The resistance of the synthetic population of Indonesian common carp (Cyprinus carpio) to Koi Herpesvirus (KHV)

Abstract

One of the effects of a decrease in the genetic quality of common carp is a decrease in resistance to disease. Establishing a synthetic population, blended from 5 strains, namely Rajadanu, Majalaya, Sutisna, Wildan, and Sinyonya, is expected to increase the disease resistance in the Indonesian common carp population. This study aims to evaluate the resistance of this synthetic population to Koi Herpesvirus (KHV) disease. The three common carp strains, Majalaya carp, Subang carp, and Cangkringan carp, were challenged with a cohabitation approach compared to the synthetic population. The water temperature was adjusted to the optimum condition for KHV development, which ranged from 20 – 22 °C. The result showed that KHV infection started on day three and peaked on days 6 to 10 after cohabitation. At the end of the challenge test, the survival rate of the synthetic population was 62.0 %, significantly higher than other strains (P<0.05), which ranged from 20.0 to 26.7 % of the constituent populations. The results of this challenge test indicated that the synthetic population of common carp had better resistance to KHV infection than other strains of common carp cultured by farmers.