608
Pathogenicity
Infections were achieved following i.m. injection with 5 × 10
5 cells/fi sh for 7–21 days
(Aydin et al. 2002 ).
Disease Control
Antimicrobial Compounds Sensitivity was recorded to formalin and enrofl oxacin, with bathing in the former followed by oral application of the latter controlling
natural infection (Aydin et al. 2000 ).
Comamonadaceae Representative
Delftia acidivorans
Ps. anguilliseptica and Delftia acidivorans was recovered from a consignment of
glass eels in Barcelona Airport, Spain. The eels presented with lethargy and disorientation, open skin lesions, sloughing off of skin behind the gills, vent and caudal
fi n, enlarged kidney and spleen. A few of the animals swam rapidly and erratically
in a circular pattern, reminiscent of whirling disease. Material from diseased tissues
was inoculated onto TSA, BHIA and TCBS with incubation at 22 °C, and after
7-days there was evidence of Ps. anguilliseptica and Delftia acidivorans as confi rmed by sequencing of the 16S rDNA gene, and comparison of the data with the
GenBank data base. Delftia produced greyish-beige slightly glossy colonies with
irregular edges, and which comprised Gram-negative catalase- and oxidase-positive
organisms. Treatment was achieved with baths of formalin and hydrogen peroxide,
and bathing and then oral application of gentamycin with sulphadiazinetrimethoprim (Andree et al. 2013 ). Unfortunately, pathogenicity of the isolates was
not confi rmed in laboratory-based infectivity experiments.
Hahellaceae Representative
Hahella chejuensis
This organism has been associated with red egg disease of tilapia hatcheries in
Thailand (Senapin et al. 2016 ).
11 Miscellaneous Pathogens
Pathogenicity
Infections were achieved following i.m. injection with 5 × 10
5 cells/fi sh for 7–21 days
(Aydin et al. 2002 ).
Disease Control
Antimicrobial Compounds Sensitivity was recorded to formalin and enrofl oxacin, with bathing in the former followed by oral application of the latter controlling
natural infection (Aydin et al. 2000 ).
Comamonadaceae Representative
Delftia acidivorans
Ps. anguilliseptica and Delftia acidivorans was recovered from a consignment of
glass eels in Barcelona Airport, Spain. The eels presented with lethargy and disorientation, open skin lesions, sloughing off of skin behind the gills, vent and caudal
fi n, enlarged kidney and spleen. A few of the animals swam rapidly and erratically
in a circular pattern, reminiscent of whirling disease. Material from diseased tissues
was inoculated onto TSA, BHIA and TCBS with incubation at 22 °C, and after
7-days there was evidence of Ps. anguilliseptica and Delftia acidivorans as confi rmed by sequencing of the 16S rDNA gene, and comparison of the data with the
GenBank data base. Delftia produced greyish-beige slightly glossy colonies with
irregular edges, and which comprised Gram-negative catalase- and oxidase-positive
organisms. Treatment was achieved with baths of formalin and hydrogen peroxide,
and bathing and then oral application of gentamycin with sulphadiazinetrimethoprim (Andree et al. 2013 ). Unfortunately, pathogenicity of the isolates was
not confi rmed in laboratory-based infectivity experiments.
Hahellaceae Representative
Hahella chejuensis
This organism has been associated with red egg disease of tilapia hatcheries in
Thailand (Senapin et al. 2016 ).
11 Miscellaneous Pathogens