The ecosystem created by pelagic Sargassum is important in the life histories of a number of economically and ecologically important associated organisms. Fishes play a vital role in this food web and nutrient flow within these systems, but it is unknown how they locate these floating habitats. This study examined the role of natural chemical cues from Sargassum patches and the synthetic chemical Dimethylsulfonionpropionate (DMSP) for an associated fish, the planehead filefish (Stephanolepi...

The Deepwater Horizon oil spill in 2010 prompted an enormous survey effort to assess the under-studied, deep-ocean ecosystems of the Gulf of Mexico. The resulting samples and datasets afforded a unique opportunity to study the ecology of a poorly known group of mesopelagic fishes, the barracudinas (Aulopiformes: Paralepididae). Here we address several important data gaps regarding the ecology of the Paralepididae. Our results indicate that a majority of barracudina species are efficient at ...

The role of Serrivomer beanii in bathypelagic food webs is poorly known, but abundance and biomass estimates from the 2004 G.O. Sars MAR-ECO Expedition suggest it to have a high level of importance. MAR-ECO, a Census of Marine Life field project, has allowed us to increase our knowledge of S. beanii through spatial analysis, including the congeneric species Serrivomer lanceolatoides, and trophic analysis. Serrivomer beanii abundance and biomass exhibited a decreasing trend along the northern Mid...

Trade-offs in traits conferring success in permanent and ephemeral habitats are often at odds with few species being able to persist in both types of environments. I examined the effect of sunfish predators on two species of south Florida crayfish to establish the mechanism that limits one species, Procambarus alleni, to short-hydroperiod environments. The crayfish assemblage response to a gradient of sunfish predators and the effect of predation on P. fallax alone was examined. I also examined ...

Much of the world's oceans lie below a depth of 200 meters, but very little is known about the creatures that inhabit these deep-sea environments. The deep-sea fish family Melamphaidae (Stephanoberyciformes) is one such example of an understudied group of fishes. Samples from the MAR-ECO (www.mar-eco.no) project represent one of the largest melamphaid collections, providing an ideal opportunity to gain information on this important, but understudied, family of fishes. The key to the family prese...

Olaya Marín, Esther Julia

RESUMEN Los peces nativos son indicadores de la salud de los ecosistemas acuáticos, y se han convertido en un elemento de calidad clave para evaluar el estado ecológico de los ríos. La comprensión de los factores que afectan a las especies nativas de peces es importante para la gestión y conservación de los ecosistemas acuáticos. El objetivo general de esta tesis es analizar las relaciones entre variables biológicas y de hábitat (incluyendo la conectividad) a través de una variedad de...

Phosa, Moatladi Jacob

Thesis (M.Dev.) --University of Limpopo, 2018 / The purpose of this study was to investigate the contribution of small-scale fish farming sub-sector to rural income generation in Thulamela Municipality in Limpopo Province, South Africa.The study applied a qualitative method to collect data from individual respondents of same characteristics using the semi-structured interview involving 15 small scale fish farmers. The findings from the study revealed that in terms of gender, more men were p...

Saul, G. E.

Ph. D.

Cheng, Hsiang-tai

Ph. D.

Moore, Christopher Miles

Ph. D.

Gabbay, Igal

While an information retrieval system takes as input a user query and returns a list of relevant documents chosen from a large collection, a question answering system attempts to produce an exact answer. Recent research, motivated by the question answering track of the Text REtrieval Conference (TREC) has focused mainly on answering ‘factoid’ questions concerned with names, places, dates etc. in the news domain. However, questions seeking definitions of terms are common in the logs of search eng...

Muñoz Mas, Rafael

This dissertation focused in the comprehensive analysis of the capabilities of some non-tested types of Artificial Neural Networks, specifically: the Probabilistic Neural Networks (PNN) and the Multi-Layer Perceptron (MLP) Ensembles. The analysis of the capabilities of these techniques was performed using the native brown trout (Salmo trutta; Linnaeus, 1758), the bermejuela (Achondrostoma arcasii; Robalo, Almada, Levy & Doadrio, 2006) and the redfin barbel (Barbus haasi; Mertens, 1925) as target...

by Henry, Kam-yin Cheung. / Thesis (M.Ph.)--Chinese University of Hong Kong, 1988. / Bibliography: leaves 119-126.

Halstead, William Robert, III

<p> Relying on field research to complete the life history for certain fish species can be inadequate, but laboratory research can be used to fill these gaps. These gaps exist for Bonefish (<i>Albula</i> spp.), a tropical marine fish and popular sportfish. In this study, aquaculture techniques were applied to Bonefish in a captive setting at Harbor Branch Oceanographic Institute (HBOI) and Cape Eleuthera Institute (CEI) to induce spawning and describe early ontogeny. Photothermal manipulations a...

Hanna, Heather Lea

<p>Can public organization managers respond to rapidly changing environmental conditions given that stability is a primary societal function of bureaucracies? If so, how might they successfully bring about change? Bennis (1966) states that examinations of organizational change fall into two categories: 1) those attempting to explain why organizations change and 2) those attempting to explain how organizations change. Those exploring why organizations change question the degree to which managers ...

Parra Boronat, Lorena

Se están realizando muchos esfuerzos en la acuicultura para alcanzar la sostenibilidad, sin embargo aún está lejos de ser sostenible. Sus impactos sobre el medio ambiente pueden prevenirse y corregirse mediante el uso de sensores, desarrollando la conocida como acuicultura de precisión. La calidad del agua afecta el rendimiento de los peces. La temperatura y la salinidad son algunos factores que afectan al crecimiento de los peces. Sin embargo, otros factores como la turbidez, el fotoperíodo y e...

Oduntan, Afolake Olufunmilola

A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of requirements for the degree of Master of Science. Johannesburg 2014 / Polycyclic Aromatic Hydrocarbons (PAHs) are environmental contaminants which are formed during combustion of organic material such as coal, petroleum compounds and meat. Other sources of PAHs include automobile exhaust, coal tar and crude oil. Natural sources of PAHs include volcanoes, forest fires. Some PAHs are...

Willis, Lauren

Despite the fact that fish are a common component of coastal and other aquatic archaeological sites, fish bone taphonomy--including bone surface modifications and the effects of burial--remains woefully understudied. Various ethnographic accounts describe fish butchering techniques for immediate consumption and drying, yet cut marks are rarely reported on archaeological fish remains. To address a significant gap in our understanding of fish taphonomy, I devised an experimental research program a...

Tisa, Mark Steven

Ph. D.

Zerbini, Ercole

Ph. D.

Chauke, Erasmus

ABSTRACT Lipid classes and fatty acid composition (nutritive quality) of three commercially important fresh water fish species Oreochromis Mossambicus (Mozambique Tilapia), Clarias Gariepinus (Sharptooth Catfish) and Cyprinus Carpio (Carp) obtained from an aquaculture, different river systems and fish markets in South Africa were investigated. Fish fillets were prepared in the laboratory and used as representative samples for extraction of lipids through the Folch extraction method (using ...

Melanson, Alexandre

Neural systems are often stochastic, non-linear, and non-autonomous. The complex manifestation of these aspects hinders the interpretation of neuroscientific data. Neuroscience thus benefits from the inclusion of theoretical models in its methodology. Detailed biophysical models of neural systems, however, are often plagued by high-dimensional and poorly constrained parameter spaces. As an alternative, data-driven effective models can often explain the core dynamical features of a dataset with ...

Zeni, Jaquelini de Oliveira.

Orientador: Lilian Casatti / Coorientador: David J. Hoeinghaus / Banca: Dana Infante / Banca: Jani Heino / Banca: Robert Hughes / Banca: Tadeu Siqueira Barros / Resumo: Mudanças ambientais associadas a conversão da vegetação nativa em agroecossistemas são consideradas um poderoso motor de homogeneização da ictiofauna no Antropoceno. Assim, é primordial entender como subsequentes alterações em ambientes já impactados podem afetar o ambiente aquático e as assembleias de peixes. Avaliar se e como s...

Stumpp, Vincent Joseph

Thesis (M.B.A.)--Boston University

Karlberg, Ylva

In a changing climate, it is increasingly important to be able to model environmental effects on food webs, and to do that, one must have appropriate dynamic models. I present a shallow lake ecosystem model where producers, grazers, carnivores, piscivores, and detritivores are coupled through resource (light, nutrients and detritus) fluxes between the benthic and pelagic habitats and through carnivore life history events (ontogenetic habitat and diet shifts). The two habitats each contain primar...

Reeder, D. Benjamin (Davis Benjamin), 1966-

Thesis (Ph. D.)--Joint Program in Applied Ocean Physics and Engineering (Massachusetts Institute of Technology, Dept. of Ocean Engineering and the Woods Hole Oceanographic Institution), 2002. / Includes bibliographical references (leaves 140-148). / This thesis investigates the complexities of acoustic scattering by finite bodies in general and by fish in particular through the development of an advanced acoustic scattering model and detailed laboratory acoustic measurements. A general acoustic ...

Maertens, Audrey (Audrey Paulette Solange)

Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015. / Cataloged from PDF version of thesis. / Includes bibliographical references (pages 145-159). / When walking, driving or riding a bicycle, we mostly rely on vision to avoid obstacles and evaluate optimal paths. Underwater, vision is usually limited, but flow structures resulting from the hydrodynamic interactions between inert and/or living bodies contain rich information, which fish can read thro...

Kadri, Romi Sinclair

Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014. / Cataloged from PDF version of thesis. / Includes bibliographical references (page 30). / Immunology researchers require a new type of fish tank that provides a linear thermal gradient for experimental zebrafish in order to improve the accuracy and validity of their research. Zebrafish require the ability to select their surrounding water temperature in order to react to a simulated viral infection ...

Davidson, S. Naomi (Sarah Naomi)

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005. / Includes bibliographical references. / Fish possess a greater degree of agility, maneuverability, and energy efficiency over current underwater vehicles constructed by engineers. Kinematics studies show that a high degree of three-dimensional control of multiple active surfaces distributed around an undersea vehicle's center of mass is critical to achieve fish-like superior performance. However, curren...

Horodyski, Robert J

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1968. / Bibliography: leaves 191-192. / by Robert J. Horodyski. / M.S.

Mendelson, Leah Rose

Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2013. / This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections. / Cataloged from student-submitted PDF version of thesis. / Includes bibliographical references (pages 81-86). / Abstract This thesis details the implementation of a three-dimensional PIV system to study the hydrodynamics of freely swimming Giant Danio (...

Yi, Dong Hoon

Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2018. / Cataloged from PDF version of thesis. / Includes bibliographical references (pages 177-194). / The recent fish population decline due to increased human presence has led to calls for predictive methods to help reverse or stabilize the situation. It has been difficult, however, to establish such methods primarily due to the technical obstacles in observing fish populations in natural habitats. Her...

Buckman, Kate Lynn

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 2009. / Cataloged from PDF version of thesis. / Includes bibliographical references. / A study of the ecology of fish endemic to hydrothermal vents on the East Pacific Rise was undertaken utilizing a variety of techniques, focusing on the bythitid Thermichthys hollisi. Stable isotope and gut content analyses were used to elucidate prey choice and trophic relationships. Otolith chemical signatures were investigated to deter...

Watts, Matthew Nicholas

Thesis (S.M. in Oceanographic Engineering)--Joint Program in Ocean Engineering/Applied Ocean Physics and Engineering (Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and the Woods Hole Oceanographic Institution), 2006. / Includes bibliographical references (p. 74-75). / Mean maximum start-up accelerations and velocities achieved by the fast-start specialist, northern pike, are reported at 120 ms-2 and 4 ms-1, respectively (Harper and Blake, 1990). In this thesis, a simple...

Laubu, Chloé

Au cours de leur vie, les animaux doivent sans cesse prendre des décisions qui impactent leur survie et leur succès reproducteur. L’objectif de cette thèse était d’étudier le rôle de deux sources de variabilité dans la prise de décision — la personnalité et l’état émotionnel — en contexte sexuel chez un poisson monogame, le cichlidé zébré. Nos travaux sur la personnalité ont mis en évidence son importance sur la compatibilité comportementale et le succès reproducteur des partenaires. De plus, le...

Duncan, Murray Ian

The persistence of harvested fish populations in the Anthropocene will be determined, above all, by how they respond to the interacting effects of climate change and fisheries exploitation. Predicting how populations will respond to both these threats is essential for any adaptive and sustainable management strategy. The response of fish populations to climate change is underpinned by physiological rates and tolerances, and emerging evidence suggests there may be physiological-based selection in...

HEINCLOVÁ, Pavla

The predation effects of four fish species on the consumption of free-living cercariae of three trematode species (Plagiorchis elegans, Echinoparyphium aconiatum and Trichobilharzia szidati) were experimentally investigated with regard to specific life-history traits of both predator and parasite. The study provides evidence of a considerable consumption of trematode cercariae by fish and confirms that cercariae play an important ecological role in the energy flow in aquatic food webs.

Nordby, Linda

Against a backdrop of local, regional and national conflicts the former generals now in government, have decided to focus on tourism and have worked hard since 2010 to develop Burma’s tourism sector. Ngapali, a small costal community in Rakhine state has been developed into a tourism destination with hotels and restaurants, all located on a beautiful beach. Tourism has great implications for communities, both negative and positive. For Ngapali the development of tourism led to an increased amoun...

Koch, Erich

Includes abstract. / Includes bibliographical references (leaves 55-61). / An Age Structured Model (ASM) was develop in which dynamic and density-dependent cannibalism was included as a top-down control on a modeled population of M. paradoxus which used spawner biomass and maternal based recruitment. The ASM was used to evaluate the effects cannibalism had on age structure, recruitment and spawner biomass of the modeled population. The development of the model was described and evaluated with sp...

Clark, Barry Malcolm

Bibliography: leaves 188-216. / The main objectives of this study were to examine, by means of beach seine netting, the composition, abundance and size structure of fish assemblages frequenting surf-zone habitats in the south-western Cape, South Africa, to investigate temporal and spatial variations in these assemblages in relation to physical environmental parameters, and to assess the importance of this habitat as a nursery and feeding ground for littoral fish. In all, 54 fish species from 29 ...

Arpin, Sheree

Perissodus microlepis is a species of cichlid fish endemic to Lake Tanganyika (Africa). Adult P. microlepis are lepidophages, feeding on the scales of other living fish. As an adaptation for this feeding behavior P. microlepis exhibit lateral asymmetry with respect to jaw morphology: the mouth either opens to the right or left side of the body. Field data illustrate a temporal phenotypic oscillation in the mouth-handedness, and this oscillation is maintained by frequency-dependent selection. ...

Rinne, John N., Deason, Brian

From the Proceedings of the 2000 Meetings of the Hydrology Section - Arizona-Nevada Academy of Science - April 15, 2000, University of Arizona, Tucson, Arizona

Worischka, Susanne

The prey consumption by benthivorous fish predators can have profound top-down effects in stream food webs. To analyse this effects in small temperate stream ecosystems, a long-term field experiment was conducted in two streams in South-eastern Germany, Gauernitzbach and Tännichtgrundbach, from 2004 to 2011. The densities of two small-bodied benthivorous fish species, gudgeon (Gobio gobio) and stone loach (Barbatula barbatula), were manipulated following a Before-After-Control-Impact design. The...

Cathcart, Charles Nathan

Master of Science / Department of Biology / Keith B. Gido / Recognizing habitat needs of fishes across space and time is increasingly important for managing altered stream networks, such as in the Colorado River basin. Recent work on warm-water fishes suggest they might benefit from access to tributaries and their confluences. Fish movements or distributions within tributaries relative to distance from mainstem confluences in two streams with different network types (linear versus dendritic) ...

Lipschitz, Steven

Bibliography: pages 134-147. / Pollution control regulations directed at the land-based factories of the Southern African fish processing industry do not appear to promote the required level of investment in pollution control systems. Two self-administered mail-questionnaires comprising undisguised fixed-alternative and open-ended questions were constructed to survey the opinions and viewpoints of a census consisting of twenty-seven senior managers responsible for making pollution control invest...

Van Heerden, Mattheus Johannes

There are many optimistic and pessimistic views on integrated quality management systems based on international standards. Many businesses have not benefited in terms of operational, quality or business performance, while many others have indicated that the implementation of integrated quality management systems based on an international system standard or other standards has led to improved operational performance and quality, which in turn has resulted in improved business results. The main re...

Garifo, Susan Ellen

No description available.

Villet, William de Gouret

Thesis (MBA)--Stellenbosch University, 2001. / ENGLISH ABSTRACT: Fish and shellfish are, with very few exceptions, generally considered safe. Food safety laws in many parts of the world are, however, requiring companies to implement programs such as Hazard Analysis Critical Control Point (HACCP) as a means of assuring food safety from harvest to consumption. In South Africa, fishing companies wishing to export products to countries such as the European Union (EU), the United Sates (US), et...

Du Preez, A. J.

Thesis (MBA (Business Management))--University of Stellenbosch, 2009. / ENGLISH ABSTRACT: Through the continual pursuit to reduce wastage through converting unmarketable by-products into a form that can be sold or used, it was established that an opportunity was available to refine poor-quality fish oil into a fuel source for internal use by a company. By commissioning a biodiesel refinery at the pelagic fish-processing facility of Pioneer Fishing (Pty) Ltd, it will be possible to refine the fis...

Esterhuyse, M. M.

Thesis (MScAgric)--University of Stellenbosch, 2002. / ENGLISH ABSTRACT: Forming part of a conservation programme, this study was concerned with two species of Cichlid fish (Oreochromis mossambicus and O. ni/oticus), which were brought into contact with each other by unnatural ways. They are now hybridizing to some extent and there is also evidence that the foreign O. ni/oticus may out compete the native O. mossambicus. To cast light on what the current distribution is of both these specie...