Gram- staining Gram-negative  pleomorphic rod
Bipolar staining +
Motility Non motile
O/129  sensitivity (150 mg) +
Cytochrome oxidase (OX) +
Catalase +
B –Galactosidase production (OPNG) -
Arginine dihydrolase production (ADH) +
Lysine decarboxylase production (LDC) -
Ornithine decarboxylase production (ODC) -
Citrate utilization (CIT) -
H2S production (H2S) -
Urease production (URE) -
Tryptophanedeaminase production (TDA) -
Indole production (IND) -
Acetoin production (VP) +
Gelatinase production (CEL) -
Acid from glucose (GLU) +
Acid from manitol (MAN) -
Acid from inositol (INO) -
Acid from Sorbitol (SOR) -
Acid from rhamnose (RHA) -
Acid from sucrose (SAC) -
Acid from  frommelibiose (MEL) -
Acid from amygdalin (AMY) -
Acid from arabinose (ARA) -
O/F test Fermentative without gas production.
Table 1: Phenotypic and biochemical characteristics of retrieved P. damselae subsp. piscicida isolates.