionation research program was initiated in an attempt to better identify toxic constituents of two unique crude oils, Alaskan North Slope Crude (ANSC; medium-heavy crude) and Scotia Light (SCO...

Davies, Rhiannon

The influence of body size on metabolic rate, muscle enzyme activities, and the underlying patterns of mRNA for these enzymes were explored in an effort to explain the genetic basis of allometric variation in metabolic enzymes. Two pairs of sister species of centrarchid fishes were studied: black bass (largemouth bass, Micropterus salmoides and smallmouth bass, Micropterus dolomieui), and sunfish (pumpkinseed, Lepomis gibbosus and bluegill, Lepomis macrochirus). The goal was to assess the regula...

Pizano, Rebecca I

In 2011, Texas experienced the worst drought in recorded history. This has escalated concerns regarding environmental flows needed to sustain freshwater and estuarine systems as human needs are addressed during drought periods. In this thesis, I analyze fish assemblages and water quality variables in order to observe the effects of drought in the lower Neches River below the saltwater barrier located upstream from Beaumont, Texas. Fish and water quality samples were taken during drought conditio...

Wilson, Rose

Graduation date: 1995

秋山, 吉寛, Akiyama, Yoshihiro B.

No description available.

van Poorten, Brett Theodore

This thesis explores how competition and predation by coexisting fish species affect recruitment (number of hatched larvae recruiting into the population). The study is primarily based on field manipulations on a series of eight lakes found in two parallel watersheds, each with two species of fish: rainbow trout (Oncorhynchus mykiss, referred to as trout) and northern pikeminnow (Ptychocheilus oregonensis, referred to as pikeminnow). Different lakes had adults of one species or the other deplete...

Charles, Christopher

Maternal and child undernutrition are a significant problem in the developing world, with serious consequences for human health and socio-economic development. In Cambodia, 55% of children, 43% of women of reproductive age, and 50% of pregnant women are anemic. Current prevention and control practices rely on supplementation with iron pills or large-scale food fortification, neither of which are affordable or feasible in rural Cambodia. In the study areas, 97% of women did not meet their daily i...

Edwards, G. Morgan

A functional understanding of how phenotypic traits may affect growth, reproduction and survival is necessary to understand their ecological and evolutionary consequences. Larval dragonflies (Odonata: Anisoptera) swim using jet propulsion, likely controlled by abdominal traits and perhaps to escape fish predators. I investigated whether abdominal morphology explains swimming performance and if either explains the distribution of larvae among ponds that vary in predation risk. I recorded and meas...

Li, Kwan Yu

The objective of this study was to use a Community Based Participatory Approach and the results of a needs assessment conducted in previous research to develop videos on the topic of consuming fish during pregnancy. Phase one entailed conducting two small discussion groups with Chinese-Canadian women (n=28) to verify that the data collected in the needs assessment was still valid and to obtain more specific information about the preferred style of the videos. In phase two, researchers developed...

Fox, Erika Jade

<p> To evaluate the success of reestablishing tidal connection to salt marshes as a method of creating new fish habitat, both newly-restored and previously-restored (hereafter termed "reference") habitats within the Huntington Beach Wetlands Complex were monitored over a two year period. Although fish abundance and diversity metrics were generally equivalent between marshes within one year, community composition remained different. Newly-restored habitat generally had higher abundances of plankt...

Holmes, Teslin G.

No description available.

Spencer, Stephen

No description available.

Adijaya, Mardan

No description available.

Manriquez-Hernandez, Juan A.

In land-based integrated aquaculture of marine finfish and macroalgae, rearing space is a large expense. Increasing algal stocking density can increase efficiency, but this may require greater irradiance because of self-shading. To determine the irradiance needed, experiments were conducted in one-litre flasks with enriched seawater under natural and artificial illumination. Under natural illumination, a Daily Photon Dose of 17 mol m-2 d-1 at 10 and 14 ºC, Palmaria palmata cultured at 10 g L...

Nguyen, Van Trai

Research Doctorate - Doctor of Philosophy (PhD) / Shrimp farming and capture fishery are two of the major industries of Can Gio district, Ho Chi Minh City, southern Vietnam. These industries have recently developed and contributed to the improvement of local economy. However, they have also raised environmental concerns regarding water pollution and fish stock depletion. The negative impacts of shrimp farm effluents on the water quality of mainstream rivers and fish communities have not been stu...

Beesley, Leah

[Truncated abstract] This study investigated the organisational role of environmental stability on the fish communities that inhabit the Fortescue River, an intermittent and variable system in north-Western Australia. It did so by examining the relationships between pool stability (measured by persistence of water through time, and variation in maximum pool depth through time) and the number and type of species within pools, temporal fluctuations in total fish abundance and intra-specific abunda...

Hill, Evelyn June

This study is an attempt to simulate aspects of human visual perception by automating the detection of specific types of objects in digital images. The success of the methods attempted here was measured by how well results of experiments corresponded to what a typical human’s assessment of the data might be. The subject of the study was images of live fish taken underwater by digital video or digital still cameras. It is desirable to be able to automate the processing of such data for efficient ...

Glassner, David

Global demand of fish for consumption in developing nations is expected to continue to rise in the near future, putting pressure on stocks that are already overexploited. In the territorial waters of Panama there is a constant struggle between commercial vessels with high yield, subsistence fishermen trying to feed a remote village, and ecosystem services struggling to sustain themselves. These services are the direct and indirect benefits received by the population in the form of food, raw mate...

Odom, Jennifer Fletcher

The Indian River Lagoon, Florida, is a unique closed “bar built” estuary system that has little interchange with the Atlantic Ocean and which is home to many resident species. Three fish species were investigated to see if their isotopic and fatty acid signatures differed based on geographic location. The goal was to assess the degree of resolution of spatial variation that is possible when using stable isotope and fatty acid signature analysis to interpret feeding habits and potential linkages ...

Pheiffer, Wihan

Levels of selected metals and persistent organic pollutants (POPs) were investigated in sediment and fillet tissue of the sharptooth catfish (Clarias gariepinus), from sites along the Orange-Vaal River system, South Africa. A histological assessment was done on the livers, kidneys, and gills of the fish sampled to determine morphological changes. The sediment and fish sampling sites were selected up- and downstream of major pollution sources such as mining, industrial and agriculture. The concen...