Rainbow trout is often regarded as one of the most promising commercial aquaculture species: it grows fairly fast, is relatively undemanding and has high-quality meat rich in protein and omega-3 fatty acids. For consistent results, however, suitable water and rearing conditions are not enough; feeding also matters and should come as close as possible to the natural needs of a predator.

In the wild, rainbow trout feed on insects, crustaceans and small fish, so their diet normally contains a significant share of animal protein and fat. Modern trout feeds often use fish meal and meat-and-bone meal, trout oil, albumin, shrimp meal, gammarus, wheat gluten, soy, spirulina, astaxanthin and other ingredients.

In the early stages (fingerlings of 10-100 g) the fish needs more protein for active growth and tissue building, so its share in the diet is about 40-45%, while fats and carbohydrates can each be at 15-20%.

In adult fish (100 g - 1 kg) it is important that protein is used for growth rather than as an energy source; for this reason its content is usually reduced to 30-35%, while the carbohydrate share is raised to 20-25% and fats are kept at 15-20%.

Given the biological characteristics of trout, the DXY fish feed production line makes it possible to obtain high-quality feed:

1. Slow-sinking pellets

Raw materials are fed into the fish feed extruder, where they undergo high-temperature, high-pressure processing with simultaneous forming. The result is sinking or slow-sinking fish feed pellets, which matches the feeding behaviour of trout.

2. High fat content

Rainbow trout growth requires a high fat content in the feed. Conventional atmospheric spraying is limited by the surface tension of the liquid, so the amount of oil added is usually small. The vacuum coater removes air from the pellets; when the vacuum is released under pressure, liquid components penetrate inside, so the fat content can be increased noticeably.

3. High palatability

1) A vacuum environment at moderate temperature helps prevent the inactivation of fats and heat-sensitive components (vitamins, amino acids, etc.), preserving more nutrients.

2) Rainbow trout have a well-developed sense of taste and smell. The vacuum coater allows fish meal extracts, amino acids and other substances to penetrate evenly into the pellets, reducing nutrient losses from friction and impact. As a result, the feed continuously releases aromatic substances after entering the water, greatly improving palatability and feed intake.

4. Water stability

Water stability is achieved through starch gelatinisation and the presence of proteins and fats. Pellets usually hold their shape well in water, which helps reduce feed losses and water pollution.

5. Digestibility

Extrusion processing makes nutrients more available, which helps accelerate fish growth.

6. Functional additives

The coating equipment applies oils, vitamins and other beneficial components to the pellets, which not only improves feed taste but also raises its overall nutritional value.

7. Extended shelf life

Drying reduces pellet moisture for reliable storage. Cooling stabilizes the structure and prevents caking. Together these steps help preserve feed quality throughout the shelf life.

The DEXIYA fish feed line includes mixing, extrusion, drying, coating, sieving, cooling and packaging, enabling continuous production. The equipment configuration can be flexibly selected and optimised according to the customer's capacity, investment budget and raw material characteristics.

Contact us - we will be glad to develop a custom solution for your tasks and propose the optimal line configuration.

Email: dxymachinery_manager@mail.ru

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