Impactul mono și poliinvaziilor asupra unor indici biochimici la Crapul-Comun (Cyprinus carpio Linnaeus, 1758)

This study evaluates the impact of mono- and polyinvasions on biochemical indices in common-carp (Cyprinus carpio). Blood samples were collected from 40 specimens and divided into four groups based on parasitic infestation: group I – uninfested, group II – infested with Dactylogyrus extensus, group III – infested with Khawia sinensis, and group IV –polyinfested with both species of parasites. The biochemical analysis revealed significant reductions in triglycerides, cholesterol, and glucose levels in the infested groups. Notably, triglyceride levels decreased by 1.1% in group II, 11.66% in group III, and 13.11% in group IV compared to the uninfested group. Cholesterol levels showed similar trends, with the lowest values in polyinfested specimens. Conversely, levels of bilirubin and uric acid increased in infested specimens, suggesting impaired liver function due to parasitic stress. Bilirubin levels rose by 27.13% in polyinfested specimens compared to the uninfested group, while uric acid levels increased by 32.6%. These findings highlight the detrimental effects of parasitic infections on the metabolic health of common-carp, emphasizing the need for differentiated monitoring in aquaculture to manage the cumulative risks associated with multiple parasitic infestations.