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Gro.Refseth@akvaplan.niva.no
Akvaplan-niva AS

Year: 2019
Project manager: Gro Harlaug Refseth
Project code: 782018

The use of delousing agents (chemicals used to kill lice in farmed fish) in the aquaculture industry is currently high. This project addresses potential effects of delousing agents on the surrounding environment. Releases of these pesticides from fish farms may affect non-target species in the surrounding habitat, such as Pandalus borealis, an ecologically and economically important species in Northern Norway. We will assess sensitivity of P. borealis to azametiphos, a delousing agent, in laboratory experiments. We will also measure environmental concentrations of azametiphos near fish farms, based on passive sampling techniques developed as part of the 2017 incentive funds «ToolSalmon» project. Ecotoxicological metrics (e.g threshold value for effect) for use in risk assessments will be obtained from laboratory studies and literature review. Results will be compared to measured field concentrations. In addition, we will perform a literature review on mode of action of the different delousing agents to elucidate if usage of these pesticides can be associated to observations of mass death of marine crustaceans and possible food-chain related effects. This project will generate and disseminate critical new knowledge of the potential impact of salmon fish farming on the surrounding marine environment that is essential for decision-makers to balance multi-sectoral interests in coastal zone resources (IMR, 2016). Within this context, the project contributes to the aim of balancing costal ecosystem health and resource utilization.

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