Our impact

Co-existence with crustaceans

Medical sea lice treatments may potentially impact other crustacean species in the ocean. That is one of the reasons why we try to avoid using it.

Laboratory tests show that sea lice medicines may impact crustaceans if these species come into contact with it. Some medicines may make an impact even in smaller doses. However, it is uncertain whether crustaceans actually do come into contact with sea lice medication after treatment in the ocean, because factors like currents, temperature, and other natural aspects impact how the substances break down. More research to improve our knowledge is underway.

In any case, we are working to avoid using sea lice medicines. Use of such medication has declined significantly in recent years. In line with the precautionary principle, Norway has also prohibited the release of sea lice treatment baths near shrimp fields.

HYDROGEN PEROXIDE TREATMENTS: Amount of active pharmaceutical ingredients (API) used (kg) per tonne of fish produced (LWE). We use preventative methods against sea lice and avoid using hydrogen peroxide whenever possible. We used no hydrogen peroxide in Finnmark in 2019. In Rogaland, it has been used to treat large numbers of fish at the same time, as a targeted and efficient measure to reduce high sea lice levels. In Shetland, hydrogen peroxide has been used to treat amoebic gill disease (AGD), in addition to sea lice treatment. The reduction in hydrogen peroxide usage is a result of a change to freshwater treatments. The use of hydrogen peroxide in BC is similar to the year before. Hydrogen peroxide is made up of water with an extra oxygen molecule. It was previously considered a sea lice treatment that did not impact the environment. At the moment, research is into whether hydrogen peroxide affects other species in the ocean is ongoing. Grieg Seafood is following this research closely.
Amount of active pharmaceutical ingredients (APIs) used (gr) per tonne of fish produced (LWE). Use of bath treatments has decreased in recent years. We also aim to minimize the use of sea lice treatments distributed through feed. We are primarily focusing on preventive solutions like cleaner fish, sea lice skirts, post-smolt transfer. In Rogaland, no medical treatment was used in the period from July to October, as a result of using wrasse effectively. In Shetland, in-bath treatments were replaced by freshwater treatments in 2019, while the use of in-feed treatment has also been reduced as it has been deemed less effective.