629
Characteristics of the Pathogens
In one case, the pathogen was described as a Gram-negative rod of 0.86 +/−
0.32 × 0.63 +/− 0.24 μm in size, and thought likely to be a representative of the
Rickettsiaceae (Chern and Chao 1994 ).
A Tasmanian isolate from Atlantic salmon was distinct from Piscirickettsia in
terms of sequence alignment of the 16S rRNA, and for the present regarded as an
RLO (Corbeil et al. 2005 ).
Disease Control
Antimicrobial Compounds Treatment with oxytetracycline was reported to be
successful in one case (Chern and Chao 1994 ).
Streptobacillus
A possibly unique organism has been recovered from seawater farmed Atlantic
salmon in Ireland. The organism, which occurred intracellularly in tissues, was considered to be related to Streptobacillus moniliformis and the fusobacteria on the
basis of 16S rRNA analyses (Maher et al . ( 1995 ). BHI supplemented with 10 %
(v/v) foetal calf serum and 1 % (w/v) sodium chloride with incubation for 10 days
at 22 °C was used to recover the organism (Maher et al. 1995 ).
Fig. 11.1 The reddened area associated with red mark disease syndrome (= winter strawberry
disease) in >500 g rainbow trout
Rickettsia-Like Organisms
Characteristics of the Pathogens
In one case, the pathogen was described as a Gram-negative rod of 0.86 +/−
0.32 × 0.63 +/− 0.24 μm in size, and thought likely to be a representative of the
Rickettsiaceae (Chern and Chao 1994 ).
A Tasmanian isolate from Atlantic salmon was distinct from Piscirickettsia in
terms of sequence alignment of the 16S rRNA, and for the present regarded as an
RLO (Corbeil et al. 2005 ).
Disease Control
Antimicrobial Compounds Treatment with oxytetracycline was reported to be
successful in one case (Chern and Chao 1994 ).
Streptobacillus
A possibly unique organism has been recovered from seawater farmed Atlantic
salmon in Ireland. The organism, which occurred intracellularly in tissues, was considered to be related to Streptobacillus moniliformis and the fusobacteria on the
basis of 16S rRNA analyses (Maher et al . ( 1995 ). BHI supplemented with 10 %
(v/v) foetal calf serum and 1 % (w/v) sodium chloride with incubation for 10 days
at 22 °C was used to recover the organism (Maher et al. 1995 ).
Fig. 11.1 The reddened area associated with red mark disease syndrome (= winter strawberry
disease) in >500 g rainbow trout
Rickettsia-Like Organisms