Juby, Roxanne

Distinct day-night changes in ambient light are recognised as an important driver of animal activity patterns, with predictable changes to the structure and composition of animal communities between day and night. While day-night variation in the structure of animal communities has been well researched for terrestrial organisms and shallow marine fish communities around the world, there has been limited research of this type conducted on South Africa’s rocky reef fish communities. Consequently, ...

Muller, Cuen

The value of mangrove habitats as fish nurseries was assessed by comparing communities of early stage and juvenile fishes between estuaries with and without mangroves. Early stage fishes were sampled using boat-based plankton towing while juveniles were sampled by seine netting. Sampling took place at five sites spaced 1 km apart starting near the estuary mouth in four estuaries along the temperate coastline of the Eastern Cape Province of South Africa. Four estuaries were selected based on shar...

Van der Merwe, Schalk

Includes bibliographical references. / There are neither historical nor current baseline information relating to the productivity of the OFCA veld and a definite link between the current crisis and the possibly that it is suffering from the effects of having farmed the OFCA veld into a state of durable suboptimal productivity remains to be conclusively established. This current study has been undertaken in order to investigate such a possible link, and to reach a more definite conclusion with re...

Wilson, Sara N.

Patterns of genetic connectivity can help answer key questions about the evolutionary ecology of fishes. This knowledge is particularly useful when considering the management and conservation of species that are impacted by fisheries. Population connectivity in ocean habitats is heavily influenced by environmental and oceanographic factors. These factors can lead to strong genetic differences within populations, causing fragmentation into smaller subpopulations. The Red Sea exhibits pronounced o...

Rondeau, Eric B.

As two species diverge, much of their genomes begin to differentiate. In many lineages, however, the genomic structure remains remarkably intact, with orthologous gene content maintained across millions of years and significant changes to their biological characteristics. The maintenance of gene content is defined as conserved synteny while the preservation of gene order is defined as conserved linkage; the conservation of both can be incredibly informative when interrogating and comparing two g...

Mbatyoti, Owen A

Very little is known about the spatio-temporal ecology of the yellow mongoose Cynictis penicillata, despite this small carnivore being widely distributed in the southern African subregion. Until the present study, activity patterns and daily movement distances had only been investigated over a single season, and information on home range sizes was only available from a few populations. Here, I aimed at determining the activity patterns and the space use of yellow mongooses over the different sea...

Lamani, Siviwe

The diet of the woodland dormouse Graphiurus murinus was studied in a riverine Combretum forest at the Great Fish River Reserve (Eastern Cape, South Africa). Food remains were collected seasonally from a maximum of 45 different nest boxes between December 2010 and November 2011. An overall mean of 1.32 ± 0.51 food categories (range 1–4) were identified in each nest box used as “larder” during the year. Dietary diversity and standardized diet breadth were low to intermediate, with a peak in summe...

Smith, James Durward

This work explores the metabolism of mercury in liver and spleen tissue of fish from a methylmercury contaminated wetland. Wild-caught bass, catfish, bowfin and gar were collected. Macrophage centers, which are both reactive and primary germinal centers in various fish tissues, were hypothesized to be the cause of demethylation of methylmercury in fish tissue. Macrophage centers are differentially expressed in fish tissue based on phylogenetic lineage, and are found primarily in the livers of pr...

Zhou, Hai Yun

No description available.

Reizenberg, Jody-Lee

Global climate change models indicate that a rise in temperature and reduction in rainfall in the Western Cape Province of South Africa is inevitable and unavoidable. Within the Western Cape lies the Cape Floristic Region (CFR); a biodiversity hotspot with high levels of endemism. This includes its freshwater fish assemblage. Whereas the current greatest threats to native fish biodiversity are habitat degradation and invasion by non-native species, predicted climate change is likely to further i...

Söderström, Maria

This thesis is focused on studies on the environmental fate and methodological improvements for determination of the global contaminants, PCBs and DDTs, and locally discharged phenolics, e.g. 4,5,6-trichloroguaiacol (4,5,6-TCG), and their transformation products. 4,5,6-TCG is released from bleached pulp mills, and was chosen as a model substance, to study its fate and effects in aquatic environments. In a brackish water model ecosystem, 4,5,6-TCG was shown to be transformed via demethylation, de...

Bin Asad, S M Sayeed

Hydropower is one of the main sources for Sweden’s energy, which is clean and renewable. It is a clean energy source because no fuels are burned which does not pollute the air and it is a renewable energy source as it only uses natural water cycle for generating energy. However, hydropower has some consequences in nature, such as creating dams in rivers and changing water flow directions, which lead to some problems for migrating fishes. These fish migration problems are mostly studied from a bi...

Hill, Jeanne E. (Jeanne Elizabeth)

Requiem for Netted Fish is an intermedia composition for sixteen-voice SATB choir, harp, six dancers, slide projections, and lighting. The text, taken from the poetry of Anna Akhmatova and Carolyn Forche, presents a universal, womanly rage against human repression and destruction. The poetry finds aural interpretation in sound, and visual interpretation in movement and lighting. Poetic inspiration contributes to the integration of elements in the work, as does the impulse-exchange method of coor...

Leduc, François

La fraîcheur est un paramètre déterminant de la qualité sanitaire du poisson. S’agissant d’une matrice très altérable, l’évaluation objective de sa fraîcheur est essentielle pour les opérateurs de la filière mais également pour les services d’inspection. Différents outils et techniques sensoriels, chimiques, physiques et microbiologiques ont été développés pour essayer de déterminer le niveau d’altération mais présentent plusieurs limites et caractérisent le plus souvent des seuils de rejet. L’o...

Hoeinghaus, Ana Paula Ferrari

Natural flow regimes are critical for sustaining biodiversity and river integrity. Floods and droughts form an important component of river systems and control population sizes and species diversity across space and time. Modification of flow regimes, including disruption of the timing, magnitude and duration of flooding, is a global problem, and many new impoundments are planned for large river-floodplain ecosystems in the tropics. Flow modifications may cause dramatic non-linear responses i...

Kupara, Tapiwa Ronald

Magister Philosophiae - MPhil / This study outlines human dimensions in the hake sector in South Africa in terms of hake fish workers. The hake fish workers condition of employment, security of employment, social security issues, remunerations and their living conditions forms part of the social, economic and political dimensions in hake fisheries. The need for ensuring sustainable long-term utilisation of the hake resource and to manage, prevent and reduce all adverse effects of harvesting the ...

Lopes, Keolohilani Harold, Jr.

<p> The predominant method to quantify reef fish populations is the Open Circuit SCUBA (OC) <i>in-situ</i> fish survey. However, there are many biases associated with these surveys including the expelled OC exhaust which can cause visual and audible disturbances. This study aims to evaluate the bias created by OC exhaust utilizing closed-circuit rebreather (CCR) surveys, along surveys were conducted in protected areas and fished areas. The three sites in the main Hawaiian Islands were Kealakekua...

Makinodan, Yasuo

Kyoto University (京都大学) / 0048 / 新制・論文博士 / 農学博士 / 乙第1816号 / 論農博第306号 / 新制||農||108(附属図書館) / 学位論文||S46||N420(農学部図書室) / 3067 / UT51-46-C1034 / (主査)教授 池田 静徳, 教授 木俣 正夫, 教授 秦 忠夫 / 学位規則第5条第2項該当

Ueda, Tadao

Kyoto University (京都大学) / 0048 / 新制・課程博士 / 農学博士 / 農博第72号 / 新制||農||61A(附属図書館) / 学位論文||S41||N201(農学部図書室) / 1532 / 京都大学大学院農学研究科水産学専攻 / (主査)教授 池田 静徳, 教授 木俣 正夫, 教授 秦 忠夫 / 学位規則第5条第1項該当

Shimizu, Ushio

Kyoto University (京都大学) / 0048 / 新制・課程博士 / 農学博士 / 農博第7号 / 新制||農||3(附属図書館) / 学位論文||S34||217(農学部図書室) / 72 / 京都大学大学院農学研究科水産学専攻 / (主査)教授 清水 亘, 教授 川上 太左英, 教授 満田 久輝 / 学位規則第5条第1項該当

Viñuela Rodríguez, Nuria

The genus Pelasgus (Cyprinidae) is endemic to the southern part of the Balkan Peninsula and includes seven species. In this work, a multilocus approach has been applied to study phylogenetic relationships between the species and their populations and to revise their distribution areas. 180 specimens from 47 localities from 30 river drainages were analyzed, comprehensively covering the distribution range of the genus. Moreover, samples from type localities of all species were included in the anal...

Sampson, Mark Robert

The Agulhas Bank supports a speciose fish community, many of which are commercially important. Despite substantial research being conducted on aspects of their biology spatial aspects of their distribution and abundance in relation to environment parameters has been ignored. This study, therefore, addressed aspects related to the distribution and abundance of representative species on the Agulhas Bank within a Geographic Information System (GIS). Four candidate species were chosen due to their i...

McFadyen, Shannon Ashley

Anthropogenic development is altering watersheds and threatening freshwater ecosystems and the resources therein. Direct impacts of industry including conversion of land cover and increased water withdrawals from rivers, compounded with indirect influences such as climate change, collectively affect the health and sustainability of freshwater ecosystems. Many studies have indicated a suite of ecological impacts that large-scale anthropogenic land use and development impose on the structure and f...

James, Nicola Caroline

Long-term interannual changes in richness, abundance, diversity and structure of the fish community in the temporarily open/closed East Kleinemonde Estuary, Eastern Cape, are described and the recruitment success of two estuary-dependent marine species assessed. In addition, laboratory experiments were conducted to assess the possible role of olfaction in the recruitment process of an estuary-dependent marine fish species. Multivariate analyses of the annual marine fish communites identified two...

Scott, Lucy Elizabeth Powell

A Geographic Information Systems (GIS) atlas of southern African freshwater fish was developed for the SADC countries from natural history collection specimens, hydrological, topographical and climatological data. The primary purpose of the development of the atlas of freshwater fish was the construction of a practical framework to transform vast amounts of existing biological data for use in research and management of aquatic resources. The database of freshwater fish collection specimens that ...

Brouwer, Stephen Leonard

Carpenter, Argyrozona argyrozona (Valenciennes, 1830), is an endemic South African sparid fish. They form an important component of the commercial linefishery on the South African east coast, where they are the third most important species landed. Recent investigations revealed that the catch per unit effort (cpue) of this species has declined markedly since the early 1900’s. Despite these declines and the importance of this resource, remarkably little biological information on this species exis...

Jambo, Collins Mayeso

The three major species Lethrinops ''pinkhead'', Otopharynx argyrosoma "red" and Copadichromis. cf virginalis which used to dominate the catches (by weight) of Lake Malombe in the past decade were investigated. In order to make rational recommendations regarding size and boundary of the existing sanctuary area (lightly fished), distribution and abundance, population structure and reproductive biology of the three species were related to habitat types of the southern part of the lake (south weste...

Kruger, David Philip

The aim of this work was to investigate the nutrition of a popular ornamental fish, the swordtail (Xiphophorus helleri), under intensive aquaculture conditions. The study focused on the formulation and manufacture of artificial dry diets, as well as the influence of livefeed supplementation on growth and nutritional indices of both juvenile and broodstock fish. A combination of 65% fishmeal and 35% soya oil cake meal was found to closely approximate the essential amino acid profile of X helleri ...

Olds, Alexis Amy

Freshwater fish species have been introduced into freshwater systems around the world, primarily for aquaculture, ornamental fish trade and sport fishing. Their introduction into estuarine systems is uncommon however, instances do occur and their establishment success and impacts on these estuarine systems is not well documented. The extent of invasion by four freshwater fishes in a RAMSAR listed estuarine system, the Wilderness Lakes, Western Cape was investigated. This thesis determined the re...

Fike, Bradley Robin

The re-introduction of black rhinoceros onto the Great Fish River Reserve in the Eastern Cape, following the species absence for over a century, created an opportunity to study this species in the thicket biome, and in particular the succulent thicket of the Great Fish River valley. The thicket biome is quite different from the habitats in which other extant populations of these animals are found and where studies of their demography have been undertaken. Data collection occurred from May 1986, ...

Pattrick, Paula

The larval fish assemblage in the shallow, nearshore region of a proposed marine protected area (MPA) in eastern Algoa Bay, temperate South Africa was investigated. Current velocities and direction and the swimming abilities of late-stage larvae were further assessed to determine potential larval movement to and from the MPA. In total, 6045 larval fishes were collected along two depth contours (~5m and ~15m) in the shallow nearshore of eastern Algoa Bay using stepped-oblique bongo net tows, twic...

Rossetti, Nani Adami

Lipids are essential components for fish because they contain fatty acids that are vital for regular growth and health. Fish oil is rich in eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), which are essential fatty acids for carnivorous fish, and therefore this product has traditionally been used as the main source of lipids in fish feeds. However, with declining fisheries resources worldwide and the rapid expansion of the aquaculture industry pressuring this finite resource, such ing...

Montoya-Maya, Phanor Hernando

Larval fish and zooplankton assemblages were studied in nine south and west coast estuaries in the cool-temperate and the cool/warm-temperate boundary region between June 2003 and March 2004. This study served to provide new information on previously unstudied estuaries and expand on existing knowledge of larval fish and zooplankton assemblages associated with various estuary types. The south and west coast estuaries sampled in this study showed lower salinities (12.2 - 13.7), lower water temper...

Nthimo, Mokitinyane Francis

The construction of the Katse dam was completed in 1996. The dam started filling in 1995 and reached full capacity in early 1998. It forms part of Phase 1A of the Lesotho Highlands Water Project (LHWP). The main aim of the project is to provide revenue to Lesotho, by transferring water from the catchment of the Senqu (Orange) River in Lesotho to South Africa’s major industrial and population centres. During the implementation of the project, an estimated 130 people were displaced. However, the m...

Reynders, Anthony Gerard

From introduction: This study is concerned with the factors responsible for mineralisation of water in the Great Fish River, in particular the irrigation return flow and groundwater seepage components. A small irrigated area in the lower Fish River Basin was chosen for a detailed study of irrigation water input, groundwater and seepage water fluctuati ons, and the affect of soils and rocks on river water mineralisation. / KMBT_363 / Adobe Acrobat 9.53 Paper Capture Plug-in

Maschmann, Gerald F.

This study evaluated the effects of a major chlorine disturbance on fish communities in Pecan creek by the City of Denton's Pecan Creek Water Reclamation Plant. Fish communities in Pecan Creek were sampled using a depletion methodology during February, April, July, and November, 1999. February and April sampling events showed that the fish communities were severely impacted by the chlorine. Sampling during July and November showed fish communities recovered in Pecan Creek. The first-twenty minut...

Blank, Tara M.

As selection pressures exist for not only adults, but for every life history stage, it is important to understand how environmental factors shape developing animals. Despite the significance placed on aquatic hypoxia as a driving force in the evolution of air breathing, this is the first known study to examine the effects of hypoxia on cardio-respiratory ontogeny of an air breathing fish. Blue gouramis are obligatory air breathing fish that possess a labyrinth-like structure that serves as the...

Porter, Danielle Tiffany

The integration of reproduction and metabolism is necessary for the survival and continuation of a species. While the neural circuits controlling energy homeostasis have been well-characterized, the signals controlling the relay of nutritional information to the reproductive axis are not conclusively defined. The cichlid fish Astatotilapia burtoni is ideal for studying the neural regulation of feeding and reproduction because during their parental care phase, females undergo a two-week period of...

FINDLEY, LLOYD TALBOTT.

This study presents the first partial systematic revision of the speciose American seven-spined gobiid fish genus Chriolepis, which occurs in sublittoral reef-rock and rubble cryptobenthic habitats in tropical-subtropical, primarily insular, waters of the eastern Pacific and western Atlantic oceans. Although a few of the (more poorly known) western Atlantic species are briefly discussed or mentioned, this study focuses on eight eastern Pacific species, representing the majority of the known form...

Barks, James Harold, 1966-

DNA amplification is an important mechanism of tumor progression that allows cancer cells to up-regulate expression of critical genes such as oncogenes. Recent studies using comparative genomic hybridization revealed increased DNA copies on chromosome 20q in seven melanoma cell lines and eight archival metastatic melanoma lesions. We performed FISH analysis of metaphase spreads in 13 melanoma cell lines and nine primary melanoma specimens using a variety of probes specific for chromosome 20. All...

Kosa, Maha Bahjat, 1962-

Toxic dinoflagellate Prorocentrum concavum cells (DC) implicated in ciguatera poisoning were lyophilized and mixed with a standard fish food and fed to Domino damsel fish (Dascyllus trimaculatus). Damsel fish fed 50/50-SC/DC and 100% DC diets exhibited physical and behavioral changes as well as death. Feed refusal was apparent among the fish fed 100% DC diet. Toxicity of the control group could be attributed to previous exposure of the fish to other polyether compounds in its natural habitat or ...

Ziegelman, Karen, 1960-

No description available.

Boltaña Harms, Sebastian

La respuesta inmune innata es basada en la activación de receptores genotípicamente codificados, llamados receptores de reconocimiento de patógenos (PRR). Los PRR pueden ser proteínas solubles tal como las proteínas plasmáticas PGRPs o pueden estar anclados en las membranas celulares como los TLR. Estos receptores son capaces de reconocer a los patógenos o a sus patrones moleculares (PAMPs). La interacción PAMP-PRR provoca la activación de genes diana y promueve la producción de mediadores pro- ...

Ting-Wei Wang, 王庭偉

碩士 / 國立中山大學 / 資訊工程學系研究所 / 99 / This thesis presents a 3D stereoscopic interactive fish tank system that combines the 3D stereoscopy and “controller-free” components. Based on the characteristics of human vision, when seeing the objects, the left eye image and right eye image will be slightly different, one can use the intensity information and the epipolar geometry to proceed matching, and then to generate the 3D depth information. This system allows a user to use gesture to do interaction. It e...

Tabaro, Simon Rukera.

Population escalation in the developing world has been associated with increased poverty, food insecurity and environmental degradation. The situation in Rwanda, with 2.82% annual population increase is no exception. The objective of the present study was to investigate an innovative integrated system of sustainable production suitable for resource-poor rural farmers, the Integrated Rabbit–Fish–Rice (IRFR) system. The study was targeted towards contributing to Rwanda government’s goals of eradic...

Pearson, Kimberly J., University of Lethbridge. Faculty of Arts and Science

Species that are introduced outside of their native ranges are an important threat to biodiversity. In southwestern Alberta, Canada, sport and bait fish have been introduced into most waterbodies. I examined the effects of introduced trout and minnows on the distribution, demography and behaviour of larval long-toed salamanders through a combination of field surveys, laboratory experiments and an outdoor mesocosm experiment. Results from field surveys at 30 high-elevation (>1500m) lakes confirme...

Schneider, Laurence H.

No description available.

Wilson, Carlyle J.

No description available.

Kuchapski, Kathryn A

Physical and chemical influences downstream of surface coal mines, including selenium (Se) release, water quality shifts, and habitat alterations can affect aquatic organisms. To evaluate these influences at the community level of organization, fish and macroinvertebrates were studied in mine-affected and reference streams. Se can be toxic to aquatic organisms and was measured in lotic food chains (water, biofilm, macroinvertebrates and juvenile salmonids). Invertebrate Se was significantly rela...

Sclafani, Matthew.

The buoyancy (or density = mass volume-1) of marine larval fish is influenced by their nutritional status, starved larvae being less dense than fed larvae of like age. Buoyancy has, therefore, been proposed as an indicator by which to assess the nutritional condition of marine fish larvae in experiments and in situ. It has also been hypothesized that larval fish experiencing advanced starvation will exhibit increased density due to water loss resulting from osmoregulatory breach and failure. The...