Farm size as a factor in hydrodynamic transmission of pathogens in aquaculture fish production

Salama, N. K. G.; Murray, Alexander G.

doi:10.3354/aei00030

Cited by 81 publications

(64 citation statements)

References 51 publications

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“…First, stocking density is reported to affect stress levels of tilapia (El-Sayed 2002). Second, larger farms are characterized by close proximity to greater numbers of fish, which may lead to greater potential for exposure to pathogens and disease (Salama & Murray 2011). Perhaps relative to other circumstances, differences between farms were too small to affect overall PM.…”

Section: Associations Between 'Overall Pm' and Predictorsmentioning

confidence: 99%

Production of red tilapia (Oreochromis spp.) in floating cages in the Mekong Delta, Vietnam: mortality and health management

Boerlage¹,

Dung²,

Hoa³

et al. 2017

Dis. Aquat. Org.

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The Mekong Delta in Vietnam is one of the most productive aquaculture regions in the world, in which the red tilapia (Oreochromis spp.) industry is a small-scale industry that mainly supplies local markets in the delta region. Little is known about the frequency of mortality events and health management in this sector. We describe red tilapia floating cage production systems in the Mekong Delta, Vietnam, for the purposes of quantifying mortality and associated production factors, and describing practices that may influence pathogen introduction and spread to and from farms. In July 2014, approximately 50 red tilapia farmers from 4 provinces (201 farmers in total) were randomly selected and interviewed. Median overall perceived mortality (PM) within a production cycle was 35%. Overall PM was found to be affected by province (p < 0.01), age of farmers (p = 0.01), anticipated main reason for PM in the first 2 wk (p = 0.03), most common market for the fish (p = 0.02), and whether farmers recorded stocking information (p = 0.01). Based on the interviews, we describe and discuss processes that potentially affect pathogen introduction and spread on these farms, such as movements of live and dead fish, distances between farms, mechanical transmission, and biosecurity practices such as treating fish before stocking, using disinfectants, and sharing equipment, and harvesters' movements. This study provides fundamental understanding of red tilapia aquaculture management in the Mekong Delta, and describes management factors that could become important in the event of disease outbreaks.

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Section: Associations Between 'Overall Pm' and Predictorsmentioning

confidence: 99%

Production of red tilapia (Oreochromis spp.) in floating cages in the Mekong Delta, Vietnam: mortality and health management

Boerlage¹,

Dung²,

Hoa³

et al. 2017

Dis. Aquat. Org.

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“…In aquaculture species, numerous diseases have emerged through pathogen exchange with wild populations, evolution of pathogenic from nonpathogenic microorganisms and anthropogenic transfer of stocks (Murray & Peeler 2005, Peeler & Taylor 2011. Characteristics of the aquaculture environment, such as hydrodynamic connectivity, mixing of waters and close proximity, exacerbate disease epidemics (McCallum et al 2004, Gustafson et al 2007, Viljugrein et al 2009, Salama & Murray 2011.…”

Section: Introductionmentioning

confidence: 99%

Mass mortalities of Pacific oysters Crassostrea gigas reflect infectious diseases and vary with farming practices in the Mediterranean Thau lagoon, France

Pernet¹,

Barret²,

Gall³

et al. 2012

Aquacult. Environ. Interact.

194

250

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“…However, treating cages at different times could result in an implicit use. Both variations could occur on salmon farms depending upon the hydrodynamics of the site [35]. 4.…”

Section: Methods: Scenariosmentioning

confidence: 99%

Managing aquatic parasites for reduced drug resistance: lessons from the land

McEwan

Groner²,

Burnett

et al. 2016

J. R. Soc. Interface.

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Atlantic salmon farming is one of the largest aquaculture industries in the world. A major problem in salmon farms is the sea louse ectoparasite Lepeophtheirus salmonis, which can cause stress, secondary infection and sometimes mortality in the salmon host. Sea lice have substantial impacts on farm economics and potentially nearby wild salmonid populations. The most common method of controlling sea louse infestations is application of chemicals. However, most farming regions worldwide have observed resistance to the small set of treatment chemicals that are available. Despite this, there has been little investigation of treatment strategies for managing resistance in aquaculture. In this article, we compare four archetypical treatment strategies inspired by agriculture, where the topic has a rich history of study, and add a fifth strategy common in aquaculture. We use an agentbased model (ABM) to simulate these strategies and their varying applications of chemicals over time and space. We analyse the ABM output to compare how the strategies perform in controlling louse abundance, number of treatments required and levels of resistance in the sea louse population. Our results indicated that among the approaches considered applying chemicals in combination was the most effective over the long term.

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Farm size as a factor in hydrodynamic transmission of pathogens in aquaculture fish production

Cited by 81 publications

References 51 publications

Production of red tilapia (Oreochromis spp.) in floating cages in the Mekong Delta, Vietnam: mortality and health management

Production of red tilapia (Oreochromis spp.) in floating cages in the Mekong Delta, Vietnam: mortality and health management

Mass mortalities of Pacific oysters Crassostrea gigas reflect infectious diseases and vary with farming practices in the Mediterranean Thau lagoon, France

Managing aquatic parasites for reduced drug resistance: lessons from the land

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