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This study extends the original description of Eimeria dicentrarchi Daoudi and Marquès, 1987, a common coccidian parasite of European sea bass from the mid-eastern Adriatic, by providing insights into the parasite’s site of infection, development and pathogenicity. E. dicentrarchi was found in various developmental stages in most segments, mainly anterior, of the digestive tract. In infected segments of the digestive tract, merogonic and gamogonic stages were located in the enterocyte cytoplasm, whereas sporogonic stages were situated in the epithelium and occasionally beneath it, in the lamina propria. Most oocysts in the lumen of the digestive tract were completely sporulated, indicating endogenous sporulation. E. dicentrarchi infection caused localised histopathological changes, restricted primarily to individual epithelial cells. Additionally, the results of our preliminary study suggest that oral administration of potentiated sulphonamide Trimetosul® (trimethoprim-sulfadiazine) may be effective against E. dicentrarchi infection., Ovo istraživanje doprinosi izvornom opisu kokcidije Eimeria dicentrarchi Daoudi i Marquès, 1987, koja se učestalo pojavljuje u lubina u istočnom dijelu srednjeg Jadrana. U radu je prikazan njezin smještaj u probavnoj cijevi, razvojni ciklus i patološki učinak na domaćina. Prisutnost razvojnih stadija E. dicentrarchi utvrđena je u raznim dijelovima probavne cijevi, uglavnom u prednjem dijelu crijeva. Čitav razvojni ciklus odvija se u citoplazmi enterocita, iako do sporogonije dolazi i u lamini propriji. Oociste većinom potpuno sporuliraju u probavnoj cijevi što upućuje na unutarnju sporulaciju. E. dicentrarchi uzrokuje lokalizirane histopatološke promjene primarno ograničene na pojedinačne epitelne stanice. Rezultati preliminarnog istraživanja pokazuju da potencirani sulfonamid Trimetosul® (trimetoprim-sulfadiazin) može biti učinkovit u liječenju invazije kokcidijom E. dicentrarchi.

This study presents data on the pathogenic effect of a non-native cestode, Atractolytocestus huronensis (Caryophyllidea), on common carp cultured at a fish farm in Croatia. Histopathological examination revealed that A. huronensis causes only local damage within the infected part of the intestine. No differences were observed in the pathological effect of the tapeworm on fish of different age classes. In the farm studied, no mortalities or increased losses during wintertime were observed. The cestode was found in all examined age classes (i.e. carp fry, one-year old and two-year old carp), and the intensity of infection ranged from 1 to 183 parasites per fish (mostly 4 to 9). The highest prevalence was observed during August in both one- and two-year old carp, with an absence of parasites in April and during the winter period (end of December)., U radu je prikazan patološki učinak trakavice Atractolytocestus huronensis (Caryophyllidea) na šarana, podrijetlom s ribnjačarstva smještenog u Republici Hrvatskoj. Histopatološki nalaz pokazao je da, neovisno o uzrasnoj skupini šarana, Atractolytocestus huronensis uzrokuje samo ograničena oštećenja na mjestu prihvaćanja. Kao posljedica nametničke invazije, nisu utvrđena uginuća niti povećani gubitci tijekom zime. Prisutnost trakavice utvrđena je u svim pregledanim uzrasnim skupinama (mladunci, jednogodišnji i dvogodišnji mlađ) s jačinom invazije od 1 do 183 nametnika po domaćinu (najčešće od 4 do 9). Najviša prevalencija kod jednogodišnjega i dvogodišnjega mlađa utvrđena je u kolovozu, dok u travnju i tijekom zime (kraj prosinca) trakavica nije pronađena.