Moist diet for farmed fish




Jón Örn Pálsson

Supported by:

AVS Fisheries Research Fund. Preliminary project (S 034‐05)

Moist diet for farmed fish

Gellyfeed is a synonym for a two-stage production process of aquaculture feed. The method was developed with the aim of reducing storage costs and producing strong feed pellets. Studies confirm that long-term leaching of raw materials and storage impairs the quality of proteins and renders the raw material unsuitable for wet feed production. The maximum shelf life of fish raw material in a strong alkaline state is 14 days. The method can be useful for killing bacteria, viruses and parasites. Options for storage of raw materials for wet feed production are freezing and digestion processing. The production of wet feed from by-products that occur in the northern Westfjords can be a promising option. The legislation of the European Economic Area does not prohibit the use of by-products from wild cod in feed for farmed cod.

Gellyfeed is a name of a two-step production process of moist diet for farmed fish. The process is developed to reduce the cost of preserving by-products and to make a physical strong pellet. Research confirms that alkaline preserved raw material and longtime storing damage the protein quality and make the raw material not suitable for use in moist diet. Maximum storing time of alkaline preserved by ‐ products is 14 days. The process can be practical for eliminating harm from bacteria, viruses or parasites. The alternative methods for storing by ‐ products are freezing or silage production. Moist diet produced from by ‐ products from the northern region of the Westfjords in Iceland seems to be economically promising option. The legislation from the European Union does not forbid using by-products from wild cod as a raw material in production of moist diet.

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