Salmon lice control with cleaner fish (lumpfish, wrasse), lice-barrier cage designs ("snorkel", skirts), functional feeds and fallowing — instead of chemical bath and in-feed delousing
Emamectin benzoate (in feed), azamethiphos (organophosphate bath), deltamethrin and cypermethrin (pyrethroid baths), diflubenzuron/teflubenzuron (chitin-synthesis inhibitors in feed); partly hydrogen peroxide baths
Suppliers 1
| AKVA group | Norway | active |
Route into Russia / EAEU EAC
- Regulator
- EAEU accredited bodies / Rosakkreditatsiya
- Typical time
- declaration registered within 3 working days (testing extra); certification longer
- Legal basis
- EAEU technical regulations (TR CU 010/2011, 004/2011, 020/2011); EEC Board Decision No. 41 (20.03.2018) on registering declarations
Information, not legal advice — confirm the procedure for your product.
Proof 4 claims
Chemical delousing (medicinal treatments) using compounds such as emamectin benzoate, pyrethroids, azamethiphos, and hydrogen peroxide.
Use of cleaner fish (lumpfish and wrasse) and barrier cages (e.g., skirts) as biological and non-medicinal control methods.
- Displaced at scale?
- yes
- Caveats
- The evidence indicates that while cleaner fish were adopted at scale, their efficacy in commercial settings is highly variable, often suboptimal, and lacks robust, replicated large-scale experimental validation. Furthermore, their use has recently declined due to welfare concerns, high mortality, and uncertainty regarding their effectiveness.
- Hand review
- D3 National: Norway's chemical sea-lice treatments down 42% while biological (cleaner fish) treatments rose 158% (2012–15 vs 2016–19).
- checked
- 2026-10-06
| The Norwegian salmon industry shifted from chemical to a mix of biological and mechanical methods between 2012 and 2019, with chemical use dropping by 42% and biological treatment (cleaner fish) increasing by 158%. “The average use of chemical, mechanical, and biological treatments changed drastically between the periods 2012–2015 and 2016–2019, with chemical use dropping by 42% and mechanical and biological increasing by 1068% and 158%, respectively (BarentsWatch,2020).” Norway · 2012–2019 · large measured reduction of the old process | peer-reviewed ✓ onlinelibrary.wiley.com |
| The deployment of cleaner fish in Norway increased dramatically from 2009 to 2017, peaking at 60.5 million fish in 2019. “Then from 2009–2017, the use of cleanerfish in Norwegian aquaculture increased dramatically. In 2018, the number decreased somewhat from the previ ous year while they increased and peaked in 2019 at 60,565 (x1000).” Norway · 2019 · large measured reduction of the old process | peer-reviewed journals.plos.org |
| The industry switched to non-medicinal treatments and increased cleaner fish deployment primarily due to the evolution of resistance in salmon lice to chemical treatments. “The industry then largely switched to non-medicinal treatments (Fig 4) and increased the deployment of cleanerfish (Fig 5), resulting in less selec tion pressure of medicinal compounds and a slight increase in sensitivity (Fig 3).” Norway · mid-2010s · | peer-reviewed journals.plos.org |
| Cleaner fish are considered among the next most cost-effective measures for sea lice management in Scotland, following skirts and in-feed medicines. “Cleaner fish, fresh or brackish water baths, the physical removal measures (thermolicer and hydrolicer) and medicinal baths were among the next most cost-effective measures, followed by hydrogen peroxide baths.” Scotland · 2023 · | peer-reviewed www.sciencedirect.com |
References 4
- Aaen SM, Helgesen KO, Bakke MJ, Kaur K, Horsberg TE (2015). Drug resistance in sea lice: a threat to salmonid aquaculture. *Trends in Parasitology* 31: 72–81. VERIFIED DOI · cited by 391
- Imsland AK, Reynolds P, Eliassen G, et al. (2014). The use of lumpfish (*Cyclopterus lumpus* L.) to control sea lice (*Lepeophtheirus salmonis* Krøyer) infestat VERIFIED DOI · cited by 201
- Stien LH, Dempster T, Bui S, et al. (2016). 'Snorkel' sea lice barrier technology reduces sea lice loads on harvest-sized Atlantic salmon with minimal welfare i VERIFIED DOI · cited by 100
- Overton K, Dempster T, Oppedal F, Kristiansen TS, Gismervik K, Stien LH (2019). Salmon lice treatments and salmon mortality in Norwegian aquaculture: a review. VERIFIED DOI · cited by 296
Details
Replaces: chemical delousing baths and in-feed insecticides · Species: salmon · Evidence: medium–high
The chemical problem#
Salmon lice (Lepeophtheirus salmonis, Caligus spp.) are the largest health problem in sea-cage salmon farming, and they also threaten wild salmon and sea trout. Intensive chemical use produced multi-drug resistance in lice (emamectin, pyrethroids, azamethiphos, and even hydrogen peroxide). The chemicals harm non-target crustaceans: pyrethroids and azamethiphos are toxic to lobsters and shrimp near farms, and teflubenzuron and diflubenzuron persist in sediments and disturb moulting crustaceans.
Product overview#
Biological and physical measures, now dominant in Norway:
- Cleaner fish: lumpfish (Cyclopterus lumpus, cold water) and wrasse (ballan Labrus bergylta, goldsinny, corkwing) eat lice off salmon. They are farmed (increasingly hatchery-reared rather than wild-caught). Trials show lumpfish at 4–15 % of salmon numbers significantly reduce lice.
- Barrier cages: “snorkel” cages (salmon kept below the lice-rich surface layer, with a snorkel tube to breathe air) and lice skirts (tarpaulins around the upper cage). Lice larvae concentrate in the upper metres, so these designs cut infestation.
- Functional feeds (plant compounds, immunostimulants): partial effect.
- Coordinated fallowing and synchronized production zones.
- Non-medicinal physical treatments (warm water, freshwater baths, mechanical flushing) are not bioeconomy and have fish welfare problems, so prioritize prevention.
Active ingredient / Composition#
Living cleaner fish (plus shelters and supplementary feed) and physical barriers.
Key facts#
| Parameter | Value |
|---|---|
| Class | Biological control (cleaner fish) + engineering |
| Stocking density | Lumpfish about 5–15 %, wrasse about 5–10 % of salmon numbers (farm protocols) |
| Effect | Snorkel cages: large reductions in lice infestation in trials; cleaner fish: significant lice reduction in trials |
| Residues | None |
Advantages#
- No resistance or chemical toxicity to marine crustaceans.
- Cleaner-fish farming is a new blue-bioeconomy industry (hatcheries in Norway, Scotland, Iceland, the Faroe Islands).
- Barrier cages reduce the number of treatments and stress.
Mode of action#
- Cleaner fish: predation (grazing) on attached lice stages.
- Barrier/depth: avoids the surface layer where infective copepodids gather.
Application#
| Site | Measure | Specifics |
|---|---|---|
| Sea cages | Lumpfish or wrasse from stocking | Welfare is critical: provide shelters (kelp curtains), supplementary feed and health monitoring; high cleaner-fish mortality is a major criticism |
| Sea cages | Snorkel or skirt designs | Check oxygen levels behind skirts |
| Production zone | Synchronized fallowing, lice counting, thresholds | Norway: legal lice limits (0.2–0.5 adult female lice per fish depending on season) |
| Breeding | Lice-resistance selection (moderate heritability) | Long-term |
Limitations#
- Cleaner fish welfare and mortality are serious problems; hatchery supply and proper husbandry are required.
- Lumpfish can carry diseases (e.g. Aeromonas, Pasteurella), so vaccinate them and practise biosecurity.
- No single method is enough; it has to be an integrated program.
Evidence of displacement — D3: proven displacement at scale#
Assessment (hand-reviewed): National: Norway’s chemical sea-lice treatments down 42% while biological (cleaner fish) treatments rose 158% (2012–15 vs 2016–19).
Verified figures (the number is in the quoted sentence and the sentence is on the source page):
- displacement — The Norwegian salmon industry shifted from chemical to a mix of biological and mechanical methods between 2012 and 2019, with chemical use dropping by 42% and biological treatment (cleaner fish) increasing by 158%. (Norway, 2012–2019; peer-reviewed: onlinelibrary.wiley.com)
Suppliers — real products and services (from the vendor index)#
Honest finding: the vendor index has no sea-lice or cleaner-fish supplier. This is recorded as a supplier gap.
Companies below are active vendors in the vendor index whose own card (profile / official website) shows this product or service — matched 2026-10-05 by keyword and checked by hand against the card text. Being listed is not an endorsement; open each card for evidence, contacts and status.
Update 2026-10-05: the new Europe dataset supplies this product — rows marked Europe below. For the other regions the gap noted above still stands unless a row says otherwise.
| Company | Region · Country | What the index shows | Card |
|---|---|---|---|
| AKVA group | Europe · Norway | submerged and lice-separation cage systems that keep salmon away from sea lice | card |
Government funding signals#
Public grants for a specific technology are a leading indicator: governments fund what regulators want to replace and what is close to practical adoption. Searched on 2026-09-27 in: EU CORDIS (FP7, Horizon 2020, Horizon Europe), US federal awards (USAspending: USDA NIFA/ARS/APHIS/Forest Service, EPA, DOE, NOAA, USAID; plus NSF and NIH), UK UKRI Gateway to Research, Australian Research Council. Each grant below was reviewed by hand for relevance. China, Brazil and India are covered in the subsection below (publication-acknowledged grants). Not covered: Russia (RSF, FASIE — not reachable from the research environment) and national agencies outside these databases. Amounts are the funder’s contribution as recorded (US NIH/UKRI: per award or fiscal year).
Signal: Strong. 4 relevant grant(s) · about €10.3M in total · jurisdictions: EU, USA.
| Funder / programme | Project | Lead organisation | Start | Amount | Link |
|---|---|---|---|---|---|
| European Commission — H2020 RIA | ParaFishControl: Advanced Tools and Research Strategies for Parasite Control in European farmed fish | Agencia Estatal Consejo Superior De Investiga (ES) | 2015 | 7,800,000 EUR | link |
| US federal — National Institute of Food and Agriculture | The main objective of the lumpfish project is to address existing lumpfish culture gaps at the hatchery, provide rearing protocols and guidelines… | University Of Maryland, College Park (US) | 2018 | 1,723,276 USD | link |
| US federal — National Oceanic and Atmospheric Administration | Hamlin - an integrated approach to addressing sea lice control in the commercial culture of atlantic salmon | University Of Maine System (US) | 2018 | 725,365 USD | link |
| US federal — National Oceanic and Atmospheric Administration | Lumpfish (cyclopterus lumpus) are used in norway, scotland, and eastern canada as cleaner fish for biological control of parasitic sea lice on farmed… | University Of Maine System (US) | 2022 | 234,487 USD | link |
China, Brazil, India — national research grants acknowledged in publications#
Chinese, Brazilian and Indian funders have no open grant databases reachable here, so this measures scientific papers published since 2015 that acknowledge national government grants, taken from the grant numbers publishers deposit with Crossref. Only papers whose title contains this article’s key terms are counted (a conservative lower bound; “100+” = search window full). It shows research-funding intensity, not budgets. Funders: China — NSFC, National Key R&D Program, China Agriculture Research System; Brazil — CNPq, CAPES, FAPESP, Embrapa, FAPEMIG; India — DBT, DST, ICAR, SERB, CSIR, BIRAC. Rating per country: Strong ≥50 papers · Moderate 10–49 · Weak 1–9.
| Country | Papers funded (2015–2026) | Signal | Main funders (grant acknowledgements) | Example grant → funded paper |
|---|---|---|---|---|
| China | 2 | Weak | NSFC (3) | NSFC 42577319 → Sea lice parasites and salmonids – a hormesis perspective (2025) doi |
| Brazil | 3 | Weak | CNPq (2), CAPES (1) | CNPq 300992/79-ZO → Unusual aggregations of pufferfish at cleaning stations of an estuarine cleaner fish (2023) doi |
| India | 0 | None | – | – |
Scientific evidence#
- Aaen SM, Helgesen KO, Bakke MJ, Kaur K, Horsberg TE (2015). Drug resistance in sea lice: a threat to salmonid aquaculture. Trends in Parasitology 31: 72–81.
- Imsland AK, Reynolds P, Eliassen G, et al. (2014). The use of lumpfish (Cyclopterus lumpus L.) to control sea lice (Lepeophtheirus salmonis Krøyer) infestations in intensively farmed Atlantic salmon (Salmo salar L.). Aquaculture 424–425: 18–23.
- Stien LH, Dempster T, Bui S, et al. (2016). ‘Snorkel’ sea lice barrier technology reduces sea lice loads on harvest-sized Atlantic salmon with minimal welfare impacts. Aquaculture 458: 29–37.
- Overton K, Dempster T, Oppedal F, Kristiansen TS, Gismervik K, Stien LH (2019). Salmon lice treatments and salmon mortality in Norwegian aquaculture: a review. Reviews in Aquaculture 11: 1398–1417.
Bioeconomy value#
Living biocontrol organisms and smart cage design replace neurotoxic and moult-disrupting chemicals in coastal ecosystems.