Qualitative indicators of river fish with opisthorchiasis

Abstract

The purpose of the work is to conduct veterinary and sanitary examination of fish with opisthorchiasis. Samples were selected according to the unified rules for the sampling of agricultural products, food products and environmental objects for laboratory tests (GOST 7731-85). The objects of research were: crucian caught in the water area of the Kuibyshev reservoir, and a carp mirror, grown in the Gasaniv Institute of the Sengeleevsky district of the Ulyanovsk region. We conducted studies of fish caught and grown in the Ulyanovsk region. For the study, species of fish that were close in their biological characteristics were selected. 90–95% of the fish examined were infected with opisthorchiasis. The defeat of carp two-year olds with opisthorchiasis did not have a significant effect on hematologic indices. The defeat of fish with opisthorchiasis did not affect the parameters of protein, carbohydrate, lipid and mineral metabolism. At the same time, the chemical composition of muscles (water – 74.60 ± 8.56%, fat – 3.21 ± 0.63%, protein – 17.90 ± 0.57%, ash – 1.90 ± 0.09%), affected by opisthorchiasis does not significantly differ from the conventional norm (water 68,5–79,1%, fat 1,6–9,5%, protein 15,6–19,4%, ash 1,5 – 2.5%). Organoleptic examinations of ice cream samples showed: the surface of the fish is clean, natural in color, inherent in fish of this species, without external damages, dense consistency, has the smell characteristic of benign fish. Gills are dark red. In determining the parasitic contamination, all samples were affected by opisthorchiasis. A similar picture is observed in the study of carp. The conducted toxicological studies of fish: the determination of the content of lead, arsenic, cadmium, mercury, pesticides (HCH, DDT, 2, 4Dic acid) of volatile N-nitrosamines showed that in all the test samples the concentration of toxic substances does not exceed acceptable levels. The number of mesophilic aerobic facultative anaerobic microorganisms in the body of carp and crucian carp within the permissible norm. In the bacteriological study of carp and crucian carcass, there were no cultures of CGB (coliform bacteria), S. aureus, Salmonella, Listeria monocytocenes.