Investigation of Antibiotic Residue, Nitrofuran Compounds, Microbial Properties and Heavy Metal Amount in Rainbow Trout (Oncorhynchus mykiss)

ABSTRACT

The aim of this study was to determine the pathogenic microorganisms, antibiotic residues, and metal concentrations in rainbow trout (Oncorhynchus mykiss) fillets grown in 3 different regions in Trabzon and to determine their compliance with the limit values determined by national (Turkish Food Codex) and international legislation (Codex Alimentarius commission, European Comission). Of the 46 antibiotic residues and 4 nitrofuran residues searched, none of the fillets were detectable and all were below the maximum residue limit. The highest number of aerobic colony count was found at 3.2 × 10⁴ (A2 location). Enterobacteriaceae<10 cfu/g, Escherichia coli<3 MPN/g and<10 cfu/g, Staphylococcus aureus<10 cfu/g, and Coliform bacteria<3 MPN/g and<10 cfu/g were detected. Listeria monocytogenes, Salmonella spp. Vibrio cholera, and Vibrio parahaemolyticus were not found in any of the locations. Metal concentrations, Pb, Cd, and Hg observed were below the limits set by the legislation. The results show that rainbow trout fillets cultivated in offshore fish farms in 3 different regions are below the maximum limit values specified in national and international regulations in terms of antibiotic residue amount, heavy metal content, and microbiological properties.

KEYWORDS:

• Oncorhynchus mykiss
• Turkish Salmon
• antibiotic residue
• microbiological properties
• heavy metal

Acknowledgments

I would like to thank the relevant company that provided the rainbow trout samples and the companies where the analyses were carried out.

Disclosure statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Author statement

The work does not involve the use of animal or human subjects for experiments.

CRediT authorship contribution statement

Özen Yusuf ÖĞRETMEN: Methodology, Conceptualization, Data collection, Data visualization, Writing and Editing.