Determination of pathogen caused the red eye disease for black carp (Mylopharyngodon piceus) and efficacy of treament

Abstract

This study was performed to identify the causative agent of red eye disease in black carp and to
evaluate the efficacy of treatment regimen. The disease situation was investigated, fish samples were
collected and brought to the laboratory for diagnosis through culture methods, bacterial morphology
determination, identification by biochemical test and PCR assay. The pathogenic bacteria strains
were tested for their susceptibility with antibiotics and 1 appropriate antibiotic was selected for the
experimental treatment. The studied results showed that black carp suffering with red eye symptoms
faced a high mortality rate, the causative agent was Streptococcus agalactiae. The antibiotic tests
revealed that this bacteria was susceptible with amoxiciline and the treatment regimen for red eye
disease was conducted by using amoxicilline mixing in feed at a dose of 45-50 mg per kg fish per
day, feeding fish for 5 consecutive days, as a result 80% of the disease fish were recovery.