Figure 1

Gross presentation of infected Cyprinus carpio with macroscopic cysts in the intestine. (A) Infected scattered mirror carp (Cyprinus carpio) with swollen abdomen (red arrow). (B) Abdominal anatomy of infected carp: numerous cysts (yellow arrows) caused swellings that blocked the intestinal lumen in carp; (C–E). The cyst was in direct contact with intestinal mucosa. (F) Cross-section of cyst within the dotted box in D and E (H&E stain, bar = 500 µm).