In this study, convertibility of the fish by-products (FBP) emerging after processing the trout (Oncorhynchus mykiss), sea bream (Sparus aurata) and European sea bass (Dicentrarchus labrax) produced by aquaculture into a raw material that can be used in fish feed ingredient by means of a system called flash dryer has been researched. Before being subjected to drying and grinding in the flash dryer system, the FBP have been passed through the press and decanter, and it has been endeavored to separate the liquid part to the extent possible and to store them separately. At the end of the study, the fatty acids content in the liquid part, the nutrient content, amino acid and fatty acid profile in the solid part have been analyzed. According to the results obtained, it was observed that the solid part could not be used commercially by substituting the fish meal in a rate of one-to-one, and that it could be included in the formulation as a second class raw material although it is not as valuable as fish meal in terms of amino acid balance.
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