As a result of proteins and other organic waste in the water, foam can form in hatcheries and can be detrimental to the health of the fish if not managed properly. Foam extraction using overpressure therefore plays a key role in maintaining water quality. By spraying water at high pressure over the surface of the tank, unwanted foam can be removed: As the spray droplets hit the individual bubbles, this breaks the bubbles up and therefore removes the foam.

After hatching, the size of the salmon fry is constantly monitored. It is important that the fish grow at approximately the same rate. Otherwise, larger fish will grow stronger and more dominant while smaller ones have difficulties to survive. To avoid this imbalance, the fish are sorted at regular intervals. Vacuum allows the live fish to be moved gently from one tank to another via suction conveying.

As in the hatcheries, the fish need to be sorted to ensure that they grow evenly. Pneumatic overpressure conveying allows live fish to be sorted and moved gently between tanks without physical stress, promoting uniform growth and minimizing injury. A blower or compressor pushes the air and the fish through a sealed pipeline, creating a form of bridge from one tank to another. The fish passes safely and rapidly through the tube and into the next tank.

For fish that are kept in tanks rather than in the sea, effective aeration is essential for their health and growth. While the oxygen content in the open sea is constantly being refreshed, a tank will eventually run out. As a result, overpressure systems are used for ventilation, providing a constant flow of oxygen that is critical for fish survival.

Overpressure systems are also an integral part of the cleaning process of the tanks. By introducing air at high pressure, debris and waste can be dislodged and removed, ensuring a clean habitat for the fish.

For fish living in cages out in open water, special feed barges are used to distribute feed. Feed is drawn from an internal silo, and high-pressure air provided by blowers push the fish feed through feed lines and into the cages.

The ocean is not just one habitat: at different depths, there are entirely different landscapes and conditions for the fish that live there. While fish that live in tanks or in fish farms do not have these same conditions, they will still move into the respective area of the tank or cage that corresponds to the depth at which they would live in the open ocean. This must therefore be taken into account during the manufacture of fish meal so that the correct nutrition reaches the correct depth.

Vacuum is used for fish meal impregnation. By impregnating the food to give it different buoyancies, the food will float at different depths so that it reaches the correct fish. Vacuum helps draw the additives evenly into the pores and crevasses of the fish meal, giving a uniform and repeatable result.

In fish processing, vacuum is used to suction out intestines and remove off-cuts, ensuring that the processing area remains clean and compliant with health regulations. These by-products are reused, for example, to produce fish oil and fish food. The remaining waste is then transported out of the facilities by means of pneumatic conveying.

Once all waste and by-products are removed, it is time for filleting. In this process step, fish is placed on the filleting table, where vacuum is often used to securely hold the fish in place. The vacuum prevents any movement that could affect the precision of the cuts. This method improves the efficiency and consistency of the filleting process. Afterwards, the filleted fish is transported to be vacuum packaged.

In order to maintain the quality and freshness of the fish while it is being processed, it is important to keep it cool. Ice is therefore transported via pneumatic conveying systems to the processing stages, where it is used to keep the fish at a low temperature.