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The role of weed fish species as vectors of diseases of the marketable fish farmed is studied in fisheries in various regions of the republic in the period of 2013-2021. Parasitic infections of weed fish in cyprinid fish farming ponds are revealed. More than 20 species of parasites have been recorded in these two studied fish species. Most of the parasites have a broad specificity and have been found in other fish species. The emergence and re-emergence of fish diseases is often associated with the invasion of disseminators of parasitic diseases in aquaculture. Usually, weed fish play role as propagators of these diseases. Pathogenic infusorians species (Ichthyophthirius multifiliis, Chilodonella piscicola), helminthes (Gyrodactylus elegans, Botriocephalus acheilognathi), and parasitic crustacean (Lernaea cyprinacea) are considered a major cause of high level of morbidity and mortality of the farmed fish in Azerbaijan. [ABSTRACT FROM AUTHOR]