1. Discrimination of origin of farmed trout by means of biometrical parameters, fillet composition and flavor volatile compounds
- Author
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Fabio Caprino, Vittorio Maria Moretti, Ivan Giani, Giovanni Mario Turchini, and Franco Valfrè
- Subjects
Rainbow trout, Oncorhynchus mykiss, Fillet quality, Flavor volatile compounds, Linear Discriminant Analysis (LDA) ,Animal culture ,SF1-1100 - Abstract
To date it is well known that the quality of farmed trout is affected by diet composition, by feeding regime, by husbandrypractices and by rearing conditions and environment. The trout processing industry and the large-scale retail trade, in considerationof the wide variability of trout quality and characteristics, have imposed, or will soon impose, quality criteria forthe end product. Moreover, recent food scares and the malpractices of some food producers have increased public requestsfor traceability. The aim of the present study was to evaluate the main chemical quality and the biometrical characteristicsof rainbow trout produced in three different farms in Italy (two intensive farms, located one on mountain and one onplain, and an extensive farm in which fish fed only on naturally available nutrients) and to establish whether farmed troutorigins could be differentiated by these parameters. Trout farmed in the intensive mountain farm (IMF) showed the highestcrude lipid content in the fillets and the fatty acids of their fillets were characterized by the highest percentage of MUFA.Trout farmed in the intensive plain farm (IPF) were characterized by low dressing percentage, and the lipid of their filletswas rich in n-6 fatty acids. Trout stocked for the last year of their life in the extensive farm (EF) were leaner both in thecarcass and in the fillets. The analysis of flavor volatile compounds showed some differences in the bouquet design, particularlydifferences in the amounts of n-3 and n-6 derivates volatile aldehydes and alcohols. All data significantly different(Pequations generating a strong prediction model for classification of farmed trout respective to their origins.
- Published
- 2010
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