Production of fish oil from maatjes herring by-products
Aidos, I.; Luten, J.B.; Boonman, M.; van der Padt, A.; Boom, R. (2000). Production of fish oil from maatjes herring by-products, in: Georgakis, S.A. (Ed.) Proceedings of 29th WEFTA meeting 10-14 october, 1999 - Leptocarya - Pieria, Greece. pp. 352-361
In: Georgakis, S.A. (Ed.) (2000). Proceedings of 29th WEFTA meeting 10-14 october, 1999 - Leptocarya - Pieria, Greece. Greek Society of Food Hygienists and Technologists: Thessaloniki. , more
At present, the Dutch fish industry sells their waste to fish meal plants in Germany and Denmark to be converted into fish meal, pet food and fish oil. This fact does not take advantage of the freshness and quality of the fish by-products. An attempt of upgrading by-products from the maatjes herring production into fish oil has been made using a pilot plant with a heat exchanger and a three-phase decanter. The crude herring oil obtained had an initial peroxide value, anisidine value and free fatty acids of 3 meq/kg of fat, 8.9 and 2.9%, respectively. EPA and DHA polyunsaturated fatty acids were present in considerable amounts (99 and 91g/kg respectively). After processing, the FFA content remained low (3%), even after 35 days of storage at 50°C. Unfortunately, at 50°C the totox value increases to unacceptable levels. However, when the crude oil is stored at ambient temperature in the dark environment the characteristics of the oil remain stable. This opens the possibility for fish oil production using salted herring by-products.
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