Histopathology of gill parasites ın cultured seabream (Sparus Aurata) and seabass (Dicentrarchus Labrax)

This study was carried out to define the gill parasitic diseases and histopathological findings of seabream and seabass, which are frequently cultured in Turkey. The material of the research consists of dead fish samples suspected of disease that came to the Kanyon Akua Veterinary Clinic Disease Diagnosis Laboratory between January 2021 and January 2022. A total of 5,250 fish, including 3,150 seabass (Dicentrarchus labrax) (D. labrax) and 2,100 seabream (Sparus aurata) (S. aurata), weighing between 2-350 g, were used in the study. After the total length and weight of the samples were measured, they were divided into groups for pathological and parasitological examinations. As a result of the examinations, eight different parasites were detected, which caused intense infestation in sea bream and sea bass fish. Among these disease agents seen in seabass; Diplectanum spp., Cryptocaryon spp., Amyloodinium spp., Trichodina spp, Cryptobia spp., Costia spp. Parasites seen in sea bream were; Microcotyle spp., Furnestinia spp., Trichodina spp., Costia spp. The parasites seen in both are; Trichodina spp. and Costia spp. The most common histopathological findings were lamellar edema, necrosis, hemorrhage, telangiectasia, lamellar fusion, spills, infiltration of macrophage, lymphocyte and eosinophilic granulated cells. The most common parasitic agent in the field seabass was Diplectanum spp. and the most common parasitic agent in seabream was Microcotyle spp. The highest mortality (10%) and the most severe histopathological lesions were detected in Amyloodinium spp. The incidence of multiple agents (multi-parasitism) in the cases was higher than the dence of single agents.