615
Moritellaceae Representatives
Moritella marina (= V. marinus)
Characteristics of the Disease
The organism was associated with shallow skin lesions of Atlantic salmon farmed
in Iceland at low temperatures, i.e. ~10 °C (Benediktsdóttir et al. 1998 ).
Isolation
Benediktsdóttir et al . ( 1998 ) used 5 % (v/v) horse blood agar supplemented with
1.5 % (w/v) sodium chloride with incubation at 15 °C for 7 days.
Characteristics of the Pathogen
Nineteen Icelandic and one Norwegian isolate, and the type strain of V. marinus
NCIMB 1144 were identifi ed as V. marinus after an examination of phenotypic data
and analyses by numerical taxonomy (Benediktsdóttir et al . 1998 ). On the basis of
16S rRNA sequencing the taxon was transferred to a newly established genus, as
Moritella marina (Urakawa et al. 1998 ). However, apart from emphasising a relationship to Shewanella, the authors did not make any comment about family
membership.
Pathogenicity
The LD 50 dose to Atlantic salmon was <3.5 × 10
3 cells (Benediktsdóttir et al. 1998 ).
Box 11.9: Moritella marina
Cultures produce lysine decarboxylase and oxidase but not arginine dihydrolase or ornithine decarboxylase, reduce nitrates, are positive for the methyl
red test but not the Voges Proskauer test, degrade blood (ß-haemolysis), chitin, DNA, gelatin, lipids and starch, do not produce acid from carbohydrates
except N-acetyl glucosamine, maltose, mannitol, mannose and ribose, is
resistant to the vibriostatic agent, O/129, and grow at 4–20 °C but not at
25 °C.
Moritellaceae Representatives
Moritellaceae Representatives
Moritella marina (= V. marinus)
Characteristics of the Disease
The organism was associated with shallow skin lesions of Atlantic salmon farmed
in Iceland at low temperatures, i.e. ~10 °C (Benediktsdóttir et al. 1998 ).
Isolation
Benediktsdóttir et al . ( 1998 ) used 5 % (v/v) horse blood agar supplemented with
1.5 % (w/v) sodium chloride with incubation at 15 °C for 7 days.
Characteristics of the Pathogen
Nineteen Icelandic and one Norwegian isolate, and the type strain of V. marinus
NCIMB 1144 were identifi ed as V. marinus after an examination of phenotypic data
and analyses by numerical taxonomy (Benediktsdóttir et al . 1998 ). On the basis of
16S rRNA sequencing the taxon was transferred to a newly established genus, as
Moritella marina (Urakawa et al. 1998 ). However, apart from emphasising a relationship to Shewanella, the authors did not make any comment about family
membership.
Pathogenicity
The LD 50 dose to Atlantic salmon was <3.5 × 10
3 cells (Benediktsdóttir et al. 1998 ).
Box 11.9: Moritella marina
Cultures produce lysine decarboxylase and oxidase but not arginine dihydrolase or ornithine decarboxylase, reduce nitrates, are positive for the methyl
red test but not the Voges Proskauer test, degrade blood (ß-haemolysis), chitin, DNA, gelatin, lipids and starch, do not produce acid from carbohydrates
except N-acetyl glucosamine, maltose, mannitol, mannose and ribose, is
resistant to the vibriostatic agent, O/129, and grow at 4–20 °C but not at
25 °C.
Moritellaceae Representatives