Estimating sea lice infestation pressure on salmon farms: Comparing different methods using multivariate state-space models

Elghafghuf, Adel; Vanderstichel, Raphaël; Hammell, K. Larry; Stryhn, Henrik

doi:10.1016/j.epidem.2020.100394

Cited by 15 publications

(19 citation statements)

References 25 publications

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“…This displacement distance is near the extrapolated 8 km proposed by Nelson et al, (2017) based on approximate mean flow rates of 10 cm/s around sites. This result was similar to previously reported estimates from Norway (Aldrin et al, 2013), Scotland (Amundrud & Murray, 2009;Gillibrand & Willis, 2007;Murray & Gillibrand, 2006) and Grand Manan (Elghafghuf et al, 2020). Other studies estimated larger dispersal distances between 20 and 30 km (Krkošek et al, 2005;Asplin et al, 2011Asplin et al, , 2014Kristoffersen et al, 2013;Salama et al, 2013Salama et al, , 2016Aldrin et al, 2019).…”

Section: Contributions Of Internal and External Infestation Pressuresupporting

confidence: 92%

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Estimating the dispersal of Lepeophtheirus salmonis sea lice within and among Atlantic salmon sites of the Bay of Fundy, New Brunswick

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Stryhn

Hammell

et al. 2021

Journal of Fish Diseases

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The objective of this study was to estimate the impact of infestation pressures on the abundance of the parasitic sea louse, Lepeophtheirus salmonis , in the Bay of Fundy, New Brunswick (NB), Canada, using the Fish‐iTrends database for the years 2009–2018. Infestation pressures were calculated as time‐lagged weighted averages of the abundance of adult female (AF) sea lice within a site (internal infestation pressure: IIP) and among sites (external infestation pressure: EIP). The EIP weights were calculated from seaway distances among sites and a Gaussian kernel density for bandwidths of 5 to 60 km. The EIP with a bandwidth of 10 km had the best fit, as determined with Akaike's information criterion, and historical AF sea lice abundance. This estimated dispersal distance of 10 km was similar to previous studies in Norway, Scotland and in New Brunswick. The infestation pressures estimated from empirical AF sea lice abundance within and among sites significantly increased the abundance of AF sea lice ( p < .001). This study concludes that sea lice burdens within Atlantic salmon farms in the Bay of Fundy, NB, are affected by within site management and could be improved by synchronizing treatments between sites.

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Section: Contributions Of Internal and External Infestation Pressuresupporting

confidence: 92%

“…Elghafghuf et al, 2020), propose data-driven methods for the estimation of infestation pressure. Elghafghuf et al, (2020) evaluated multiple estimation approaches for infestation pressure using Fish-iTrends data from the aquaculture sites in Grand Manan, NB (see Figure 1). Five methods were evaluated using a multivariate autoregressive state-space model.…”

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confidence: 99%

Estimating the dispersal of Lepeophtheirus salmonis sea lice within and among Atlantic salmon sites of the Bay of Fundy, New Brunswick

Parent

Stryhn

Hammell

et al. 2021

Journal of Fish Diseases

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“…Internal infestation pressure (IIP) was assessed based on the fixed lag (FL) approach (Elghafghuf et al, 2020). IIP was calculated on the basis of the mean abundance of adult ovigerous females at time t-l, where l is the lag time.…”

Section: Estimation Of Infestation Pressurementioning

confidence: 99%

“…Extensive research has been dedicated to dynamics of sea louse infestations in salmon (Elghafghuf et al, 2020;Kristoffersen et al, 2014;Nekouei et al, 2018;Rittenhouse et al, 2016;Sandvik et al, 2020;Stien et al, 2005). In sea bass, the seasonal dynamics of L. kroyeri has been studied by Čolak et al (2021), providing important data for the characterization of dynamics of L. kroyeri.…”

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confidence: 99%

Parasitic copepod (Lernanthropus kroyeri) on caged sea bass (Dicentrarchus labrax): An estimation of abundance and internal infestation pressure

Yıldız

Korkmaz

2021

Journal of Fish Diseases

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At the global level, aquaculture provides nearly half of the seafood consumed, and its contribution is thriving. The decline of fishery stocks in nature stimulated the rapid growth of aquaculture to compensate for the seafood demand. However, the intensification of aquaculture has occurred with concomitant disease problems. The parasitological infestations induced by intensive aquaculture conditions have become one of the main challenging factors in the productivity of aquaculture (

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“…These parasitic copepods attach to fish and feed on their mucus and tissue, reducing feed conversion efficiency and causing sores, thereby increasing farming costs and reducing the value of the product. The rate of infestation started from chalimus, pre-adult males and females together with adult males which is believed to be external in origin rather than within a farm [1]. Many pharmaceuticals have been used to control sea lice, typically administered using bath treatments or by addition to feeding.…”

Section: Introductionmentioning

confidence: 99%

Cleaner fish behavioral ecology: Its implications toward wild fishery and salmonid aquaculture sustainability

Upling¹

2020

GSC Adv. Res. Rev.

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Cleaner fish is a keystone species in their natural ecosystem for they have specialized feeding habits that are removing and eating ectoparasites which are colonizing the skin, mouth, and gill cavities of larger fish. Their presence dictates the species distribution, diversity, recruitment, and abundance of different teleost species. They play a very important role in the survival, growth, and welfare of other fishes. They established cleaning stations where a certain location turns into a very rich fishing ground visited by various species of demersal, pelagic including migratory and cartilaginous fishes, that made a stopover and an influx of visiting species that search for it. They formed an interaction known as "cleaning symbiosis" in which cleaners gain nutrition and protection from predators and in return for a cleaning service. Aquaculture, on the other hand, is one of the destructive anthropogenic activities if not well managed. One of the highlighted effluents from aquaculture is the use of pharmaceutical chemical treatments to ease diseases of cultured stocks. Hence, a sustainable and eco-friendly approach to mitigate and eradicate diseases is one of the main concerns of the aquaculturist nowadays. Salmon aquaculture encountered fish louse as one of the most destructive parasites in the industry. However, these parasites have been controlled by a cleaner fish to the extent of suppressing them. These cleaning potentials provide a long-term control of sea louse infestation over a production cycle, provided that cleaner fish are maintain healthy and confined. Thus, the ecological and aquaculture impact of the cleaner fish is being highlighted in this review.

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Estimating sea lice infestation pressure on salmon farms: Comparing different methods using multivariate state-space models

Cited by 15 publications

References 25 publications

Estimating the dispersal of Lepeophtheirus salmonis sea lice within and among Atlantic salmon sites of the Bay of Fundy, New Brunswick

Estimating the dispersal of Lepeophtheirus salmonis sea lice within and among Atlantic salmon sites of the Bay of Fundy, New Brunswick

Parasitic copepod (Lernanthropus kroyeri) on caged sea bass (Dicentrarchus labrax): An estimation of abundance and internal infestation pressure

Cleaner fish behavioral ecology: Its implications toward wild fishery and salmonid aquaculture sustainability

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