title: Microbiological Investigation of Persistent Mortalities in Litopenaeus vannamei Grown in Low Saline Waters in India.
abstract: Abstract Microbial diseases are a serious hindrance to successful shrimp aquaculture. The Pacific white shrimp Litopenaeus vannamei is an exotic species recently introduced in India to supplement the failing aquaculture of the Asian tiger shrimp Penaeus monodon due to viral diseases. However, after a brief initial success, the aquaculture of L. vannamei is also experiencing serious problems due to microbial diseases. In this study, we conducted a microbiological investigation into the problem of persistent mortalities in selected L. vannamei farms on the southeastern coast of India. The infected shrimps were positive for the white spot syndrome virus (WSSV) by a nested PCR, though no visible white spots were present on the animals. The shrimps were heavily colonized by Vibrio parahemolyticus, which were isolated from the hepatopancreas, gills, and the body surface. The pond water, despite being low saline groundwater, harbored large numbers of V. parahemolyticus and other Vibrio species, and V. parahemolyticus isolated from L. vannamei were resistant to β-lactam antibiotics and cephalosporins. Our results strongly suggest that the persistent mortalities of L. vannamei were due to a co-infection by V. parahemolyticus and WSSV. Received December 16, 2013; accepted February 14, 2014.
authors.affiliation: a Central Institute of Fisheries Education , Seven Bungalows, Versova, Andheri W, Mumbai 400061 , India.
authors.forename: Hirekudel
authors.initials: H
authors.lastname: Sanathkumar
authors.forename: Charan
authors.initials: C
authors.lastname: Ravi
authors.forename: Suresh Babu
authors.initials: SB
authors.lastname: Padinhatupurayil
authors.forename: Mini
authors.initials: M
authors.lastname: Mol
authors.forename: Jilagam Krishna
authors.initials: JK
authors.lastname: Prasad
authors.forename: Binaya Bhusan
authors.initials: BB
authors.lastname: Nayak
mesh_terms: D000818:Animals; D060085:Coinfection; D007194:India; D033561:Penaeidae / Q000382:microbiology*; D000068357:Saline Waters; D046848:White spot syndrome virus 1 / Q000302:isolation & purification* / Q000472:pathogenicity