Oluwole, Adebanji Olasupo

Thesis (MScFoodSc)--Stellenbosch University, 2014. / ENGLISH ABSTRACT: Fresh ready-to-cook fish fillets are prone to rapid loss of freshness and other quality attributes, as well as accelerated growth of spoilage micro-organisms under sub-optimal storage conditions. Cape hake (Merluccius capensis) is an important seafood in South Africa; however, rapid loss of quality and eventual spoilage is a problem limiting the economic potential. Thus, the aim of this study was to investigate the effects of...

De Villiers, Christopher Murray

Thesis (MSc)--Stellenbosch University, 2012. / ENGLISH ABSTRACT: A 240-day growth study was conducted to determine the suitability of soybean meal (SBM) as an alternative protein source to fish meal (FM) in the diet of commercially produced South African abalone (Haliotis midae). The suitability of SBM was determined by a close evaluation of the following key factors: feed water stability, morphological impact on the abalone intestine and the effect on the growth performance of abalone. Th...

O'Toole, Michael John Peter

Includes bibliographies at end of chapters. / The following objectives are covered in the study: (i) the description of the seasonal hydrological changes in the survey area and a comparison between years. (ii) an examination of the seasonal distribution and abundance of the larval stages in relation to hydrological conditions. (iii) the determination of the preferential temperature and salinity ranges for the larvae. (iv) an examination of seasonal shift in location and intensity of spawning fro...

Chen-Wan Shu, 陳琬琡

碩士 / 大同大學 / 生物工程學系(所) / 94 / The purpose of this research is observing the appearance of the Macropodus opercularis and breeds behavior, and inquires in to affect to cover Macropodus opercularis young fish growth of agent. Study breeding of the effect manifestation Macropodus opercularis a period invite in every year three months to November, the mature male fish will first vomit bleb nest to be used as a fertilizied egg to hatch from eggs while floating the leaf plant and just born young fish ...

Reuter, Catherine Nell

Louisianas small streams provide critical habitat for diverse ecologically and economically important fish species. However, the relationship between these fish assemblages and habitat variables remains poorly understood. The role of anthropogenic alteration of dendritic stream connectivity is of specific interest and has been shown to significantly influence stream ecology. This study explored the interaction among watershed characteristics, stream connectivity, stream physico-chemistry, and fi...

Andersson, Elisabet

<p>Diss. (sammanfattning) Umeå : Umeå universitet, 1995, härtill 5 uppsatser.</p> / digitalisering@umu

Cawthorn, Donna-Maree

Thesis (PhD (Food Sc)--Stellenbosch University, 2011. / ENGLISH ABSTRACT: Consumers have the right to accurate information on the fish products they purchase to enable them to make educated seafood selections that will not endanger their own wellbeing or the wellbeing of the environment. Unfortunately, marine resource scarcity, financial incentives and inadequate or poorly enforced regulations have all promoted the mislabelling of fish species on global markets, the results of which may hold eco...

Morris, Thomas Colin

The Cape Elephant fish (Callorhinchus capensis) and two common sand shark species (Rhinobatos annulatus and Rhinobatos blochii) were caught off False Bay and Saldanha Bay and surveyed for their parasite community in 2013 and 2014. The surveys were used to build species accumulation curves (SAC) and calculate biodiversity indices, particularly, rarefied species richness, Shannon Weiner's diversity index, Simpson's index and Pielou's J index. The biodiversity indices were correlated with the host'...

Gammage, Louise Carin

Today, many pressures (socio-economic, resource scarcity, policy, and regulation) make fishers and their communities vulnerable on a variety of fronts. These pressures threaten fishing communities along the South African coast. Both natural and social changes in the traditional handline fishery affect the social-ecological system of a region as a whole. Fishers need to cope with these local global changes and require systems that support their strategies to achieve resilience. Furthermore, stres...

Villacastin-Herrero, Carlos A

Bibliography: leaves 182-198. / Three different techniques are used to established statistical relationships between annual pelagic fish species catches viz. pilchard, horse mackerel and chub mackerel, and monthly environmental indices. The three techniques are Spearman's Rank correlation, multiple regression and cross-correlations of the Box-Jenkins time series approach. The first method yielded interesting results but only in terms of the nature of the relationship not in terms of the response...

Ghebrehiwet, Dawit Yemane

Includes bibliographical references (p. 207-227) / Currently heavy ?shing is recognized as one of the major threats to the structural and functional organization of marine ecosystems in many coastal nations. The threat is mainly the result of the inherent nature of the various ?shing activities: size selectivity, habitat destruction, biomass removal, and uncertainty in resource status and management of the resource. Thus this thesis investigates structural changes that result from ?shing. This t...

Guambe, J F

Includes abstract. / Includes bibliographical references. / This thesis deals with the applicability of Ion Beam Analysis (IBA) techniques for ascertaining the extent of water pollution by analyzing scales of fish that live in polluted waters. As a fish grows, ions from its immediate environment are incorporated into the matrix of the fish scale and so scales can be used as biomarkers of pollution events.

Kemp, Lucy Valeska

Includes bibliographical references (leaves 48-54). / Ancient intertidal stonewall fish traps are found world-wide and those along the SouthAfrican south coast are the focus of my thesis. These fish traps, known locally as 'vywers', have recently enjoyed much media attention as interest increases in both South Africa's cultural heritage and its diminishing fish stocks. Two pioneering studies, by Goodwin (1946) and Avery (1975), provided the only documented knowledge of these vywers. My study ai...

Siyanga-Tembo, Fridah

Food production has been a constant feature of food security policies. This narrative has continued despite findings showing that food insecurity is structural, and more driven by issues of access than availability, particularly for low-income households in cities who live in a cash economy. While usually considered a rural issue, the urban poor with low and unreliable incomes also face food insecurity which manifests differently to that of their rural counterparts. Thus, this creates the need t...

KROUPOVÁ, Hana

No description available.

Cilleros, Kévin

Les écosystèmes tropicaux, en particulier les écosystèmes amazoniens, sont connus pour abriter une importante diversité d'organismes, terrestres ou aquatiques. Cependant, les causes et les processus responsables de cette grande diversité dans les assemblages de poissons d'eau douce restent encore peu connus, et leur identification est un fort enjeu dans l'évaluation future des impacts des perturbations humaines qui sont grandissantes dans ces milieux. Nous avons étudié les processus qui façonnen...

Gerber, Kayla M.

Master of Science / Division of Biology / Martha E. Mather / A flexible distribution is an adaptive response that allows animals to take advantage of spatial variation in the fluctuation of resources. Distribution of mobile organisms is complex so multi-metric patterns derived from dynamic distribution trajectories must be deconstructed into simpler components for both individuals and populations. Tagging and tracking fish is a very useful approach for addressing these fisheries research questio...

Nagl, Paula

Nas florestas sazonalmente inundadas de terras baixas da Amazônia, os peixes frugívoros desempenham diferentes serviços ecossistêmicos: possuem um papel importante na dispersão de sementes (regulação), além de serem um recurso (provisão) para pescadores artesanais. O uso extensivo de recursos limitados pode gerar conflitos de interesse entre os objetivos conservacionistas e as necessidades dos habitantes locais. O co-manejo tenta integrar a segurança alimentar e a conservação dos ecossistemas na...

van der Walt, Kerry-Ann

The Groot Marico catchment in the North West Province is a National Freshwater Ecosystem Priority Area (NFEPA) because it represents unique landscape features with unique biodiversity that are considered to be of special ecological significance. Three native freshwater species Amphilius uranoscopus, Chiloglanis pretoriae and Barbus motebensis, have high local conservation importance and B. motebensis is endemic to the catchment and is IUCN-listed as vulnerable. The main objective of this study i...

Bohner, Rodney

Oregon’s fish hatchery system developed in the late 1800’s in response to salmon fishery losses. Salmon hatcheries consist of a number of built components. ‘Growing fish’ requires a variety of building types which support the hatchery process as well as constant input of resources. In addition to surveying and inventorying fish hatchery resources, this study will analyze the social, economic, cultural, and environmental conditions under which these fish hatcheries were organized and commissioned...

Peryam, Thomas, Peryam, Thomas

In order to better understand the interactions between climate change, landscape erosion and sedimentation, a detailed study was conducted on Plio-Pleistocene non-marine deposits of the Palm Spring Group in the Fish Creek-Vallecito basin, California, USA. Three inter-related studies focused on (1) local response to global climate change in late Pliocene-early Pleistocene time, (2) large-scale evolution of lithofacies architecture, and (3) climate modulation of late Pliocene sediment flux on Mil...

Schneider, Mark Joseph, 1942-

Thesis (Ph.D.)--Oregon, Dept. of Biology Vita Bibliography: l. 85-90

Epo, Emilienne Ewee Ndofor

Magister Philosophiae - MPhil (LAS) (Land and Agrarian Studies) / Fish remains a vital source of food, income, nutrition and livelihoods for millions of people in Africa. This study investigated the modalities of trading in fish imported from sub-Saharan Africa into South Africa in the Cape Town Metropolitan area. The research analyses the opportunities and constraints faced by retail fish traders and importers regarding the South African and Southern African Development Community (SADC) policie...

Makushu, Elelwani Tabitha

Thesis (M.Sc. (Zoology)) -- University of Limpopo, 2018 / This study aimed to determine the effects of water and sediment quality on fish and the effects of land-use on the water and sediment quality of the Steelpoort River system. To achieve these aims, a few objectives had to be met. The water and sediment quality, the level of metal bioaccumulation of two fish species, the level of acetylcholine esterase inhibition in fish brain tissue, as well as changes in land-use over time. The study adds...

Phosa, M. J.

Journal article published in the International Conference on Public Administration and Development Alternatives 04 - 06 July 2018, Stellenbosch University, Saldahna Bay, South Africa / The purpose of this study was to investigate the contribution of small-scale fish farming subsector to rural income generation in Thulamela Municipality in Limpopo Province, South Africa. The study applied a qualitative method to collect data from individual respondents using the semi-structured interview involv...

Schmidt, Nicholas C

Establishing the associations between fish and their habitats can aid in the monitoring of fish stocks and the design of effective marine protected areas (MPAs). Baited remote underwater stereo-video systems (stereo-BRUVs) are now commonly used to asses fish populations. The habitats seen in the video footage of stereo-BRUVs can be used to link fish fauna to preferred habitat types. However, the application of bait potentially attracts fish from surrounding habitats, and might result in a biased...

Wasserman, Ryan J, Vink, Tim J F, Dalu, Tatenda, Froneman, Pierre William

Publisher version / Diatoms are important primary producers in shallow water environments. Few studies have assessed the importance of biological interactions in structuring these communities. In the present study, benthic diatom community structure in relation to manipulated food webs was assessed using in situ mesocosms, whereby predator-free environments and environments comprising two different fish species were assessed. Zooplankton abundance, settled algal biomass and the diatom community ...

Trassierra, Jaqueline Anne

The species composition, distribution and patterns of vertical migration of larval fish assemblages were investigated in March and in September 2013 within two adjacent log spiral bays, Algoa Bay and St Francis Bay, on the south coast of South Africa. Fish larvae were collected by means of a boat towed bongo net (57 cm diameter; mesh aperture 500 μm). An onshore (2 km) and an offshore (3 km) station were each sampled twice during the daytime (06:00 – 18:00) with two horizontal tows: near the sur...

Bernard, Anthony Thomas Firth, Gotz, A, Parker, D, Heyns, E R, Halse, S J, Riddin, N A, Smith, M K S, Paterson, Angus William, Winker, A H, Fullwood, L, Langlois, T J, Harvey, E S

[From introduction] Subtidal research presents numerous challenges that restrict the ability to answer fundamental ecological questions related to reef systems. These challenges are closely associated with traditional monitoring methods and include depth restrictions (e.g. safe diving depths for underwater visual census), habitat destruction (e.g. trawling), mortality of target species (e.g. controlled angling and fish traps), and high operating costs (e.g. remotely operated vehicles and large r...

Pakhomov, E A, Bushula, T, Kaehler, S, Watkins, B P, Leslie, R W

Demersal fish community structure, distribution and trophic relationships on the slope (depth range 200–1500 m) of the sub-Antarctic Prince Edward Islands and surrounding sea rises were investigated during a pilot survey conducted in April 2001 onboard fishing vessel MV Iris. A total of 56 fish taxa were collected during the survey, of which 44 were identified to the species level, seven to the genus level and five to the family level. Among the identified taxa, 36 constituted new records for th...

Bushula, T, Pakhomov, E A, Kaehler, S, Davis, S, Kalin, R M

The seasonal dietary composition and estimates of daily consumption rate of Lepidonotothen larseni and Gobionotothen marionensis juveniles were obtained for the first time using fish collected near sub-Antarctic Prince Edward Islands during April 1999–2003. The diet of L. larseni consisted mainly of pelagic prey, with copepods and arrow worms making up the most significant prey groups and accounting for 46% and 40% of prey mass, respectively. The diet of G. marionensis was more diverse than that...

Rathete, Sello Athlone

Thesis (M.Sc. (Physiology)) -- University of Limpopo, 1993. / Refer to the document / University of Limpopo Research Office

Shackleton, L Y

Fossil fish scales hold potential for ellucidating past fish population fluctuations. A system of classification for scales from the pilchard, Sardinops ocellata, and the anchovy, Engraulis capensis, is presented. Both species show an unexpected range of scale types. The classifications reduce errors in distinguishing between the scales of the two species to ±2,5%. Scale loss from these fish is quantified under laboratory conditions. Pilchard lose 1,56 scales/fish/day due to death and 1,50 scale...

Lin, Ding-Rong, 林頂榮

碩士 / 國立臺灣大學 / 海洋研究所 / 82 /

Strandburg-Peshkin, Ariana

<p> Animals that live in groups face a dual challenge of effectively exploiting their environment while at the same time maintaining cohesion with other group members. Maintaining cohesion requires group members to come to consensus about when and where to move, despite the fact that they may not always agree. In this thesis, I investigate how individuals in groups make movement decisions, and how these individual decisions scale up to group-level properties. Using a laboratory experiment with g...

Shirreff, Lisa M.

<p> <i>Mycobacterium marinum</i> (Mm) shares at least 80% amino acid sequence identity with over 3,000 orthologous genes of Mycobacterium tuberculosis (Mtb) and is thus used as a surrogate pathogen for Mtb research. Our laboratory investigates mycobacteriosis using Japanese medaka (<i> Oryzias latipes</i>) as an aquatic animal model. Mm disease presentation in medaka is similar to Mtb disease presentation in humans, including growth in macrophages, granulomatous lesions, and lifelong chronic dis...

Kulpe, Jason

In the open ocean acoustic scattering by SONAR sources can be dominated by large fish schools. Multiple scattering effects are strong and the individual fish air-filled swimbladders scatter in the 1-10 kHz frequency range for most fish sizes. Furthermore, these schools are typically large in comparison to the acoustic wavelength and the individual fish typically swim in nearly periodic arrangements with a separation distance of approximately one body length. Hence, this work takes the perspectiv...

Claxton, Nicholas Xemtoltw

According to W̱SÁNEĆ oral history, the W̱SÁNEĆ people have lived on their territorial homelands back to the time of creation. The W̱SÁNEĆ way of life has been passed on to each succeeding generation through an educational way, centered in large part on the W̱SÁNEĆ Reef Net Fishery. This fishing practice formed the backbone of W̱SÁNEĆ culture and society. Despite being protected by the Douglas Treaty of 1852, over the next 163 years of colonization, the knowledge, ceremony, practice, and educa...

Lindsay, J. E., Long, F. M., Weeks, R. W.

International Telemetering Conference Proceedings / October 18-20, 1977 / Hyatt House Hotel, Los Angeles, California / Propagation from a transmitter/antenna implanted in a fresh water fish is discussed. The choice of operating frequency based upon fish size, antenna efficiency and refraction effects is presented. The implanted linear antenna is placed laterally along the fish. It is shown that for parallel polarization (E in the plane of incidence) the wave, in air, has polarization dependent u...

Miró Pastó, Alexandre

Tesi realitzada al Centre d'Estudis Avançats de Blanes (CEAB-CSIC) / Pyrenean high mountain lakes are naturally fishless due to natural barriers that have prevented the natural colonisation of fish species from lower streams. However, there have been numerous trout introductions to such ecosystems, both in historical and recent periods. Differing from other high mountain regions, some high mountain lakes of the Pyrenees were exploited traditionally for trout cultivation. This activity started at...

Ferrer Maza, Dolors

This PhD thesis evaluates the links between parasitism, condition and reproduction of mature female individuals of three of the most captured fish species in the western Mediterranean Sea: European hake, Merluccius merluccius; red mullet, Mullus barbatus, and European anchovy, Engraulis encrasicolus. Indicators of fish energy reserves (total lipid content in liver, muscle and gonads) and reproductive capacity (fecundity and egg quality) were evaluated, as were the prevalence and intensity of inf...

MacDonald, Kit

Stream and watershed restoration projects have become increasingly common throughout the U.S., and the need for systematic post-project monitoring and assessment is apparent. This study describes three stream and watershed ecological restoration projects and the monitoring and evaluation methods employed or planned to evaluate project successes or failures. The stream and watershed restoration and evaluation methods described in this paper may be applicable to projects of similar types and scale...

Fischer, Jason L.

Master of Science / Department of Biology / Craig Paukert / In-stream dredging is a common practice in rivers worldwide that can affect fish and fish habitat. We investigated the magnitude of these alterations and their influence on the fish community of the Kansas River, a large sand bed river. Fishes were collected monthly from June 2010 to June 2011 in Edwardsville and Lawrence, KS from 12, 1-km reaches (three actively dredged, two historically dredged that have not been dredged in at least...

Holdsworth, Clark T.

Master of Science / Department of Kinesiology / Timothy I. Musch / Impaired vasomotor control in chronic heart failure (CHF) limits the delivery of O[subscript]2 to skeletal muscle during exercise. Previous results demonstrate significant increases in skeletal muscle blood flow (BF) during exercise with omega-3 polyunsaturated fatty acid (PUFA) supplementation via fish oil (FO) versus safflower oil (SO) in healthy rats (Stebbins CL et al., Int J Sport Nutr Exerc Metab 20:475-86, 2010). Whether P...

Perkin, Joshuah Shantee

Doctor of Philosophy / Department of Biology / Keith B. Gido / Habitat fragmentation and loss threaten global biodiversity, but organism responses to changing habitat availability are mediated by structural properties of their habitats. In particular, organisms inhabiting dendritic landscapes with hierarchically arranged branches of habitat tend to have limited access to some patches even in the absence of fragmentation. Consequently, organisms inhabiting dendritic landscapes such as streams r...

Gendusa, Tony C.

Research efforts in aquatic toxicology have historically centered on the chemical analyses and toxic effects of waters to aquatic organisms. More recently, sediment-source toxicity has been explored, with efforts concentrated on establishing sensitive and accurate methodologies. This study focused on the toxicity of trivalent chromium, hexavalent chromium, and fluoranthene to Pimephales promelas, Ictalurus punctatus, and Lepomis macrochirus. Test fish were exposed to both water-borne and sedimen...

Arnold, Winfred R., 1960-

The Trinity River flows through the Dallas-Ft. Worth Metroplex in north central Texas where it receives effluents from numerous point sources including seven large regional wastewater treatment facilities. Historically, the Trinity River has been impacted by massive wastewater loadings which often constitute > 80% of the total river discharge during low flow periods. Normally, high mass loadings correspond to the summer months, compounding the effects of a naturally stressful period, characteriz...

Currie, Rebecca J. (Rebecca Jean)

A total of 670 critical thermal maxima (CTMax) and minima (CTMin) were determined for three freshwater fishes acclimated to three constant temperatures and a diel regimen cycling between the lowest and highest acclimation temperatures. In all species temperature tolerance was directly related to acclimation temperature and slopes relating these variables indicate that acclimation temperature has a greater influence on tolerance of low rather than high temperatures. CTMax and CTMin values generat...

Robertson, William George

The purpose of this investigation was first, to make a histological and cytological study of the testis of male frogs, Rana pipiens, and to determine if there were tissue or cellular changes as well as physiological effects caused by fish pituitary-extract injections. Second, to determine if injections of fish pituitary extract into immature female white mice caused histological changes in the ovaries and uteri.

Sivells, Howard Carroll

This problem was undertaken to determine a suitable combination of fertilizers that would increase the food in a lake, resulting in increased yield of bass and crappie.