Oil Separation and Fish Meal
Various processes are known for the manufacture of fish meal and fish oil. Those more or less complex processes, which treat various types of oil-yielding fish such as sardines, anchovies and herrings depending on the countries, generally consist in the cooking the raw materials and then in transferring the cooked product into a decanter in order to remove the water, then the water is treated in order to recover oils using a disc separator. The solid materials are dried and constitute fish meal used, for example, in animal feed.
The fish mixture is prepared by removing its head and viscera possibly using the fish waste. Then the fish is clean by separating the bones and the skin. This mixture is then decanted into a liquid and solid phase.
The liquid phase is then treated to separate the fish oil, and the solid phase is treated to make fish meal.
Protein losses from washing and dewatering are kept to a minimum with Hutchison Hayes decanters specially designed and optimized for surimi processing. The combination of the optimal decanter configuration and process control allows seafood processors to recover 70% of the incoming mince into high-quality surimi. The surimi produced is of highly consistent quality compared with conventional processing, which produces two or three different grades.
The following product descriptions are available in PDF format for download: