Drying systems for fish and protein products
A narrower margin than fruit, and we engineer for it.
Drying fish and protein products removes moisture at a low enough temperature to avoid cooking the protein while staying above the range where spoilage organisms multiply. Lines run at 45–50 °C over 24–30 hour cycles to a final moisture of 15–20 %, with humidity control and hygienic zone separation designed in from the outset.
The window is narrow in both directions
Above roughly 50 °C the protein begins to coagulate at the surface: texture changes and a crust forms that traps moisture inside, which is the same case-hardening failure that afflicts high-sugar fruit but with a food-safety consequence attached. Below the working band, the product spends longer in the temperature range where spoilage organisms are most active.
That leaves a narrower operating window than fruit drying allows, and it is why humidity control matters as much as temperature here. A graduated moisture reduction — fast enough to pass through the risk zone, slow enough not to seal the surface — is the specification.
Hygiene is a layout decision, not a cleaning decision
Intake, preparation, drying and packing should run in one direction, with separate waste and drainage routes and food-grade surfaces throughout. This is designed at layout stage. Retrofitting hygienic separation onto a plant built for a single product is difficult and usually fails an audit, which is why we ask about product mix before we ask about capacity.
The PLC logs temperature and time per batch. For fish especially, that record is the evidence a buyer or an inspector asks for, and it is worth more than an assurance.
Products in this family
| Product | Drying temperature | Target moisture | Hygiene / pathogen note |
|---|---|---|---|
| Fish and seafood | 45–50 °C | 15–20 % | 24–30 h cycles; zoned layout and per-batch logging |
| Tilapia (farmed) | 45–50 °C | 15–20 % | Short window between landing and processing |
| Biltong | Product specific | Product specific | Cured before drying; humidity control is the main variable |
| Game meat | Product specific | Product specific | Traceability and cold-chain integrity before the dryer |
| Seaweed | Product specific | Product specific | Salt content changes the drying curve |
| Honey (drying / creaming rooms) | Product specific | Product specific | Low-temperature conditioning rather than drying |
The equipment behind these crops
- biomass hot air generator
- industrial tunnel dryers
- multi-fuel biomass burner
- turnkey biomass drying plant
Detailed pages by crop and country
Frequently asked questions
Why not dry fish hotter to finish faster?
Above about 50 °C the protein coagulates at the surface, texture changes and a crust forms that traps moisture inside. The 45–50 °C band over 24–30 hours is the trade between drying speed and product integrity, and pushing past it produces a product that looks finished and is not.
How is pathogen risk actually controlled?
By moving through the risk temperature range at a controlled rate, reaching 15–20 % final moisture as the water-activity barrier, and by layout: one-directional zoning, food-grade surfaces, full cleaning access and independent drainage. The PLC record of temperature and time per batch is the documentation that turns all of it into evidence.
Can fish and fruit share a facility?
Yes, but only if it is designed that way from the start — separate preparation areas, dedicated tunnels, and independent waste and drainage routes. The two also want different windows — 45 to 50 °C for fish against 65 to 70 °C for mango. Adding fish to a plant built for fruit is difficult, and in most audit regimes it does not pass, so tell us the product mix before we size anything.
Size a line for your crop
Tell us the product, the daily fresh throughput and the fuel you can source. An engineer replies within one business day.
Request sizing