Prevalensi dan Intensitas Ektoparasit Ikan Nila (Oreochromis niloticus) di Bendungan Telaga Tunjung, Tabanan

This study aims to determine the value of the prevalence and intensity of ectoparasites in Tilapia (Oreochromis niloticus) in Telaga Tunjung Dam, Tabanan Regency and measure the parameters of water quality such as temperature, pH, and DO. The number of tilapia studied were 30 individu, the sampling fish were carried out at 3 stations in the Telaga Tunjung Dam. Station I was the dam intlet area, station II was the middle part of the dam and station III was the Telaga Tunjung dam outlet. Identification of ectoparasites was carried out at the Fisheries Science Laboratory, Aquatic Resources Management Study Program, Faculty of Marine and Fisheries, Udayana University. Ectoparasites were identified in the mucus, dorsal, caudal, operculum and gill organs of the tilapia by skin scrapping and wet mount methods. Data were analyzed by descriptive quantitative. The results from the three stations showed the prevalence value with the "Usually" criteria, which is still in the moderate level of infection. At stations I and III the prevalence value is 70% and at station II is 80%. The intensity value obtained at station I is 6.7 (ind/ind) with an infection rate of "Medium" while in stations II and III the infection rates are "Low" which are 4.0 (ind/ind). The temperature in the three stations ranged from 26.8-28.2 ?, pH values in the three stations ranged from 7.3 to 8.2 and DO values ranged from 4.3 to 5.5 mg/l, indicated that the temperature, pH and DO in the Telaga Tunjung Dam are still in the optimal category for supporting the life of aquatic organisms.