Gill disease of fry and fingerlings associated with extensive mortality in rainbow trout freshwater farms in Denmark have been observed on an increasing number of occasions in the latest years. Clinical symptoms of hyperventilation indicate respiratory distress. Gross-pathological observations of gills show pale nodules and patches on gill filaments. Histological and scanning electron microscop...

This case is reported with the intention of highlighting the presentation of primary intestinal amoebic disease in Heckel discus Symphysodon discus. The morphology of the parasites and the pathological changes seen using light microscopy were essential. In fresh samples of intestinal content we discovered numerous amoeba-like cells. The trophozoite measures 18.6 x 10.2 mm while the cyst is 11-2...