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Dissertations / Theses on the topic 'Sea lice; Salmon farms'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Banks, Bryony Alison. "Genetic characterisation of populations of the ectoparasitic copepod Lepeophtheirus salmonis (Kroyer, 1837) in Scotland." Thesis, University of Stirling, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391306.

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2

Penston, Michael. "Dynamics of planktonic larval sea louse distribution in relation to Atlantic salmon (Salmo salar L.) farms in a Scottish sea loch." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=25799.

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Thesis (Ph.D.)--Aberdeen University, 2009.<br>Title from web page (viewed on June 26, 2009). With: Spatial and temporal distribution of Lepeophtheirus salmonis (Krøyer) larvae in a sea loch containing Atlantic salmon, Salmo salra L., farms on the north-west coast of Scotland / M. J. Penston ... et al. Journal of fish diseases. 2008: 31, 361-371. With: Reduced Lepeophtheirus salmonis larval abundance in a sea loch on the west coast of Scotland between 2002 and 2006 / Michael J. Penston, Colin P. Millar, Ian Davies. Dis. Aquat. Org. 2008: 81, 109-117. Includes bibliographical references.

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3

Wadsworth, Simon Leigh. "The control of sea lice Lepeophtheirus salmonis (Kroyer, 1837) (Copepoda: Caligidae) on Atlantic salmon Salmon salar L., production sites." Thesis, University of Aberdeen, 1998. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU532684.

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Sea lice Lepeophtheirus salmonis are the major pathogen affecting the salmon farming industry. Current methods of control, especially in the UK, are largely ineffective as they do not affect the chalimus stages of L. salmonis and are toxic to fish. Greater control of L. salmonis through improved management, more effective compounds, disease control and stock selection were examined. The epidemiology of L. salmonis on Atlantic salmon Salmo salar production sites was examined at a number of farms within Loch Sunart. Intensity of infection was found to be influenced by both management practices a

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4

Micallef, Giulia. "Understanding the molecular basis of dietary protection against sea lice in Atlantic salmon : application of proteomics and transcriptomics." Thesis, University of Aberdeen, 2013. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=204953.

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Yeast cell wall (YCW) extracts have long been regarded as beneficial supplements in aquaculture feeds, especially with respect to immunomodulation. Previous studies have shown that supplementing salmon diets with YCW extracts increases resistance to sea lice. During the series of three trials, different sea lice challenge models and YCW extracts were studied. In Trial 1, fish fed a diet containing 0.4% YCW #a exhibited a significant reduction in sea lice burden of 23% compared to the control diet. The skin and skin mucus samples from Trial 1 were hence used for high-throughput screening of alt

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5

Frenzl, Benedikt. "Understanding key factors associated with the infection of farmed Atlantic salmon by the salmon louse Lepeophtheirus salmonis." Thesis, University of Stirling, 2015. http://hdl.handle.net/1893/22320.

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The objective of the work described in the current thesis was to provide a better understanding of some of the key factors associated with sea louse, Lepeophtheirus salmonis, infection of farmed Atlantic salmon. In Chapter 2, initial work focused on establishing the vertical and horizontal distribution of sea lice copepodids and spatial patterns of on-farm infections. The louse distribution was investigated along the main current gradient across adjacent salmon production pens at three commercial sites. A depth profile for the distribution of larval lice was also established for the top 12 m o

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6

Liu, Yajie. "An analysis of the management and economics of salmon aquaculture." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/323.

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Salmon aquaculture can be a potential solution to bridge the gap between declining capture fisheries and increasing seafood demand. However, the environmental impacts it creates have generated criticism. The overall objectives of this dissertation are to examine the economic consequences of environmental issues associated with salmon aquaculture, and to explore policy implications and recommendations for reducing environmental impacts. These objectives are addressed in five main analyses. The growth of salmon aquaculture is analyzed based on farmed salmon production in the four leadin

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7

Tsai, Hsin Yuan. "Genomic basis of growth traits and host resistance against sea lice (L. Salmonis) in Atlantic salmon (S. Salar)." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28918.

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Background Atlantic salmon (Salmo Salar) is a key aquaculture species in several countries. Since its critical role in economic sector and scientific research, this species has been relatively extensively investigated, in comparison with other farmed and wild aquatic species. However, the genetic components associated with growth and fillet-related traits are lack consistency, and the issue of sea louse disease in both wild and famed salmon is still unsolved. Objectives Overall aim of this project was to understand the genetic basis of growth-related traits and host resistance to sea lice usin

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8

Sackville, Michael. "Of saline and sea lice : hydromineral challenges and osmoregulatory strategies associated with early ocean entry of juvenile pink salmon (Oncorhynchus gorbuscha)." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/27218.

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Pink salmon (Oncorynchus gorbuscha) enter seawater (SW) following gravel emergence at a body mass of 0.2 g. Two hydromineral challenges associated with this remarkable early ocean entry were investigated: (1) initial exposure to a hyper-osmotic environment and (2) sea louse (Lepeophtheirus salmonis) parasitism. To survive SW, pink salmon were hypothesized to develop hypo-osmoregulatory abilities as larval alevins prior to natural SW entry as post-larval fry. To test this, alevins and fry were transferred from freshwater (FW) in darkness to SW under a simulated natural photoperiod (SNP). Ionor

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9

Nendick, Laura J. "The swimming performance and post-swim body ion concentrations of juvenile pink salmon, and the effect of parasitic sea lice on these parameters." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/12630.

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Pink salmon (Oncorhynchus gorbuscha Walbaum) stocks in the Broughton Archipelago BC have seen a general decline in recent years. This is thought to be due to parasitism by sea lice, Lepeophtheirus salmonis (Krøyer, 1837), on pink salmon during early marine life stage. To investigate this, I measured swimming performance, an integrated measure of fish health, and post-swim body ion concentrations, a secondary stress response, of control and sea lice infected juvenile pink salmon (mass < 3.0 g). Using five different protocols (ranging in duration from 8 – 112 min), four constant acceleration te

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10

Gravil, Helen Ruth. "Studies on the biology and ecology of the free swimming larval stages of Lepeophtheirus Salmonis (Kroyer, 1838) and Caligus Elongatus Nordmann, 1832 (Copepoda: Caligidae)." Thesis, University of Stirling, 1996. http://hdl.handle.net/1893/2380.

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The study investigated biological and ecological parameters controlling and influencing the production and distribution of the free-swimming larval stages of Lepeophtheirus salmonis (Kroyer, 1838), and to a lesser extent Caligus elongatus Nordmann 1832, in the natural environment The reproductive output of L. salmonis was influenced by seasonal effects. The number of eggs produced per brood showed an inverse relationship with increasing temperature. The number of eggs per brood was also influenced by adult female body size (cephalothorax length), which in itself exhibited an inverse relationsh

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11

Campbell, Patrick Jon. "Effectiveness of teflubenzuron for treating sea lice on Atlantic salmon, randomized control clinical trial, historical control clinical trial, and an assessment of outcome measurements and sampling methods." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0017/MQ48796.pdf.

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12

Noack, Patrick T. "Carotenoid pigments as phenotypic tracers of salmonid life histories : studies on eggs, alevins and juveniles of trout (Salmo trutta L.) and sea lice of Atlantic salmon (Salmo salar L.)." Thesis, University of Aberdeen, 1997. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU483277.

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The use of carotenoid pigments as an archive of feeding behaviour and thus as environmental markers was tested using eggs and juveniles of sea trout and brown trout (Salmo trutta L.) invertebrates from the River Don and ectoparasitic lice (Lepeophtheirus salmonis Kroyer) of Atlantic salmon (Salmo salar L.). Carotenoids were analysed by normal phase high performance liquid chromatography (HPLC) and the resulting peaks examined in multivariate analyses. Analysis of trout eggs of known parentage suggested that the pigment profile of each egg reflects the migratory history of the maternal fish and

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13

Carmichael, Stephen N. "An investigation into the molecular determinants of salmon louse (Lepeophtheirus salmonis (Krøyer, 1837)) susceptibility to the antiparasitic drug emamectin benzoate." Thesis, University of Stirling, 2013. http://hdl.handle.net/1893/19526.

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Caligid copepods, also called sea lice, are ectoparasites of marine fish, with Lepeophtheirus salmonis (Krøyer, 1837) emerging as a problem for mariculture of Atlantic salmon (Salmo salar Linnaeus, 1758) in the northern hemisphere. Annual costs of sea lice to global salmon farming was estimated to be in excess of €300 million in 2006, with the majority of this accounted for through expenses accrued from chemical treatments. Only a limited range of anti-sea louse drugs are available and licensed for the treatment of fish, and the continued use of only a few compounds creates a situation potenti

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14

Heumann, Jan H. "The potential role of ABC transporters as factors influencing drug susceptibility in the salmon louse, Lepeophtheirus salmonis (Kroyer, 1837)." Thesis, University of Stirling, 2014. http://hdl.handle.net/1893/21812.

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Efficient control of sea lice is a major challenge for the sustainable production of farmed Atlantic salmon (Salmo salar (Linnaeus, 1758)). These marine ectoparasites feed on mucus, skin and blood of their hosts, thereby reducing the salmon’s growth rate and overall health. In the northern hemisphere, the most prevalent species is Lepeophtheirus salmonis (Krøyer, 1837). In 2006, global costs of sea lice infections are estimated to have exceeded €300 million, with the majority spent on a limited number of chemical delousing agents. Emamectin benzoate (EMB; SLICE®), an avermectin, has been widel

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15

Price, Michael Harold Howard. "Early marine ecology of Pacific salmon: interactions with sea lice." Thesis, 2011. http://hdl.handle.net/1828/3692.

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Pacific salmon (Oncorhynchus spp.) are key elements of ecological systems, and play an important role in the cultural foundation of human societies. All species of wild salmon face multiple, simultaneous threats, with habitat degradation likely playing a key role in survival. Open net-pen salmon farms can degrade important nursery marine habitat for wild juvenile salmon by disrupting natural salmonid host-parasite dynamics. The first two chapters in this thesis examine louse parasitism of wild juvenile chum (Oncorhynchus keta), pink (O. gorbuscha), and sockeye salmon (O. nerka) in relation to

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16

Peet, Corey Ryan. "Interactions between sea lice (Lepeoptheirus salmonis and Caligus clemensii), juvenile salmon (Oncorhynchus keta and Oncorhynchus gorbuscha) and salmon farms in British Columbia." Thesis, 2007. http://hdl.handle.net/1828/2346.

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The issue of sea lice (Lepeoptheirus salmonis and Caligus clemensii) transfer from salmon farms to wild salmon is a controversial topic in British Columbia (BC). A series of sea lice epizootics (four in five years) on juvenile chum (Oncorhynchus keta) and pink (0. gorbuscha) salmon in the Broughton Archipelago (BA), an area with the highest density of salmon farms on the west coast, have caused significant concern among conservationists, local First Nations, and the general public over the possible impacts of salmon farms on wild salmon. Key to the debate has been a lack of data on ambient sea

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17

Sutherland, Ben James Gerard. "Comparative responses of salmon to sea lice Lepeophtheirus salmonis infections, and lice responses to chemical and environmental stressors." Thesis, 2014. http://hdl.handle.net/1828/5421.

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Systems biology methods can provide novel insight into the responses of an organism to a suboptimal environment, an infection or exposure to a xenobiotic. In the interaction of salmon and salmon lice, there are several areas requiring further research. These include the impacts of lice infection on wild salmon, response mechanisms of different salmon species or life stages to lice infections, effects of environmental conditions on lice stress, and mechanisms underlying the emergence of resistance to important parasiticidal chemicals. Here, I combine global gene expression analyses with phenoty

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18

Wagner, Glenn Nick. "Assessing the physiological impact of sea lice (Lepeophtheirus salmonis krØyer) on Atlantic salmon (Salmo salar L.)." Thesis, 2003. http://hdl.handle.net/2429/15145.

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The objective of this thesis was to investigate the physiological changes that sea lice (Lepeophtheirus salmonis) cause in Atlantic salmon (Salmo solar). Sea lice are parasitic copepods that naturally infect salmonids in low numbers across the Northern Hemisphere with infrequent epizootics. The increase in the period of these epizootics in wild salmonids has mirrored the rise of the aquaculture industry in coastal areas. Therefore, it is important to answer basic physiological questions about parasite-host interactions such as sub-lethal lice levels required to affect performance, and th

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19

Byrne, Allison. "Pacific oyster (Crassostrea gigas) and Atlantic salmon (Salmo salar) integrated multi-trophic aquaculture in British Columbia: investigation of bivalve growth and natural sea lice mitigation." Thesis, 2016. http://hdl.handle.net/1828/7283.

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The close proximity of net-pen salmon farms and wild Pacific salmon stocks in British Columbia (BC) is an incentive for precautionary management of the environmentally and economically damaging parasites known as sea lice. Bivalves cultured as part of an integrated multi-trophic aquaculture (IMTA) system may contribute natural, preventative louse control through the ingestion of planktonic sea lice larvae. A field trial was conducted to test sea lice mitigation by bivalves at a commercial Atlantic salmon (Salmo salar) farm in BC using Pacific oysters (Crassostrea gigas). Oysters were cultured

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20

Messmer, Amber Marie. "Evaluation of population structure in Pacific Lepeophtheirus salmonis (Krøyer) using polymorphic single nucleotide and microsatellite genetic markers: evidence for high gene flow among host species and habitats." Thesis, 2014. http://hdl.handle.net/1828/5620.

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Parasitic copepods including Lepeophtheirus salmonis have been the focus of strong concern for the health of wild and farmed salmonids in the Pacific and Atlantic Oceans. Salmon are highly valuable species from both socioeconomic and ecological perspectives. The host-parasite dynamics of Lepeophtheirus salmonis and the Atlantic and Pacific salmonids have changed over evolutionary time to the point that both Atlantic and Pacific salmon and Atlantic and Pacific Lepeophtheirus salmonis are genetically distinct. Recent human interference with the natural population dynamics of this parasite and it

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