Effects of host density on furunculosis epidemics determined by the simple SIR model

Öğüt, Hamdi; LaPatra, Scott E.; Reno, Paul W.

doi:10.1016/j.prevetmed.2005.06.001

Cited by 34 publications

(23 citation statements)

References 16 publications

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“…This behaviour was forced by DO conditions in the beginning, but the fish stayed aggregated even after the DO deficiency disappeared and DO rose up to 4.0 mg·L −1 . A large aggregation of fish brings many additional aspects, including the formation of biogeochemical hotspots (places where nutrient release by animals exceeds the need of primary producers) (Boulêtreau et al, 2011) or facilitation of spread of disease (Arneberg et al, 1998;Ogut et al, 2005). We hypothesise that the reason why the fish stayed aggregated and why they did not move back to their previous HR is connected to low temperature, which could inhibit the activity of fish.…”

Section: Id -Identification Number Of Individualmentioning

confidence: 96%

Move or die: change in European catfish (Silurus glanisL.) behaviour caused by oxygen deficiency

Daněk

Kalous

Petrtýl

et al. 2014

Knowl. Managt. Aquatic Ecosyst.

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Key-words:invasive species, Silurus glanis, winter, behaviour, hypoxia European catfish (Silurus glanis L.) is a large predatory fish native to an extensive area in Europe. It has been introduced to its western and southern parts, where it is considered an invasive species with a negative impact on native fishes. European catfish is a territorial species exhibiting site fidelity. Cold water in winter usually leads catfish to exhibit notably low activity. Nevertheless, our telemetric study on 19 juvenile individuals of S. glanis provides information on their unexpected high activity and displacement in winter. Our data reveal that these behavioural changes were caused by oxygen deficiency. Our data also indicate that oxygen deficits may induce migrations of this species. RÉSUMÉBouger ou mourir : changement de comportement du silure glane (Silurus glanis L.) causé par un manque d'oxygène Mots-clés : espèces envahissantes, Silurus glanis, hiver, comportement, hypoxieLe silure glane (Silurus glanis L.) est un grand poisson prédateur indigène à une vaste aire en Europe. Il a été introduit dans les parties occidentales et méridio-nales de cette aire, où il est considéré comme une espèce envahissante ayant un impact négatif sur les poissons indigènes. Le silure glane est une espèce territoriale présentant une fidélité au site. L'eau froide en hiver entraîne généralement le silure glane à présenter notamment une faible activité. Néanmoins, notre étude té-lémétrique sur 19 individus juvéniles de S. glanis fournit des informations sur leur activité élevée inattendue et leur déplacement en hiver. Nos données révèlent que ces changements de comportement ont été causés par un manque d'oxygène. Nos données indiquent également que les déficits d'oxygène peuvent provoquer des migrations de cette espèce.

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Section: Id -Identification Number Of Individualmentioning

confidence: 96%

Move or die: change in European catfish (Silurus glanisL.) behaviour caused by oxygen deficiency

Daněk

Kalous

Petrtýl

et al. 2014

Knowl. Managt. Aquatic Ecosyst.

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“…Contact-based diseases also exist in the marine environment, most frequently in fishes (e.g., Lotz and Soto 2002, Løvdal and Enger 2002, Ogut et al 2005, being common in the case of the transmission of multicellular parasites such as trematodes or cestodes (Huspeni and Lafferty 2004). Although some authors (Dobson and May 1987, Ogut et al 2005, Krkošek 2010) formulated contact-based MID models based on the Kermack and McKendrick (1927) model, other MID transmission processes are different in nature from those on land, and adapting the KermackMcKendrick models requires the appreciation and incorporation of these fundamental differences , McCallum et al 2004.…”

Section: Introductionmentioning

confidence: 99%

“…Although some authors (Dobson and May 1987, Ogut et al 2005, Krkošek 2010) formulated contact-based MID models based on the Kermack and McKendrick (1927) model, other MID transmission processes are different in nature from those on land, and adapting the KermackMcKendrick models requires the appreciation and incorporation of these fundamental differences , McCallum et al 2004.…”

Section: Introductionmentioning

confidence: 99%

Marine infectious disease dynamics and outbreak thresholds: contact transmission, pandemic infection, and the potential role of filter feeders

Bidegain

Powell

Klinck³

et al. 2016

Ecosphere

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Abstract. Disease-causing organisms can have significant impacts on marine species and communities.However, the dynamics that underlie the emergence of disease outbreaks in marine ecosystems still lack the equivalent level of description, conceptual understanding, and modeling context routinely present in the terrestrial systems. Here, we propose a theoretical basis for modeling the transmission of marine infectious diseases (MIDs) developed from simple models of the spread of infectious disease. The models represent the dynamics of a variety of host-pathogen systems including those unique to marine systems where transmission of disease is by contact with waterborne pathogens both directly and through filter-feeding processes. Overall, the analysis of the epizootiological models focused on the most relevant processes that interact to drive the initiation and termination of epizootics. A priori, systems with multistep disease infections (e.g., infection-death-particle release-filtration-transmission) reduced dependence on individual parameters resulting in inherently slower transmissions rates. This is demonstrably not the case; thus, these alternative transmission pathways must also considerably increase the rates of processes involved in transmission. Scavengers removing dead infected animals may inhibit disease spread in both contact-based and waterborne pathogen-based diseases. The capacity of highly infected animals, both alive and dead, to release a substantial number of infective elements into the water column, making them available to suspension feeders results in such diseases being highly infective with a very small "low-abundance refuge". In these systems, the body burden of pathogens and the relative importance between the release and the removal rate of pathogens in the host tissue or water column becomes paramount. Two processes are of potential consequence inhibiting epizootics. First, large water volumes above the benthic susceptible populations can function as a sink for pathogens. Second, unlike contact-based disease models in which an increase in the number of susceptible individuals in the population increases the likelihood of transmission and epizootic development, large populations of filter feeders can reduce this likelihood through the overfiltration of infective particles.

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“…In British Columbia (western Canada), the Sea Lice Management Strategy adopted in 2003 requires management action when total motile (adult and preadult) L. salmonis abundances exceed 3 per fish during the juvenile pink salmon juvenile migration between March and July (Saksida et al 2011). Ireland has maintained a national Sea Lice Monitoring Programme for salmonid mariculture since 1991 (O'Donohoe et al 2013) (O'Donohoe et al 2013, p. 3). Data are published annually and serve in part 'to provide management information to drive the implementation of control and management strategies'.…”

Section: Mitigating Factors and Spillbackmentioning

confidence: 99%

Disease management mitigates risk of pathogen transmission from maricultured salmonids

Jones¹,

Bruno²,

Madsen³

et al. 2015

Aquacult. Environ. Interact.

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Open marine net pens facilitate virus and sea lice transfer, occasionally leading to infections and outbreaks of disease in farmed salmon. A review of 3 salmon pathogens (infectious salmon anaemia virus [ISAV], salmon alphavirus [SAV] and the salmon louse Lepeophtheirus salmonis) shows that increased risk of exposure to neighbouring farms is inversely related to distance from and directly related to biomass at the source of infection. Epidemiological techniques integrating data from oceanography, diagnostics and pathogen shedding rates and viability contribute to improved understanding of pathogen transmission pathways among farms and permit the designation of areas of risk associated with sources of infection. Occupation of an area of risk may increase the likelihood of exposure, infection and disease among susceptible fish. Disease mitigation in mariculture occurs at 2 scales: area-based (coordinated stocking, harvesting and fallowing) and farm-based (vaccination, early pathogen detection, veterinary prescribed treatments and depopulation or early harvest in the event of viral disease). Collectively, implementation of mitigation measures results in virus disease outbreaks of shorter duration with lower mortality and therefore reduces the likelihood of pathogen transmission. In contrast, the mitigation of sea lice transmission is less likely to be effective in some areas due to the loss of parasite sensitivity to therapeutants and to dissemination of larval lice when parasites occur below management thresholds. For wild populations, risk of pathogen spillback is estimated from farm-based epidemiological data; however, validation, particularly for ISAV and SAV, is required using direct surveillance.

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Effects of host density on furunculosis epidemics determined by the simple SIR model

Cited by 34 publications

References 16 publications

Move or die: change in European catfish (Silurus glanisL.) behaviour caused by oxygen deficiency

Move or die: change in European catfish (Silurus glanisL.) behaviour caused by oxygen deficiency

Marine infectious disease dynamics and outbreak thresholds: contact transmission, pandemic infection, and the potential role of filter feeders

Disease management mitigates risk of pathogen transmission from maricultured salmonids

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