مختصر البحث:
The present study was conducted to isolate and diagnose the bacterial infection of liver of common carp fish,
with investigated the histopathological changes in effected organs. 102 common carp fish were collected from
fish farms located in the ar…
The present study was conducted to isolate and diagnose the bacterial infection of liver of common carp fish,
with investigated the histopathological changes in effected organs. 102 common carp fish were collected from
fish farms located in the area of the Abbasia, Najaf, Iraq, During six month of experimental period extended
from 1st January to 1st July of 2016. The experimental period of current study was divided into two periods (three
month each), first period was started from 1st January to 1st April and the second period was started from 1st April
to 1st July . liver samples were collected for bacterial isolation and identification, with histopathological
examination. Pathogenic agents were isolated and identified by using culture media (Nutrient agar, Salmonella -
Shigella agar, MacConkey agar , pseudomonas agar and EMB agar), biochemical tests and Api20 test for
confirmation.Result of this study showed differences between the bacterial isolates in first period from bacterial
isolates in second period. The results of bacterial isolates in the first period were (E.coli 23.5%, Enterobacter
21.6% and Aeromonashydrophila 7.8% for the months January, February and March ) , while results of the
bacterial isolates in the second period were (E. coli 35.3%, klebseliaoxytoca 15.7%, Salmonella Spp 3.9%,
Pseudomonas aeruginosa 7.8% , K.pneumonia 9.8%). Histopathological results show Vaculation, necrosis and
nuclear condensation were observed in hepatocytes of effected livers. In conclusion, According to the results
obtained in this study, we investigated that , the time period from April up to July pathogenic agent ratio was
more than pathogens agent ratio that was isolated in the months of January, February and March.
Keywords: common carp, Bacterial disease ,Aeromonashydrophila, liver
