Bệnh xuất huyết do vi khuẩn gây ra ở cá hồi vân (<i>Oncorhynchus mykiss</i> Walbaum, 1792) nuôi thương phẩm tại Lâm Đồng

Abstract

    This paper presents studying results of hemorrhage disease caused by bacteria on rainbow trout (Oncorhynchus mykiss Walbaum, 1792) growing out in Lam Dong Province. A total of 58 rainbow trout specimens (mean length 289.2± 21.2 mm) with signals of hemorrhage disease were used for bacterial isolation and determination; 95 healthy rainbow trout specimens (mean length 275.5± 10.6 mm) were used for Aeromonas hydrophila infection and 95 healthy rainbow trout specimens (mean length 260.5± 20.5 mm) were used for Burkholderia cepacia infection. Eight species of bacterium were isolated from the hemorrhage fish, including Aeromonas hydrophila, Burkholderia cepacia, Edwardsiella tarda, Escherichia vulneris, Escherichia hermanii, Klebsiella pneumoniae, Proteus vulgaris and Stenotrophomonas maltophilia. Of which, A. hydrophila and B. cepacia were found from 79.3% and 41.4% of the examined fish, respectively; E. tarda and P. vulgaris were found in 22.4% the examined fish; E. vulneris and K. pneumoniae were found in 15.5% examined fish; S. maltophilia, E. hermanii were found in 3.4% examined fish (2/58). Infection studying results showed that, A. hydrophila was the one causing hemorrhage disease on growth-out rainbow trout in Lam Dong Province.

Keywords: Aeromonas hydrophila, hemorrhage disease, Lam Dong Province, rainbow trout (Oncorhynchus mykiss Walbaum, 1792).