Vet Med - Czech, 2022, 67(12):628-637 | DOI: 10.17221/73/2022-VETMED

Nitrogen factors for rainbow trout (Oncorhynchus mykiss) and brook trout (Salvelinus fontinalis) filletsOriginal Paper

A Honzlova1, H Curdova1, L Schebestova1, P Bartak1, A Stara2, J Priborsky2, M Sandova2, A Koubova2, Z Svobodova2, J Velisek2
1 State Veterinary Institute Jihlava, Jihlava, Czech Republic
2 Research Institute of Fish Culture and Hydrobiology, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Faculty of Fisheries and Protection of Waters, University of South Bohemia in Ceske Budejovice, Vodnany, Czech Republic

Measures for consumer protection against food adulteration and misleading labelling are integrated into EU legislation, including methods for detecting misleading practices. Verification of the meat content is available for marine products, but not for salmonid fish due to the lack of standard nitrogen factors. This study aimed to establish nitrogen factors for rainbow trout (Oncorhynchus mykiss) and brook trout (Salvelinus fontinalis). The study analysed 340 fish from Czech fisheries obtained in the summer of 2018-2020. According to the established ISO methods, fillet samples with and without skin were analysed for their nitrogen content (protein), dry matter, ash, and fat. The recommended nitrogen factor for rainbow trout fillets with and without the skin is 3.07 ± 0.12 and 3.06 ± 0.14, respectively, and the nitrogen factor for fat-free rainbow trout fillets with and without the skin is 3.33 ± 0.15 and 3.29 ± 0.15, respectively. The recommended nitrogen factor for brook trout fillets with and without the skin is 3.16 ± 0.10 and 3.12 ± 0.09, respectively, and the nitrogen factor for fat-free brook trout fillets with and without the skin is 3.42 ± 0.13 and 3.36 ± 0.12, respectively. The established nitrogen factors will enable the analysis of the meat content to ensure that consumers purchase correctly described and labelled fish products.

Keywords: adulteration; fish-food fraud; fish products; nitrogen factor; salmonid

Received: September 10, 2022; Accepted: November 11, 2022; Prepublished online: November 29, 2022; Published: January 1, 2023  Show citation

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Honzlova A, Curdova H, Schebestova L, Bartak P, Stara A, Priborsky J, et al.. Nitrogen factors for rainbow trout (Oncorhynchus mykiss) and brook trout (Salvelinus fontinalis) fillets. Vet Med - Czech. 2022;67(12):628-637. doi: 10.17221/73/2022-VETMED.
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