Prevalence and intensity of ectoparasites in Nile Tilapia (Oreochromis niloticus) at BBI Babadan and BBI Bendogerit Blitar Regency

Abstract

The availability of high quality fish seeds is a key factor in the success of tilapia (Oreochromis niloticus) cultivation. The fry phase is particularly vulnerable to disease, especially ectoparasites that can inhibit fish growth. This study aims to analyze the prevalence and intensity of ectoparasites in tilapia seeds at the BBI Babadan and the BBI Bendogerit, located at Blitar Regency. The fish samples used were 15 tilapia fish measuring 4-8 cm, which were taken randomly from each pond in each Fish Seed Center. Examination of ectoparasites in tilapia seeds (O. niloticus) was carried out on the surface of the fish's body, including external organs such as gills and fins, under a microscope at 100x magnification. The results of the study have found 11 species of ectoparasites in the BBI Babadan and 7 species of ectoparasites in the BBI Bendogerit. The level of Trichodina sp. parasite attack on tilapia in the Babadan BBI showed the highest prevalence, with a prevalence value of 100%. The Apiosoma sp. species at BBI Babadan exhibited the highest parasite intensity, with an intensity of 23 individuals. Water quality measurements at both BBIs showed pH and NH₃ levels exceeding the established limits, potentially causing stress and deteriorating fish condition. Sustainable management is essential to suppress parasitic infections and improve the quality of tilapia fry in cultivation.