Isolation and Identification of<i>Aeromonas hydrophila</i>and<i>Saprolegnia</i>sp. on Catfish (<i>Clarias gariepinus</i>) in Floating cages in Bozem Moro Krembangan Surabaya

Abstract

Catfish (Clarias gariepinus) is one of the familiar freshwater fish cultured in Indonesia &#13;\nfarmer. One of the reason is the high mortality of the catfish infected by Aeromonas hydrophila and &#13;\nSaprolegnia sp. Motile Aeromonas septicemia (MAS) is a common bacterial disease, caused &#13;\nby Aeromonas hydrophila, which affects freshwater fish. In Southeast Asia, the outbreak of this &#13;\ndisease was firstly reported from West Java in 1980, when a total of 82.5 tons a month of catfish &#13;\nwere lost, while in Central Java in 1984, the total loss was 1.6 tons. Saprolegniosis can cause &#13;\neconomic loss due to high mortality from its case reaching 10% to 50% . This research aimed to &#13;\nidentify and determine the percentage of A. hydrophila and Saprolegnia sp. the catfish farmed in &#13;\nbozem Moro Krembangan, Surabaya, East Java. Meanwhile, a supporting parameter in this research &#13;\nis the value of water quality parameter including pH, temperature, ammonia and dissolved oxygen &#13;\nthat were measured during sampling. The results showed that of the 20 samples taken from the two &#13;\ncages, 19 fish were positively infected by A. drophila. percentage of infections of A. hydrophila that &#13;\ninfect umbo catfish in Moro Krembangan, was 95%, while the percentage Saprolegnia sp. was 90%.