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Fish Feed Drying 

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Introduction

Fish feed manufacturing is a precision-intensive process where drying occupies a critical intermediate step between the extruder or pellet press and the finished product packaging or storage line. Extruded fish feed pellets exit the extruder at moisture contents between 22% and 28%, and at temperatures that leave them structurally soft and vulnerable to deformation under mechanical handling. Effective post-extrusion drying using purpose-designed industrial drying systems must reduce moisture to a stable 8–12% while simultaneously cooling the pellet to below 35°C, hardening the pellet shell, preserving the integrity of heat-sensitive lipid coatings and vitamin premixes, and preventing any browning or off-flavour development that would affect feed palatability and fish acceptance. Kerone Engineering Solutions engineers multi-zone belt dryer-cooler systems specifically for aquaculture feed applications, where the combination of controlled temperature zoning, precise airflow management, and high hygienic standards determines both production yield and the nutritional quality of the finished pellet.

Why Choose Kerone Fish Feed Drying

Kerone’s expertise in fish feed drying extends beyond thermal engineering to encompass the biological constraints of aquaculture nutrition. The company’s engineers understand that fish feed pellets contain lipid-coated particles where peroxidation—accelerated by heat and oxygen exposure—directly reduces omega-3 retention and palatability. Kerone therefore designs drying systems with controlled inlet air temperatures, short residence time at peak temperature zones, and integrated cooling sections that minimise the total time pellets spend at elevated temperature. Kerone’s fish feed dryer-cooler units are constructed with food-grade stainless steel conveyor belts and structural elements, facilitate CIP-compatible drainage, and meet the FSSAI, BIS, and relevant Codex Alimentarius hygienic equipment requirements that aquaculture feed manufacturers must demonstrate to export market customers. Kerone also offers co-current and counter-current airflow configurations within the same belt unit, allowing fine-tuning of the drying profile for different pellet formulations and pellet diameter ranges from 1 mm juvenile feed to 10 mm breeder pellets.

Types and Features of Fish Feed Drying

Kerone’s fish feed drying product line centres on multi-zone continuous belt dryer-cooler units that combine a drying section with an in-line cooling section within a single insulated housing, eliminating the need for separate conveying between dryer discharge and cooler inlet. The drying section operates with recirculated heated air directed through the perforated belt in alternating up-flow and down-flow zones, equalising moisture removal across the pellet bed depth. The integrated cooling section uses ambient or chilled air to reduce pellet temperature to within 5°C of ambient before discharge. For manufacturers producing both sinking and floating feed, Kerone also supplies fluid bed dryers with gentle vibration that are effective for small-diameter floating feed pellets (1–3 mm), and batch tray drying ovens for small-scale specialty aquaculture diets.

Types and Features of Fish Feed Drying

  • Multi-zone belt dryer-cooler: combined drying and in-line cooling in a single insulated stainless steel housing
  • Alternating up-flow/down-flow air configuration for uniform pellet bed moisture removal across belt width
  • Food-grade stainless steel 316L construction on all product contact surfaces for aquaculture hygienic compliance
  • Outlet moisture control to 8–12% with outlet temperature within 5°C of ambient for direct packaging
  • PLC-controlled zone-by-zone temperature, airflow, and belt speed adjustment
  • Sanitary drainage and CIP-compatible structural design for scheduled wash-down programmes
  • Modular extension sections allowing belt length increase to accommodate capacity expansion
  • Integrated heat recovery from exhaust air to pre-heat incoming fresh air, reducing specific energy consumption

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Applications of Fish Feed Drying

Kerone’s Fish Feed Drying systems are extensively used in aquaculture feed manufacturing and related industrial drying applications.
Typical applications include:
    • Post-extrusion drying and cooling of floating and sinking fish feed pellets (1–10 mm diameter)
    • Shrimp feed pellet drying for moisture stabilisation before lipid coating application
    • Ornamental and juvenile fish feed drying where fine pellet integrity is paramount
    • Fishmeal drying in fish processing factories for moisture reduction and microbial stabilisation
    • Speciality aquaculture diets: eel, sea bass, tuna, and salmon feed pellet drying

    Pet food and animal nutrition pellet drying using the same belt dryer-cooler platform

Fish feed pellet quality is fundamentally a drying quality issue. Inadequate drying leaves pellets soft, prone to crushing in transit, and microbiologically unstable. Over-drying destroys nutritional integrity and increases pellet friability. Kerone Engineering Solutions has invested significant engineering effort in designing dryer-cooler systems that navigate this narrow operating window reliably, batch after batch, shift after shift. With hygienic construction, precise multi-zone control, and integrated energy recovery, Kerone’s fish feed drying systems give aquaculture feed manufacturers the process certainty they need to compete on product quality in premium export markets. Contact Kerone to discuss your fish feed production throughput and pellet specification requirements.

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Frequently Asked Questions (FAQ)

  • Kerone's belt dryer-cooler systems reduce post-extrusion pellet moisture from 22–28% down to a stable 8–12% wet basis, suitable for direct packaging or lipid coating application.

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