At Eyvi, we see by-products a resource full of potential. Fish sludge – made up primarily of fish excreta – contains valuable nutrients such as phosphorus, nitrogen, potassium, and organic carbon. These are essential building blocks for fertile soil and healthy plant growth, helping to renew and enrich soil quality in areas that have become depleted over time.
Our technology makes it possible to transform this material into something of real value. The sludge is carefully collected, treated, and dried through a safe and hygienic process that makes it stable and free from harmful bacteria. The end product is a nutrient-rich base for organic fertiliser, ready to re-enter the agricultural cycle and support more sustainable food production.
A strong example of this approach is found at Hima Rjukan [link to project], where Eyvi has delivered a complete sludge treatment facility. Here, fish sludge is dried to 90–95% dry matter (DM), producing a stable, transportable, and long-lasting product. The project demonstrates how modern land-based aquaculture can contribute far beyond fish production – by creating new value chains, reducing waste, and returning nutrients to nature.
With Eyvi’s by-product management solutions, aquaculture operators can:
• Operate more sustainably and efficiently
• Reduce environmental impact and overall footprint
• Create new value streams from existing processes
• Restore and improve soil health while reducing the need for chemical fertilisers
• Demonstrate responsibility and innovation to regulators, partners, and customers
