Discrimination of origin of farmed trout by means of biometrical parameters, fillet chemical composition and flavour volatile compounds

Turchini, Giovanni, Giani, Ivan, Caprino, Fabio, Moretti, Vittorio and Valfre, Franco 2004, Discrimination of origin of farmed trout by means of biometrical parameters, fillet chemical composition and flavour volatile compounds, Italian journal of animal science, vol. 3, no. 2, pp. 123-140.


Title Discrimination of origin of farmed trout by means of biometrical parameters, fillet chemical composition and flavour volatile compounds
Author(s) Turchini, Giovanni
Giani, Ivan
Caprino, Fabio
Moretti, Vittorio
Valfre, Franco
Journal name Italian journal of animal science
Volume number 3
Issue number 2
Start page 123
End page 140
Publisher Avenue Media
Place of publication Bologna, Italy
Publication date 2004
ISSN 1594-4077
1828-051X
Keyword(s) rainbow trout
oncorhynchus mykiss
fillet quality
flavor volatile compounds
linear discriminant A\analysis (LDA)
Summary To date it is well known that the quality of farmed trout is affected by diet composition, by feeding regime, by husbandry practices and by rearing conditions and environment. The trout processing industry and the large-scale retail trade, in consideration of the wide variability of trout quality and characteristics, have imposed, or will soon impose, quality criteria for the end product. Moreover, recent food scares and the malpractices of some food producers have increased public requests
for traceability. The aim of the present study was to evaluate the main chemical quality and the biometrical characteristics of rainbow trout produced in three different farms in Italy (two intensive farms, located one on mountain and one on plain, and an extensive farm in which fish fed only on naturally available nutrients) and to establish whether farmed trout
origins could be differentiated by these parameters. Trout farmed in the intensive mountain farm (IMF) showed the highest crude 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 fillets
was rich in n-6 fatty acids. Trout stocked for the last year of their life in the extensive farm (EF) were leaner both in the carcass and in the fillets. The analysis of flavor volatile compounds showed some differences in the bouquet design, particularly differences in the amounts of n-3 and n-6 derivates volatile aldehydes and alcohols. All data significantly different
(P<0.05) were subjected to Linear Discriminant Analysis (LDA) and 8 variables were chosen to create two discriminant equations generating a strong prediction model for classification of farmed trout respective to their origins.
Language eng
Field of Research 030106 Quality Assurance, Chemometrics, Traceability and Metrological Chemistry
HERDC Research category C1.1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30004393

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