Evaluation of the potential use of discard species for fish silage and assessment of its oils for human consumption

• Published in: International journal of food science & technology 2019-04, Vol.54 (4), p.1081-1088
• Main Authors: Özyurt, Gülsün, Özkütük, Ali Serhat, Uçar, Yılmaz, Durmuş, Mustafa, Ozogul, Yesim
• Format: Article
• Language: English
• Subjects: Anisidine; Docosahexaenoic acid; Edible oils; Eicosapentaenoic acid; Fatty acid composition; Fatty acids; Fermented food; Fish; fish oil; Fish oils; fish silage; Freshwater fish; Human wastes; lactic acid bacteria; Lipids; Marine fish; Nutrients; Oils & fats; Organic chemistry; Peroxide; polyunsaturated fatty acid; Polyunsaturated fatty acids; Silage; Thiobarbituric acid
• ISSN: 0950-5423; 1365-2621
• DOI: 10.1111/ijfs.13954

Summary Waste or by‐products contains a substantial amount of nutrients. Fish silage is an alternative way for assessment of fish discards and waste generated in the fish processing industries. The aim of the study was to evaluate the potential use of discard species (Equulites klunzingeri, marine fish and Carassius gibelio, freshwater fish) for fish silage and chemical quality of fish oil extracted from fish silages prepared with acid and fermented methods. Lipid quality of fish oils extracted from fish silages with LAB strains was evaluated in terms of thiobarbituric acid (TBA), peroxide value (PV), p‐Anisidine (AV), totox values and fatty acid composition. The results showed that PV, TBA, AV and totox values of all extracted fish oils were within the acceptable limits for edible oils. Recovered fish oils from silage contained high level of polyunsaturated fatty acids (PUFAs), especially eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), serving as a source of good quality fish oil for human consumption. Fish discards involve ecological and environmental concerns. Production of fish silage is a way of reducing these problems. Function of lactic acid bacteria species and formic acid on potential use of discard fish for silage processing were assessed. Fish oil extracted from fermented fish silages with LAB had generally higher quality than the acid ones. Recovered fish oils from silage contained high level of PUFAs especially EPA and DHA, serving as a source of good quality fish oil for human consumption.