Health status of two salmonid aquaculture facilities in North Portugal: characterization of the bacterial and viral pathogens causing notifiable diseases

Abstract

A comparative bacteriological and virological survey was conducted in two fish farms in the North of Portugal. The fish species examined included cultured rainbow trout, Oncorhynchus mykiss (Walbaum), and brown trout, Salmo trutta L., as well as wild fish captured near both facilities. The microbial load in Portuguese aquaculture. Qualitative and quantitative differences in microbial load were observed betweer cultured and wild fish. No notifiable bacterial or vira pathogens were detected in any of the feral specie! studied.

Bacterial Community Associated with Fish and Water from Congonhas River, Sertaneja, Paraná, Brazil

“…Several of these bacteria are opportunistic pathogens and may cause mortalities when the fish are under stress. Among these were many strains of Aeromonas, which have been the cause of economic losses frequently associated to elevated levels of water pollution (Sousa et al, 1996b). The number of CFU/ml obtained in this research was in the ranges referred by other authors (Horsley, 1973;Sousa, 1996).…”

Occurrence of enteric redmouth disease in rainbow trout (Oncorhynchus mykiss) on farms in Croatia

“…Therefore, it is obvious that the Croatian Y. ruckeri isolates belong to Serotype O1 according to the serotyping scheme proposed by Davies (1990). The same serotype is associated with epizootics and mortality of rainbow trout in Portugal (Sousa et al, 1996), Turkey (Cagirgan and Tanrikul, 1998), and Spain (Romalde et al, 1993).…”

Mixed infections and insect–pathogen interactions

“…Forbes et al . 1999), reptile (Schall & Bromwich 1994; Lainson 2002) and fish (Sousa et al . 1996; Barker et al .…”

“…Nilssen et al 1998;Behnke et al 2001;Cox 2001), bird (e.g. Forbes et al 1999), reptile (Schall & Bromwich 1994;Lainson 2002) and fish (Sousa et al 1996;Barker et al 2002) host systems. Given that insects are subject to challenge from a diversity of parasites and pathogens [e.g.…”