Prevalence and identification fungal of fungal disease on Catfish (Clarias gariepinus) juvenile at Kendal Coastal Region, Central Java

Abstract

Fungal disease on fish frequently as secondary infection and can cause death. It found on wound of fish. The aim of this study was to identify fungi that appeared on catfish hatchery at Kendal Coastal area. Methodology of this research was experimental at exploratory. Based on the method, 10 fungal infected catfish consisted of fish at 5-7 cm and another 5 fish at 8-10 cm length. Prevalence obtained from 80 fish observed in every pond, from 4 ponds. Body wound such as lessions and fin rot suspected of fungal infection were streaked on to Sabouraud Dextrose Agar (SDA) and incubated in room temperature for 2 to 7 days. nine fungi found infected fish sample with various character. The fungi then purified and identified. Based on the morphology characters, the fungi were identified as K.21 (Microsporum sp.), K.22 (Fusarium sp.), K.31 (Aspergillus flavus), K.33 (A. fumigatus), K.71 (A. niger), K.72 (A. nidulans), K.73 (Fusarium oxysporum), K.8 (Trichophyton sp.), and K.9 (Rhizopus stolonifer) the prevalence was 30% (Pond A), 20% (Pond B), 25% (Pond C), 22,5%(Pond D)and fungal dominant rate between 8 and 16%. Postulate Koch were conducted with twice repetition for each fungi to 10 fishes indicated. A. flavus was the most pathogenic fungal species to catfish with mortality 85% while the lowest of causing mortality was R. stolonifer with only 15%.