Chemometric classification of some elements in wild and farmed bluefin tuna (Thunnus thynnus L1758) [Doga ve çiftlik orkinoslari{dotless}nda (Thunnus thynnus l1758) tespit edilen bazi{dotless} elementlerin kemometrik si{dotless}ni{dotless}flandi{dotless}rmasi{dotless}]

Bluefin tuna Thnunnus thynnus 1758 (BFT) belongs to Scombridae family, is native species to subtropical regions of Atlantic Ocean, Mediterranean and Black Sea. The concentration some essential elements (Cu, Fe, Mg, Mn, Ni, Zn) and non-essential element (Pb) have been determined a total of 60 individuals of T. thynnus were collected: 30 captured in the wild and 30 sampled from a tuna farm using flame atomic absorption spectrometry. A preliminary chemometric study with the use of patttern recognition methods was carried out in order to characterise, classify and distinguish the different parts BFT. Multivariate chemometric techniques such as principle component analysis (PCA) and K nearest neighbour (KNN) are used to classify BFT to their type and origin on the basis of chemical data. Metal concentrations seem to be good candidates for classification system, as they are stable. This study clearly reported that PCA procedures appear useful tools for differentiation and classification of wild and farmed BFT using the profile of trace elements.