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Farming fish entails responsibility for ensuring that the fish have the best possible conditions. The challenge is to provide for the best possible way to protect and ensure fish health and welfare. The most significant challenges in recent years have been injuries from sea lice treatments, Cardiomyopathy syndrome, bacterial diseases and gill disease.
If Lerøy's operations are not sound, this could affect our fish's welfare and species diversity directly. In the extreme, this could give our company financial fines, reduced income and lack of capital as well as lost reputation. Without proper management, there will also be a risk of affecting species diversity in Norwegian rivers where wild salmon spawn, as well as welfare challenges for fish in aquaculture. If we use antibiotics irresponsibly, there could be a risk of intolerance to antibiotics for the people who handle these substances without proper training.
We want the fish in our cages to thrive and aim to protect them as much as possible against unnecessary impact and stress. We care about our fish, and willingly accept the ethical responsibilities inherent in farming fish. Our ambitions are also to make use of procedures to standardise the processes to which the fish are subjected, and to update and implement these as soon as we gain new knowledge. As such, the entire organisation has rapid and efficient access to new knowledge.
The key objective regarding fish health is to make sure that as many fish survive until slaughter.
Measures to improve fish health include:
The Group are working to fulfil the 5 aspects of animal welfare, commonly known as the “Five Freedoms”, for all our fish.
Our fish welfare initiatives are comprehensive and cover every part of our farming value chain.
Mandatory fish welfare training for all staff comprise legislation, animal welfare, fish health biology, stress, sedation and euthanasia. Other topics covered are natural behaviour, environmental requirements, water quality and physiology. Based on this knowledge, staff are also trained in internal fish handling protocols and policies.
Welfare indicators are used throughout the production cycle. At harvest stations, welfare indicators are used to monitor the fish prior to, and after stunning and bleeding. All our harvest stations use either electrical or percussive stunning for anaesthesia. This procedure is then followed by bleeding the fish. Bleeding is performed either manually or robotic. Indicators such as eye reflex and operculum movements are monitored and recorded daily. The effect of anaesthesia and bleeding is monitored, and in case of insufficient effect, a reserve system is used.
In case of loss of power, an emergency power supply will help evacuating the fish from the rig.
In case of the need to euthanize fish on the farming site, the fish is anaesthetized with an approved anaesthetic or by percussion followed by bleeding out. Farm personnel are trained in fish welfare at least every 5 years. In addition, they are guided by fish health professionals, who visit the farm at least monthly.
During transportation of fish in well boats, there is implemented a risk-based water quality monitoring and control program. This continuous monitoring includes parameters such as temperature, dissolved oxygen and pH. Limit values are set according to duration of transport, density in tanks and size of the fish.
During recent years, increased use of camera technology in our pens has given us the ability to monitor a range of observable welfare metrics on a daily basis. The metrics are based on the Fishwell standard, and include scores on skin health, deformities, fin damages, eye status and maturation.
Throughout the year, we have meetings, email correspondence and conversations with various stakeholders where we have presentations and discussions related to the areas where we have or can have a potential impact. We also attend conferences and meetings where we meet and discuss. Through this form of dialogue, we gain insight into what stakeholders are concerned with and feedback on what they think about the way we work, measures we have initiated and what they think we should focus on going forward. Through various forms of benchmark surveys, we also receive feedback on what stakeholders think about our measures and their implementation. The Group strive to minimize handling operations of live fish. As little handling as possible improves fish health and welfare, which is an important objective for the Group.
We use procedures as management tools for our production. The procedures help us to standardize events at each life stage, and they are updated as soon as we gain new knowledge regarding fish welfare. In this way, the entire organization acquires the new knowledge quickly and efficiently.
Pumps, transportation pipes, sorting equipment and vaccination equipment are checked at regular intervals and any damage or defects are repaired before use.
During major operations such as vaccination and sorting, the fish is checked for any damage at regular intervals to detect any defects of equipment.
All components used during sea transfer are checked regularly. If situations arise where an increased incidence of mechanically inflicted damage is registered, delivery is stopped until the cause of the damage has been investigated and corrected.
During sea transfer, dead fish are controlled for mechanical damage that may have been inflicted during transport. If it turns out that there is presence of mechanically inflicted wounds, a thorough review of the delivery process will be taken.
When fish are crowded during various forms of handling, we have our own handling procedures describing how this is to be carried out to ensure fish welfare.
In all non-medical lice treatments, welfare screening of the fish is performed before and after treatment. In this way, we have documentation of the impacts for the fish, and whether measures may need to be taken to reduce negative consequences.
Zone Cooperation 100%
All of our on-growing sites take part in a zone-based cooperation with other farmers. In all regions where the Group has operations, fallowing, washing/disinfection and restocking are coordinated in zones every second year. This cooperation also involves coordination of operations, collaboration relating to lice, disease management and other issues where the solution to the problem requires a joint, coordinated effort.
Disease management is of essential importance for all animal farming. Within the Group, disease management is based on a preventive operational practice, where the primary goal is to prevent problems before they occur.
Our work on disease management is based on recognized principles. These are in turn based on biological know-how and attitudes, in which training for our employees and a live internal control system lay the foundations for operations.
Disease prevention and management are monitored by fish health professionals (authorized animal health personnel), who also play key roles related to Lerøy's continuous learning and development of best operational practice.
We aim to farm fish under production conditions that safeguard the biological requirements of all species. Density and water quality parameters, such as temperature, salinity and oxygen shall be adapted to the requirements for fish at different life stages. We operate a specific vaccination program and vaccinate all our farmed fish before sea transfer.
The main target for fish health and welfare is to increase fish survival rates throughout the production value chain. All employees involved in handling live fish undergo training focusing on fish welfare.
Fish welfare is developed and monitored by keeping use of medicines to a minimum, with careful assessment of use, using only approved medicines which have documented environmental impact in accordance with the requirements of The Norwegian Medicines Agency, monitoring and documenting tolerance, and following up biological feed factors if administered by feed.
Medication is used only when this is deemed appropriate and necessary.
We exclusively make use of licensed products, and all medicine prescriptions are issued by authorized animal health personnel. Lerøy Seafood Group currently employs over 20 fish health professionals (authorized animal health personnel).
Policy: Use of medication
The company is supplied with self-produced lumpfish. This ensures predictability for deliveries and enables us to control targeted improvement measures, aiming to ensure predictability and biological improvements within the production.
In some regions, The Group also make use of wild-caught wrasse species. Fishing quotas of wild-caught wrasse species are regulated by the Norwegian Directorate of Fisheries. The Norwegian Institute of Marine Research (IMR) states that fisheries of wild-caught wrasse species are sustainable.
Welfare for cleaner fish has been debated, and we acknowledge that there are challenges involved in the use of cleaner fish in salmon farming. However, we experience that our targeted measures listed further down are moving us in the right direction regarding health and welfare of the cleaner fish.
Our onshore production facilities for cleaner fish have over the years implemented measures within operations and biosafety, providing significant improvements to both health and welfare.
These measures encompass a wide range and comprise of:
After vaccination and immunization in onshore production facilities, the farmed cleaner fish are transferred to the salmon farming sites at sea. Here they perform their function by eating sea lice. In the pens at sea, cleaner fish are provided with artificial kelp for resting, and they are supplied with customized feed on a daily basis. Despite, we experience mortalities above expected levels at times. The causes of terminal losses during the sea water phase are dominated by bacterial diseases.
Measures to improve health and welfare are:
Over the years, we have participated in several collaborative projects with research institutes aimed at improving health and welfare of cleaner fish
When the salmon is harvested, remining cleaner fish are anesthetized and euthanized either at the site or at the harvest station.
Policy: Cleaner fish
On a daily basis, all facilities electronically register the number of dead fish and the likely cause of death. Dead fish are collected and delivered for silage, which in turn is included in animal feed for other species.
We calculate a fish welfare score before and after treatment for all non-medicinal delousing. This provides us with documentation of the scope of the impact, and whether we have to take action to reduce the negative consequences.
When using de-lice agents and other drugs, there are strict routines for how these should be handled. Personnel who will handle the funds have received training in how to handle the substances.
The fish are monitored throughout every part of the slaughter process by personnel who have received the obligatory training in fish welfare. All fish are anaesthetised before slaughter, either by electric shock or a blow to the head. The system and method for slaughter require the follow-up of the Norwegian Food Safety Authority. Every day before starting slaughter procedures, the fish are checked and logged to verify a sufficient level of anaesthetisation.
Target 2023: Survival in sea, last 12 months according to GSI: 94,5%
Result 2022: 92,5 %
This is mainly due to challenges involving stress and injury of treatment/handling, bacterial and viral disease and wounds.
The Group have many ongoing projects and initiatives aiming to improve health and welfare of our fish, and thus increasing survival rates. Examples of recent measures implemented to reduce mortality:
We make use of procedures as governance tools for production. These procedures help us standardise the processes to which the fish are subjected, and they are updated as soon as we obtain new knowledge that has to be taken into account. As such, the entire organisation has rapid and efficient access to new knowledge.
R&D Projects Within Fish Welfare and Farming
The group participates in many different research projects in order to be at the forefront in terms of the best possible fish health and to implement new technology and expertise as soon as possible.
The various projects can be roughly divided into 3 different areas:
Most of our ongoing projects fall into one of these groups.
A number of projects have been implemented to improve fish health and fish welfare. These include:
The Group aims to improve the health and welfare of our fish. Ensuring good health and welfare is first and foremost an ethical responsibility, however reduced health and welfare can also negatively impact our biological and economic results. In order to ensure good health and welfare, the Group actively work to make sure that the fish thrive, grow and survive.
Improved fish health is monitored by number of disease outbreaks and survival rates.
The Group strive to minimize handling operations of live fish. As little handling as possible improves fish health and welfare , which is an important objective for the Group.
We use procedures as management tools for our production. The procedures help us to standardize events at each life stage, and they are updated as soon as we gain new crucial knowledge regarding fish welfare. In this way, the entire organization acquires the new knowledge quickly and efficiently.
Smolt:
Pumps, transportation pipes, sorting equipment and vaccination equipment are checked at regular intervals and any damage or defects are repaired before use.
During major operations such as vaccination and sorting, the fish is checked for any damage at regular intervals to detect any defects of equipment.
All components used during sea transfer are checked regularly. If situations arise where an increased incidence of mechanically inflicted damage is registered, delivery is stopped until the cause of the damage has been investigated and corrected.
Ongrowing stages:
During sea transfer, dead fish are controlled for mechanical damage that may have been inflicted in connection with the transport. If it turns out that there is presence of mechanically inflicted wounds, a review of the delivery process will be taken.
When fish are crowded during various forms of handling, we have our own handling policies describing how this is to be carried out to ensure fish welfare.
In all non-medical lice treatments, welfare screening of the fish is performed before and after it has been treated. In this way, we have documentation of the impacts for the fish, and whether measures may need to be taken to reduce the negative consequences or not.
The company produces around 10 million Lump sucker per year. This implies a high ratio of self-supply, which in turn ensures predictability for deliveries and enables us to control targeted improvement measures, aiming to ensure predictability and biological improvements for production.
Welfare for cleaner fish has been debated for some time, and we acknowledge the challenges involved in farming cleaner fish. At the same time, we are aware that our measures are moving us in the right direction, biologically.
Our onshore production facilities have implemented improvement measures within operations and biosafety, providing significant improvements to biology and cleaner fish welfare.
These measures encompass a wide range and comprise of:
After transfer to salmon production sites, when the cleaner fish perform their function by eating salmon lice, we continue to experience challenges. The causes of terminal losses are dominated by bacterial disease.
Measures to improve welfare are:
Additional, we aim to not use more cleanerfish than necessary for lice management.
We provide a (at least) monthly health assessment, performed by authorised animal health personnel. Cleaner fish in the harvest stations are anesthezised and euthanized.
ZONE COOPERATION 100%
All of our on-growing sites take part in a zone - based cooperation with other farmers. In all regions where the Group has operations, fallowing, washing/disinfection and restocking are coordinated in zones every second year. This cooperation also involves coordination of operations, collaboration relating to lice, disease management and other issues where the solution to the problem requires a joint, coordinated effort.
The group participates in many different research projects in order to be at the forefront in terms of the best possible fish health and to implement new technology and expertise as soon as possible.
The various projects can be roughly divided into 3 different areas:
Most of our ongoing projects will fall into one of these groups.
Examples: Oxygenation in seacages, Feeding and cardiomyopathi syndrome, Wounds in smolts, Vaccine trials, Fish welfare indicators and thecnologicel measurment, Bacterial wounds in salmon ongrowing, Wounds in postsmolts, Sceletal deformities in trout, Health and growth in smolts.
Disease management is of essential importance for all animal farming. Within the Group, disease management is based on a preventive operational practice, where the primary goal is to prevent problems before they occur.
Our work on disease management is based on recognized principles. These are in turn based on biological know-how and attitudes, in which training for our employees and a live internal control system lay the foundations for operations.
Disease prevention and management are monitored by fish health professionals (authorized animal health personnel), who also play key roles related to Lerøy's continuous learning and development of best operational practice.
We aim to farm fish under production conditions that safeguard the biological requirements of all species. Density and water quality parameters, such as temperature, salinity and oxygen shall be adapted to the requirements for fish at different life stages. We operate a specific vaccination program and vaccinate all our farmed fish before sea transfer.
The main target for fish health and welfare is to increase fish survival rates throughout the production value chain. Salmon mortality rates due to viral diseases has decresed by 19,4% during the last two years. All employees involved in handling live fish undergo training focusing on fish welfare.
Fish welfare is developed and monitored by keeping use of medicines to a minimum, with careful assessment of use, using only approved medicines which have documented environmental impact in accordance with the requirements of The Norwegian Medicines Agency, monitoring and documenting tolerance, and following up biological feed factors.
Medication is used only when this is deemed appropriate and necessary.
We exclusively make use of licensed products, and all medicine prescriptions are issued by authorized animal health personnel. Lerøy Seafood Group currently employes 20-30 fish health professionals (authorized animal health personnel).
Chemical used in delousing, active agents (kg) per ton gross weight
| Year | Via feed (kg) | Via bath (kg) | Hydrogen peroxide* (kg) |
| 2022 | 0,000026 | 0,004 | 0,00 |
| 2021 | 0.000062 | 0.014 | 8.72 |
| 2020 | 0.0001 | 0.00012 | 5.3 |
| 2019 | 0.000149 | 0.000030 | 2.5 |
| 2018 | 0.000023 | 0.000003 | 6.11 |
| 2017 | 0.000162 | 0.000076 | 1.83 |
| 2016 | 0.00160 | 0.000547 | 18.40 |
| 2015 | 0.00132 | 0.001361 | 50.45 |
| 2014 | 0.002474 | 0.003034 | 40.87 |
| 2013 | 0.00006 | 0.002321 | 4.35 |
Excessive use of antibiotics can result in antibiotic resistance in some areas, a major risk factor for health and for fighting diseases, particularly for humans.
In general, food production from animals require the use of medicines to treat diseases, not least with a view to animal welfare. If not controlled, the use of antibiotics and other medicines in conventional fish farms could contribute to an undesired and negative affect on humans and the environment.
If disease is detected on our fish and if the fish must be given antibiotics for fish welfare reasons, this will also lead to an increased risk of fish mortality as well as increased costs for Lerøy. The use of antibiotics, on the instructions of Lerøy`s fish health personnel, will have very little risk of causing any kind of damage to the environment. Without proper training and protective equipment, the use of antibiotics can ultimately cause intolerance in personnel who handle antibiotics. Note that the volumes that Lerøy has used during the 15 last years are extremely low.
Lerøy Seafood Group avoids unnecessary use of all antibiotics, including MIAs, CIAs and HPCIAs and veterinary antibiotics, in production of all fish for consumption. We aim to achieve this goal via organization-wide measures involving disease management, including preventive operational practice, 100 % vaccination, early diagnosis and appropriate measures to handle outbreaks.
The use of antibiotics is close to zero in the Norwegian fish farming industry. Lerøy Seafood Group applies a very restrictive policy when it comes to use of antibiotics, and use is only on exception and to safeguard fish health. Antibiotics are seen as the last resort, only applied in situations where use has been assessed by veterinarians as necessary to handle a confirmed disease-related situation. The Group´s policy on use of antibiotics is compliant with WHO (World Health Organization) guidelines on use of Medically Important Antimicrobials in food producing animals and the WHO list of Critically Important Antimicrobials for Human Medicine.
The Group has specifications for special brands saying that there is not used any kind of antibiotics during the production time. These brands are certified by a 3rd party.
All medicines used must be prescribed by authorised fish health personnel. Before starting medication, a risk analysis is carried out to assess measures not involving medicines, and the impact on any vulnerable habitats and species close to the facility.
Risk assessment and measures are in place to prevent any risk of employees developing antibiotic resistance.
All use of medicines is logged in our own production management system. Details such as the name of the person who prescribed the medicine, approved assistant, active substances, quantity, treatment period and retention period for the fish are all registered each time treatment is administered.
Environmental surveys are conducted at least once a year in the zone surrounding each facility. These surveys are conducted by an independent company. The analyses are in three parts: fauna, chemical and sensory. The analyses result in a score from 1 to 4, where 1 is the best result. If the score is 3 or 4, action must be taken to improve conditions at the facility. Similar and more extensive surveys are conducted outside the immediate surroundings at least every five years.
Target 2023: Annual use of antibiotics in the Group: 0 kg
|
Annual use of antibiotics in the group |
Comment |
|
|
2023 (Target) |
0 kg |
- |
|
2022 |
0 kg |
- |
|
2021 |
0 kg |
- |
|
2020 |
18,99 kg |
*See result 2020 |
|
2019 |
0 kg |
- |
*Result 2020: 18,99 kg One treatment with 18.99 kilo total, which is 0,08mg Florfenikol/kg produced fish. This was treatment administered to small, newly released fish, for a bacterial infection, Tenacibaculum sp. and Moritella viscosa.
Lerøy avoids unnecessary use of antimicrobial agents. To achieve this, a number of different preventive measures are implemented and are part of a preventive operating practice including vaccination, risk management, disease control, structural measures, early diagnoses etc. A number of preventive projects have been initiated to prevent future use of antibiotics. These include:
Tenacibaculum spp. as the cause of atypical winter wounds on Norwegian farmed salmon – Norwegian Seafood Research Fund (FHF) project:
https://www.fhf.no/prosjekter/prosjektbasen/901434 Project period: 01.10.2017-30.09.2021. The aim of the project is to identify risk factors for the outbreak of Tenacibaculosis and to characterise toxin production in Tenacibaculosis spp. The project also aims to test “proof of principle” for the use of toxins as antigens in vaccines.
Limit the effect of tenacibaculosis in Norwegian fish farming (LimiT) – Norwegian Seafood Research Fund (FHF) project: https://www.fhf.no/prosjekter/prosjektbasen/901433/ Start/finish: 10.10.2017 – 15.12.2020. The goal with this project has been to gain a better understanding of how a disease or illness progresses, and to identify virulence factors in the bacteria. Trials involving infection have shown that the skin on smolt that have been kept in waters with lower salinity (26 per thousand) than normal sea water prior to release to sea may be better able to combat infection. Comparisons over time in the infection model demonstrate that the skin is in significant development, and that this most likely affects the outcome of the infection. This implies e.g., that the outcome of exposure to skin pathogens will largely be affected by the post-smolt phase of the skin. The results indicate that the industry may be able to reduce the consequences of tenacibaculosis by exposing the smolt to lower salinities during a period prior to release to sea.
FHF 901835 Best practice measures to prevent winter ulcers: aims to identify best practice for handling and mapping wound risk related to handling.
Lerøy internal wound projects: Different projects that aims to reduce prevalence of bacterial wound-infections. In 2020, a project was implemented to identify risk factors for wound development on large fish and fish recently released to sea.
Vaccine trials: To contribute to development of new/more effective vaccines.
Salmon and trout farming entails a relatively higher level of host density compared to in the wild. Infection pressure of wild salmon stocks with sea lice from farmed salmon is one of the main challenges in terms of environmentally sustainable aquaculture.
Due to the host density in farming, Lerøy attempts to keep average numbers of mature female sea lice as low as possible throughout production. Controlling sea lice levels entails higher costs and have the highest priority in Lerøy.
Salmon lice live naturally in the sea and will be able to use our fish in aquaculture as host animals. It is important for Lerøy that we monitor the level of lice in the sea and on fish when the fish is under production. Undesirable quantities of lice will increase the risk that possibly escaped fish from our farms, and smolts that are migrating from the river and passes our farms to the sea, may be attacked by lice. If the lice surcharge becomes too high on our fish, it may exceed the limit values in Norwegian regulations and lead to increased costs for the company, fines, downgrading of fish, reduced fish welfare and, in worse case, fish mortality. Lice infestation on wild smolt could have a negative impact on this species.
The Group´s efforts to control salmon lice follow the principles of an IPM strategy to control salmon lice and keep the numbers at a low level in the long term. The overall goal is to reduce any negative impact on the environment and the need for active interventions.
The overall principles underlying this control strategy includes establishing acceptable levels (see details in Policy), preventive measures (as structural measures relating to use of locality, coordinated operations over larger geographical areas, zone collaboration, fallow periods in between production cycles, smolt quality and smolt weight as measures to reduce period of exposure, use of various types of physical barriers, (e.g. skirts), monitoring, biological control (i.e. cleaner fish) and active interventions.
We work to minimize levels of adult female lice per fish as close to zero as possible.
We use targeted measures to reduce the number of lice by reducing exposure in the sea. To do so, we produce larger smolt using RAS technology so we can have shorter production periods in the sea. Biological delousing using our own produced cleaner fish is also a target area for Lerøy.
Since 2010, Lerøy Seafood Group ASA (LSG) has developed technology for semi-closed facilities. This technology takes water from depths of 20-30 metres and transports this via a laminar flow in a tube. Water from these depths helps reduce infection exposure for the fish in the facility as the majority of lice larvae are found in the upper water layers, down to depths of 10 metres.
Requirements from the authorities provide a definition, at any given time, of the upper maximum limit for fully grown female lice. Lerøy has also established their own limit values to provide guidelines for when to implement preventive and active measures to control sea lice levels.
The average values for lice in the facilities shall be reduced by more than 50% during the period from April to June when compared with the rest of the year. This is when wild salmon migrate as smolt from the rivers to the oceans.
Sea lice counts and registration are carried out at a minimum of every seven days for all cages in each facility. This is either done manually by catching the fish in a landing net or automatically by underwater camera technology. If done manually, the fish are anaesthetised in tanks and controlled individually. A representative selection of fish is taken from each cage. Lice are counted in the following categories in terms of stages:
1) Adult female (with and without egg strings)
2) Mobile pre-adults (including adult males)
3) Attached juveniles
An average figure is calculated by totalling the number of all lice from all fish (plus lice in the tank for counting) and dividing this number by the total number of fish studied. The weighted average for the farm is calculated based on sea lice counts and the number of fish in each pen.
Infestation of wild fish by lice from Norwegian fish farms is calculated regionally by the Institute of Marine Research, by counting lice on wild salmon and using modelling. To read the Institute's report for 2023, use the following link: Lakselus – risikovurdering og kunnskapsstatus 2023 | Havforskningsinstituttet (hi.no).
Target 2023:
Limits for levels of adult female lice per fish set by the authorities varies throughout the year and differ depending on region. This is described in detail in the Group´s Policy for control of sea lice.
Norwegian regulations require that the average number of adult female lice per fish per farm must be below the maximum limit of 0,5 at any time. In addition, during spring where smolts typically migrate from the rivers to the ocean, the average number of female lice per fish per farm must be below 0,2.
This period is defined as:
Week 16 up to and including week 21 in Trøndelag County and further south.
Week 21 up to and including week 26 in Nordland County and further north.
Average number of adult female lice per fish per region was in 2023: Lerøy Sjøtroll: 0,22 , Lerøy Midt: 0,20 and Lerøy Aurora: 0,08.
| 2022 | 2021 | 2020 | 2019 | |
| Average number of adult female lice per fish | 0,18 | 0,18 | 0,16 | 0,15 |
| 2022 | 2021 | 2020 | 2019 | |
| Number of sites in compliance with sea lice limits at any given time | 99,1 % | 98,2 % | 98,0 % | 98,3 % |
| 2022 | 2021 | 2020 | 2019 | |
| Number of cages treated for lice ( number) | 1 853 | 1 576 | 1 428 | 830 |
| 2022 | 2021 | 2020 | 2019 | |
| Volume of delousing agents used via bath (kg active substance) | ||||
| Alphamax | 1,42 | 0,83 | 0,64 | 0,18 |
| Azasure | 0 | 16,8 | 20,78 | 5,39 |
| Salmosan | 44,5 | 103,4 | 6,3 | 0,75 |
| Ectosan | 1 507 | 3 050 | ||
| Hydrogenperoxide | 0 | 1 728 720 | 1 243 608 | 532 982 |
| Volume of delousing agents via feed (kg active substance) | ||||
| Slice | 8,27 | 14,08 | 23,3 | 30,4 |
Lerøy’s efforts to control salmon sea lice shall continue to follow the principles of an IPM strategy to control salmon sea lice and keep the numbers at a low level in the long term. The goal is to reduce the negative impact on the environment and the need for active interventions. Below is a description of the overall principles underlying this control strategy.
Preventive measures: Prevention is the first line of defence, aiming to control the levels of salmon sea lice by making use of passive control mechanisms. The methods utilised depend on local prerequisites and entail use of one or more of the following measures: Structural measures relating to use of locality, zone collaboration, fallow periods in between production cycles, post smolt strategy and different types of physical barriers.
Biological control: cleaner fish represent a method for treatment prevention, and the goal is to reduce the need for active measures.
Non-medicinal methods: These methods are based on different types of measures that do not include the use of medicines. Lerøy makes use of methods within the categories for fresh water, flushing and temperate water.
Medicinal methods: These methods are based on the use of medicines. In cases where medicines are utilised, these shall be 1) prescribed by authorised fish health personnel and 2) evaluated with regards to the risk for fish welfare, food safety, environment and resistance, and 3) where only medicines approved by Norwegian medicines authorities can be used.
Policy: Control of salmon lice
It is an essential goal for us to keep the survival rates as high as possible.
Lost fish is undesirable both from a fish health and welfare perspective and from a financial perspective. Thus, our goal is to get as many individuals as possible throughout the whole production phase from egg to slaughter. Farming robust smolts, good husbandry, disease control and careful handling are key factors.
2023: Survival in sea, last 12 months according to GSI: 94.5%
|
2022 |
2021 |
2020 |
2019 |
|
|
Survival in sea (%) |
92,5 |
92,5 |
92,2 |
93,4 |
|
Survival on shore (%) |
91,4 |
88,8 |
93,5 |
91,5 |
Different biological factors contribute to the result, and these factors vary from year to year.
Departments in the Group´s Farming division, contributes to the work to achieve the main goal, by identifying and working towards their own specific goals for survival. This includes land- and sea-farms.
Policy: Fish health and fish welfare
