Prevalence Of Pathologig Changes Associated With The Fin-Rot-Inducing Bacterial Diseases In Fresh-Water Fish

One hundred and twenty tilapias, 40 catfish and 30 common carp were gathered from ponds of central lab. for Aquaculture Researches in Abbassa to study the clinical signs and lesions associated with tail and fm rot. Isolation and identification of the bactattempted. Some of the bacterial isolates were inoculated into 70 catfish and re-isolated. Clinically, the affected fish showed anorexia, loss of balance, floating near the surface of the water, respiratory distress and nervous manifestations. Macroscopic(related to 9 genera of bacterial species). Specific fish pathogens asA.hyDROPhila, Ps. jluorescens and F. columnoris and 6 genera of non-specific fish pathogens (Citrobacter, Klebsiella, Streptococcus, E.coli,Proteus and Shigella spps.) were isolated with very low prevalencepercentages. The predilection seats and rates of prevalence of the differentpathogens showed that fins and tail are considered the primary predilectionseats followed by gills then the internal organs, however, F.columnariswas restricted to fins and gills.