The Atlantic salmon is filleted in the country of origin and then transported fresh to Mowi. Upon arrival, the fish is then salted.

Dry salting

The Atlantic salmon is filleted in the country of origin and then transported fresh to Mowi. Upon arrival, the fish is then salted. Karel Coussement, Quality Manager at the smoking company: “This is carried out automatically using a dosing machine which distributes the salt evenly over the surface of the fillet and takes the thickness of the fish into account." Dry salting gives the product a characteristic texture and flavour. In addition, the technique ensures that water is drawn out of the fish, reducing the water activity and ensuring microbial stability during the shelf-life of the product. There then follows a maturing period of 4 to 24 hours (dependent upon the size and fat content of the fillet) in order to give the salt time to penetrate the salmon.

The salmon is then placed in smoking units for 10 to 18 hours and dried so that it can continue the maturation process. Karel Coussement: “We let the salmon 'rest’ for two to three days in refrigerated units. During the process, the salt is naturally distributed throughout the fish. The trimming process then follows, when the fillet is skinned and, in some cases, the smoked crust and the muscle fat is removed. The fish is then cut; partly manually for fish and specialist stores and sometimes for food service clients, and automatically for the retail sector." The process ends with the product being vacuum packed.

Strict delivery is vital

For the Mowi smoke-house, it is vital that the salt is always available. Karel Coussement: “The many process steps and the maturing period mean that it takes four to five days before we can cut and pack the fish. Even though we always have salt in stock, at peak moments we may need to order more. It is vital that it is delivered within 24 hours in order to guarantee the continuity of the production process. ZOUTMAN offers an exceptional service in this area. The deliveries always occur within the agreed time-frames.

Two birds with one stone

The delivery guarantee was one of the reasons why Mowi got involved with ZOUTMAN in the first place, but it was certainly not the most important. Karel Coussement: “Until 2006, we worked with a local supplier. When we invested in a new salt machine, we found that the grain size that we had been using previously was not suitable for ensuring the machine worked effectively. In close collaboration with ZOUTMAN, we investigated the issue and this eventually led to the right grain size for our production process being identified. In 2006, we were also asked to smoke organic salmon for the Benelux market. In this context, we are not able to use any anti-caking agents. ZOUTMAN had a solution which meant we could kill two birds with one stone: they could supply salt without anti-caking agents with a grain size that was suitable for the salt machine; this meant that we didn't have to work with two different types of salt."

Bert Lamote from ZOUTMAN: “Sea salt offers a natural range of grain sizes. When we process a batch of sea salt, these various grain sizes are sorted into categories and stored separately. This enables us to supply the grain size that is most suitable for the customer’s specific needs. In the case of Mowi, it transpired that salt with a diameter of between 0.8 and 1.2 mm would be best for the salt machine and this also meant that anti-caking agents were not required.


Sea salt is much more ecologically responsible than classic kitchen salt. Bert Lamote: “Sea salt is extracted naturally by evaporating the pure sea water in salt basins. The combination of sun and wind creates a salt crust that is harvested by machine. Sea salt is also extracted from an inexhaustible and renewable source. Processing only involves washing, drying and sieving; steps that require a lot less energy than the extraction and processing of vacuum salt.” Karel Coussement: “The ecological nature of sea salt was a deciding factor in the argument for choosing ZOUTMAN. Given the fact that more and more customers, consumers and Mowi itself are focusing on sustainable products, the choice of sea salt was an added bonus for us.

The ecological nature of sea salt was a deciding factor in the argument for choosing ZOUTMAN.
Karel Coussement - Quality manager at Mowi

Pure sea salt

Even though sea salt has a reputation for containing more natural impurities than vacuum salt, Mowi has had no complaints. Bert Lamote from ZOUTMAN: “In our ultra-modern production facility in Roeselare, we have an optical cleaning machine that scans the salt and removes impurities pneumatically. As a result, we can supply salt that, in terms of impurities, is the same as vacuum salt, but with all of the benefits of sea salt.

Satisfied customers

Mowi is a very satisfied customer. “ZOUTMAN supplies top quality products, maintains strict supply reliability standards, constantly works on improving processes and is also very flexible”, explains Karel Coussement. “A few years ago, for example, we asked for the salt to be supplied in 25 kg bags instead of 50 kg bags in order to help with ergonomics for our operators. ZOUTMAN had no problem fulfilling this requirement and adapted immediately. Another bonus is that the salt supplier is BRC and IFS certified, which means we don't have to audit them every year to ensure they meet the requirements of our quality system. ZOUTMAN and Mowi have worked together very successfully for some time now; their relationship is definitely worth its salt!

This article was published in Technical salts, Food salt