An amateur in Lima, Peru that deals with the breeding of varieties of the ornamental fish, Golden carp,(Carassius auratus), reported high occurrence of mortalities, 60%-70% of 2000 specimens in a few,days. Of these, 15 specimens (varieties of black telescope, oranda, red cap, lion's head and green coral),were selected in order to study and evaluate the gills and skin. Adult mobile spores and different,juvenile stages of Ichthyophthirius multifiliis "Ich", were found. The “disease of the white point” was,also observed in the presence of monogenean Gyrodactylus sp. and Dactylogyrus sp. Protozoans and,monogeneans were found to be the cause of mortality that also provoked an increase of mucus in the,gills as well as a strong detachment of the epidermis and the loss of,the caudal fin. Only one specimen,was found with hemorrhage in the bottom of the left eyeball. In order to control mortal...

The parasitofauna in tilapia Oreochromis spp., causing mortality in fingerlings in two cultivation centers, Lima, Peru, was evaluated. We analyzed 50 specimens of 4.0 to 7.0 cm in total length of tilapia grown in greenhouse-like systems and ponds. The gills of each sample were tested and the preparations were observed microscopically. The presence of the monogenean Gyrodactylus sp. (70% of prevalence) and two ciliate protozoa, Trichodina sp. (70%) and Ambiphrya (syn. Scyphidia) sp. (83.3%) was recorded. Histological changes in infected gills were observed and some cases, the presence of many aneurysms. 20 mL was applied in 100 L of diluted formaldehyde for one h per day for one week to eliminate or minimize the parasitic mortality.