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Dissertations / Theses on the topic 'Demersal specie'

Author: Grafiati

Published: 1 April 2023

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1

O'Sullivan, Martha. "Population structure of demersal fish species in the north eastern Atlantic." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources. Restricted: no access until Dec. 31, 2010. Online version available for University members only until June 2, 2011, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=26063.

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2

Kuta, Kevin G. "The Effect of Demersal Reef Fish on Two Species of Gorgonian Coral." NSUWorks, 1992. http://nsuworks.nova.edu/occ_stuetd/356.

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The effect of demersal reef fish on the gorgonians Pterogorgia anceps and Plexaurella grisea was determined under controlled conditions. Demersal reef fish cause significant changes in Pterogorgia anceps zooxanthellae concentration (cells cm-3), bulk density (g cm-3), and spicule concentration (g cm-3). Growth rates as measured by changes in planar area (cm2) are not significantly affected. No significant differences were found among any of the parameters measured for Plexaurella grisea; however, trends in the data were similar to those of P. anceps.

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3

Isidro, Eduardo Jose Louca Florencio. "Biology and population dynamics of selected demersal fish species of the Azores Archipelago." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307638.

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4

Moore, Cordelia Holly. "Defining and predicting species-environment relationships : understanding the spatial ecology of demersal fish communities." University of Western Australia. Faculty of Natural and Agricultural Sciences, 2009. http://theses.library.uwa.edu.au/adt-WU2010.0002.

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[Truncated abstract] The aim of this research was to define key species-environment relationships to better understand the spatial ecology of demersal fish. To help understand these relationships a combination of multivariate analyses, landscape analysis and species distribution models were employed. Of particular interest was to establish the scale at which these species respond to their environment. With recent high resolution surveying and mapping of the benthos in five of Victoria's Marine National Parks (MNPs), full coverage bathymetry, terrain data and accurate predicted benthic habitat

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5

Sampson, Mark Robert. "Modelling the distribution and abundance of several demersal fish species on the Agulhas Bank, South Africa." Thesis, Rhodes University, 2002. http://hdl.handle.net/10962/d1006207.

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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 importance either in numbers or unit mass to the South African demersal trawl fishery. The species al

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6

Chatfield, Brenton Sean. "How to find the one that got away : predicting the distribution of temperate demersal fish from environmental variables." University of Western Australia. School of Earth and Geographical Sciences, 2008. http://theses.library.uwa.edu.au/adt-WU2009.0009.

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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 associations with different environmental variables would enhance our capacity to manage these resou

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7

Guerra, Alessandro. "Estimates of length-at-50% maturity of two South African demersal species: Monkfish, Lophius vomerinus, and Kingklip, Genypterus capensis." Master's thesis, Faculty of Science, 2019. http://hdl.handle.net/11427/31570.

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Long-lived and slow-growing fish species are especially vulnerable to overfishing. Deep-sea species are elusive and difficult to study, making their management challenging. South African monkfish, Lophius vomerinus, and kingklip, Genypterus capensis, are two demersal species living off the west and south coast of South Africa. These species are exploited as bycatch in the Hake fisheries, and represent an important resource for the fishery. However, reproductive information is scarce, and key life-history parameters have not been updated in recent years. Length-at-50% maturity (L50) is a fundam

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8

Lelli, Stefano. "Contribution to a better knowledge of biology, distribution and diversity of demersal species along the Lebanese coast, eastern Mediterranean : a focus on Lessepsian fish species." Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0051.

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L’objectif de cette étude était de contribuer à une meilleure connaissance des espèces démersales dans les eaux côtières libanaises en Méditerranée orientale. Différents aspects relatifs à la distribution, la diversité, et la biologie de ces espèces ont été étudiés. Les données ont été collectées à partir de captures expérimentales dans le cadre du projet ‘CIHEAM-PESCA Libano’. Un mélange hautement diversifié d'espèces de poissons (téléostéens et sélaciens), de céphalopodes et de crustacés, ainsi que de organismes macro-benthiques ont été échantillonnés. La distribution spatio-temporelle et la

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9

Lundy, Caroline. "Genetic structure of demersal fish populations in oceanic environments : implications for management of European hake (Merluccius merluccius), a commercially important species." Thesis, University of East Anglia, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323388.

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10

Mafunda, Patrick Siyambulela. "Aspects of the reproduction of male and female African penguins (Spheniscus demersus) with special reference to sperm biology and cryopreservation." University of the Western Cape, 2018. http://hdl.handle.net/11394/6551.

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Philosophiae Doctor - PhD<br>In the marine environment, penguins have been described as curators and serve a critical role in ecological balance. The African penguin (Spheniscus demersus) has undergone a rapid population decline, mainly due to disturbances in their natural habitat. The African penguin was up-listed from vulnerable to endangered on the IUCN Red List for Threatened Species in 2010 and thus urgent conservation action is required. Integral to long-term conservation action of any species is a basic knowledge of its reproductive biology, which is currently lacking for African pengui

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11

Giliberto, Irene. "Implementazione di un sistema per la classificazione di banchi di pesce da dati di acustica." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6484/.

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La tesi è finalizzata ad una preliminare fase di sperimentazione di un algoritmo che, a partire da dati di acustica, sia in grado di classificare le specie di pesce presenti in cale mono e plurispecifiche. I dati sono stati acquisiti nella fascia costiera della Sicilia meridionale, durante alcune campagne di ricerca effettuate tra il 2002 e il 2011, dall’IAMC – CNR di Capo Granitola. Sono stati registrati i valori delle variabili ambientali e biotiche tramite metodologia acustica e della composizione dei banchi di pesci catturati tramite cale sperimentali: acciughe, sardine, suri, altre speci

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12

King, Nicola Jane. "Deep-sea demersal ichthyofauna of contrasting localities - Mid-Atlantic Ridge, Nazaré Canyon (North Atlantic Ocean) and Crozet Plateau (Southern Indian Ocean) - with special references to the abyssal grenadier, Coryphaenoides (Nematonurus) armatus (Hector, 1875)." Thesis, University of Aberdeen, 2006. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602325.

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The first observations of deep-demersal scavenging fishes are presented from three regions of the world’s oceans with contrasting overlying productivity: the Mid-Atlantic Ridge (MAR) and Nazaré Canyon, Northeast Atlantic Ocean, and the Crozet Plateau, Southern Indian Ocean. The MAR is the most significant topographic feature of the North Atlantic Ocean and is under the influence of a sub-polar front with increased productivity to the north. Twenty-two taxa were photographed at bait; 14 at 42°N and 17 over two transects at 51 and 53°N respectively. Decreases in biodiversity across the 51°N t

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13

Guijarro, González Beatriz. "Population dynamics and assessment of exploited deep water decapods of Balearic Islands (western Mediterranean): from single to multi-species approach." Doctoral thesis, Universitat de les Illes Balears, 2012. http://hdl.handle.net/10803/97300.

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In the western Mediterranean, deep water decapod crustaceans form a considerable fraction of the megafaunal biomass in the upper and middle slope, being a very important component of the catches of the commercial fishery. The main objective of this thesis is to analyse the community and population dynamics of the deep water decapod crustaceans off the Balearic Islands. Data have been obtained from scientific surveys, from the fishing sector and from selectivity pilot studies. Univariate and multivariate techniques have been used to analyse the data. The knowledge derived from this thesis provi

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14

Morfin, Marie. "Dynamiques spatio-temporelles d'espèces démersales clés du golfe du Lion : bénéfices potentiels d’aires marines protégées." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20158.

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Les espèces démersales représentent 50% des captures des pêcheries françaises du golfe du Lion, dont la plupart sont pleinement exploitées, voir surexploitées depuis plusieurs décennies. Cette thèse évalue la pertinence d'aires marines protégées (AMPs) comme outil de gestion et de conservation de ces populations. Jusqu'à présent de telles zones ont été uniquement mises en place le long des côtes pour protéger des espèces très peu mobiles. Le problème est plus complexe pour les espèces vivant en haute mer car leur habitat est plus large et plus diffus. Pour ce faire, la distribution spatiale de

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15

Kide, Saïkou Oumar. "Analyse de la diversité et de la structuration spatio-temporelle des assemblages démersaux dans la zone économique exclusive mauritanienne." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0085/document.

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La zone économique exclusive Mauritanienne est le siège d’upwelling et constitue une zone de transition où cohabitent des espèces d’affinités tempérée et tropicale. Pour comprendre le comportement spatio-temporel des assemblages démersaux du point de vue de leur composition, structuration, distribution de probabilité et diversité face aux préoccupations écologiques. Les facteurs abiotiques contribuent à la structuration des assemblages démersaux persistants au cours du temps. Les effets de la pêche étaient relativement faibles. Les trajectoires temporelles entre les assemblages et les conditio

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16

CRISCOLI, ALESSANDRO. "Distribuzione spaziale di giovanili di specie ittiche di interesse commerciale." Doctoral thesis, 2008. http://hdl.handle.net/11573/392174.

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17

Parra, Hugo Alexandre Esteves. "Habitat predictive modelling of demersal fish species in the Azores." Master's thesis, 2013. http://hdl.handle.net/10400.3/3092.

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Dissertação de Mestrado, Estudos Integrados dos Oceanos, 25 de Março de 2013, Universidade dos Açores.<br>Species distribution modelling of the marine environment has been extensively used to assess species–environment relationships to predict fish spatial distributions accurately. In this study we explored the application of two distinct modelling techniques, maximum entropy model (MaxEnt) and generalized linear models (GLMs) for predicting the potential distribution in the Azores economic exclusive zone (EEZ) of four economically important demersal fish species: blackbelly rosefish, Helicole

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18

Novaglio, C. "Evaluating baseline conditions and resulting changes in demersal fish communities of South East Australia." Thesis, 2016. https://eprints.utas.edu.au/23119/1/Novaglio_whole_thesis.pdf.

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Knowledge of the full extent and severity of ecological changes in human-influenced ecological systems is needed to identify today’s management priorities and to set realistic restoration objectives for the future. However, reconstructing ecosystem baselines and understanding the causes and rates of ecological changes is often hampered by the scarcity of data about population and community status before exploitation, and by the challenges of fitting these (historical) data into modern analytical methods. This study aimed to identify the main sources of fishing impacts on marine communi

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19

Canha, Ângela Maria Lourenço. "Caracterização das rejeições na pescaria de demersais nos Açores." Master's thesis, 2014. http://hdl.handle.net/10400.3/3102.

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Dissertação de Mestrado, Estudos Integrados dos Oceanos, 26 de Fevereiro de 2014, Universidade dos Açores.<br>Desde 2004 que o Departamento de Oceanografia e Pescas da Universidade dos Açores é a instituição responsável pela implementação na Região Autónoma dos Açores de um programa de observação das rejeições da pesca comercial nas pescarias de palangre de fundo. Foram amostradas as rejeições de todas as espécies demersais de acordo com um esquema de amostragem aleatório estratificado baseado na arte de pesca e segmento de frota. O objectivo deste trabalho é caracterizar as rejeições em termo

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20

Chen, Yu-Sheng, and 陳育生. "The diversity and assemblage of demersal fish, and reproductive, condition and feeding cycles of the dominant species in surrounding waters of theThree Northern Isles, Taiwan." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/f7nm6t.

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碩士<br>國立臺灣海洋大學<br>海洋事務與資源管理研究所<br>104<br>The diversity and assemblage of demersal fish, as well as spawning, condition and feeding cycles of the dominant fish species were examined using bi-weekly or monthly samplings and daily catch records from small bottom trawlers operate in surroundings waters of the Three Northern Isles, Taiwan between Nov. 2012 and Dec. 2015. Results indicated that bycatch (both in number and weight) from these vessels was on average, about 50% of the total. These bycatches included ~20-30% (in number), and more than 50% (in weight) of economical important fish species.

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