the parameter that observed is the changes of macroscopic which includes clinical symptoms, the change of morphological body of the fish and gills change. The collection of the fish sample start from zero day (not infected), 1st, 2nd and 3rd. The research had been use of the artificial infection. The research start from March-April 2016 at Department of Cangkringan Fisheries, Sleman and veterinary medicine laboratory of UGM. seen from the time of infection and to see how long infection of Argulus sp. This research attempts to compare structure histology damage gills of fantail goldfish (Carassius auratus) that was attacked by Argulus sp. Ectoparasite that attacks gills can cause death acute. Fantail goldfish (Carassius auratus) was interested by the fans fish.The cultivation of fantail goldfish need to vigilance against parasite, especially Ectoparasite.
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