Optimal salmon lice treatment threshold and tragedy of the commons in salmon farm networks

Kragesteen, Tróndur Jónsson; Simonsen, Knud; Visser, André W.; Andersen, Ken Haste

doi:10.1016/j.aquaculture.2019.734329

Cited by 26 publications

(12 citation statements)

References 42 publications

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“…Modelling studies are therefore used for connectivity analysis between farms without realistic input data on lice nauplii released from the farms (e.g. Adams et al 2016, Salama et al 2016, Cantrell et al 2018, Kragesteen et al 2019. By establishing open reporting systems for lice observed on farmed fish, and the number of fish per farm (biomass), the management systems can be improved.…”

Section: Discussionmentioning

confidence: 99%

Sampling planktonic salmon lice in Norwegian fjords

Skarðhamar¹,

Fagerli²,

Reigstad³

et al. 2019

Aquacult. Environ. Interact.

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Risk of mortality of wild salmon caused by salmon lice is used as an index for managing aquaculture production in Norway and is based on monitoring of lice attached to wild salmonids and modelled concentrations of lice larvae in fjords. Direct sampling of lice from Norwegian waters to determine concentrations has never been published scientifically and has been considered non-feasible for monitoring purposes. Here we tested 4 different methods for sampling planktonic salmon lice copepodids. Salmon lice were found using all 4 methods with highly variable concentrations related to volume of filtered water with the different methods and patchy and variable distribution of lice within the fjords. Comparison between modelled and sampled lice concentrations showed variability within the same range and aspects of patchiness, and that the modelled concentrations were mostly lower than observed. We conclude that planktonic salmon lice can be sampled in Norwegian fjords with standard zooplankton sampling methods. Development of monitoring programmes of planktonic lice is possible but will demand a large amount of re sources if implemented along the entire coast, because extensive sampling programmes and manpower for analysing samples are required to be able to capture the high spatiotemporal variability and patchy distribution of salmon lice. This calls for further development and use of modelling as a primary tool for national monitoring and management purposes. For further investigations of the effects of infestation pressure on wild salmonids, sampling combined with numerical modelling can provide valuable information.

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Section: Discussionmentioning

confidence: 99%

Sampling planktonic salmon lice in Norwegian fjords

Skarðhamar¹,

Fagerli²,

Reigstad³

et al. 2019

Aquacult. Environ. Interact.

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“…When such resources are to be utilized by many actors who individually maximize their own profits, the outcome may be significantly worse for all parties than if it had been possible to enter into binding cooperation. Both publicly induced cooperation, where a regulator mandate cooperation and sanction noncompliance, and private collaboration arrangements are seen as solutions to what is often referred to as "the tragedy of the commons" (Kragesteen et al, 2019). Collaboration is often defined as relationships that develop between two or more formally independent organizations as a result of a mutual agreement on the future exchange of resources, joint activities or joint decision-making.…”

Section: Theorymentioning

confidence: 99%

Shared waters—shared problems: The role of self-governance in managing common pool resources

Osmundsen

Karlsen

Robertsen

et al. 2020

Aquaculture Economics & Management

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“…Sea lice has a direct private cost for farmers (such as increased mortality and regulatory imposed treatment costs), but also a social cost by adversely affecting the health of wild fish stocks, as well as cross farm location contagion (Krkošek et al 2005(Krkošek et al , 2007Torrissen et al 2013). Number of fish at farm locations raises the abundance of sea lice and the rate of spread of lice between farms (Kragesteen et al 2019;Jansen et al 2012). As such, private stocking decisions are related to both private and social costs of sea lice abundance.…”

Section: Introductionmentioning

confidence: 99%

“…Aldrin et al (2013) document that 66% of the expected salmon lice abundance at a location was attributed to infections within farms, 28% was attributed to infection from neighboring farms, and 6% to non-specified sources of infection. In addition, the number of fish at a farm location raises abundance of sea lice and the rate of spread between farms (Kragesteen et al 2019;Jansen et al 2012). As such, private stocking decisions are related to social costs of sea lice.…”

Section: Introductionmentioning

confidence: 99%

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Implications of Entry Restrictions to Address Externalities in Aquaculture: The Case of Salmon Aquaculture

Øglend

Soini

2020

Environ Resource Econ

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This paper investigates production license management when regulation constrains the number of production licenses to address production externalities. This is increasingly relevant for aquaculture production where disease issues threaten future seafood supply. The regulatory problem is analyzed in the context of Norwegian salmon aquaculture where a stop in issuance of new production licenses has been implemented to address social costs of parasitic sea lice. Our theoretical model shows that restricting number of licenses raises prices and shifts production efforts excessively towards greater stocking of fish per license. Hence, the policy cannot achieve a first-best welfare-maximizing allocation. Furthermore, restricting entry by limiting number of licenses can create regulatory rents, which effectively subsides rather than tax the source of the externality.

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Optimal salmon lice treatment threshold and tragedy of the commons in salmon farm networks

Cited by 26 publications

References 42 publications

Sampling planktonic salmon lice in Norwegian fjords

Sampling planktonic salmon lice in Norwegian fjords

Shared waters—shared problems: The role of self-governance in managing common pool resources

Implications of Entry Restrictions to Address Externalities in Aquaculture: The Case of Salmon Aquaculture

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