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Microsoft word - ifar 2008 elboshy final report
Final report for IFAR project 2008
Proposal code: 267IFAWAN.
Name of Applicant: Dr. Mohamed El-Sayed Mohamed El-Boushy
Assistant Professor of Clinical Pathology Faculty of Veterinary Medicine, El Mansoura University, Egypt.
1. Proposed Work Program:
The possible impact of common zoonotic and food borne bacteria on fish and
human health with suggestive control measures
The Objectives of the study:
Assessment of the epidemiology of zoonotic and food borne bacteria:
Survey of antimicrobial usage in Egyptian aquaculture:
: Investigating the prevalence of antimicrobial residues in cultured fish:
Investigating the prevalence of antimicrobial resistance in fish bacteria:
Developing fish health management plan (preventive measures):
Summary to the achieved Work.
1: Assessment of the epidemiology of zoonotic and food borne bacteria:
Zoonotic bacteria were isolated and identified as Aeromonas spp., Pseudomonas
& Yersinia sp
with a total percentage of 21.6, 18.33 & 10.0%, respectively.
Food borne bacteria were isolated and identified as Salmonella
sp., E. coli,
and Bacillus cerus
, with a total percentage of 7.5, 5.8, 15.8 & 5.0%;
Polymerase Chain Reaction (PCR) was used to identify A. hydrophila
as a most
common zoonotic bacteria where PCR showed a sequence of
which is A. hydrophila1
(target gene is
infected group exhibited signs of anemia. . Leukocytosis was
observed in all infected groups (Aeromonas spp., Pseudomonas spp
.), with significant differences between the groups.
Regarding biochemical parameters, liver dysfunction was recorded in all
infected groups (increase ALT, AST). A decrease in total protein and albumin
was also observed in some of the Pseudomonas
Renal dysfunction, including elevated creatinine and uric acid blood levels, was
2: Survey of antimicrobial usage in Egyptian aquaculture:
Antimicrobial treatment during the disease course is expensive; the use of
oxytetetracylcine as a therapeutic dose for 1 h will typically cost a farm 150LE,
while the use of ciprofloxacin for the same farm costs 450LE.
We investigated antimicrobial misuse in aquaculture, in which many farmers
used oxyteteracycline as a prophylactic and as a growth promoting drug.
3: Investigating the prevalence of antimicrobial residues in cultured fish:
Antimicrobial residues in the muscles of cultured fish during the field study
were undetectable in some cases. However, tetracycline was detected at a
higher rate than ciprofloxacin, which was minimal.
Fish treated with these antimicrobials showed some haematology and serum
biochemistry changes, such as haemolytic anaemia, and mild renal disorders
(ciprofloxacin), mild liver impairment and elevation of liver transaminase,
(tetracycline group) and marked renal impairment with anaemia (sulpha
The study of elimination rates for antimicrobials established that these varied
from 41 to 180 µg ciprofloxacin/kg fish tissue weight/week, while for
tetracycline this was 51 to 265 µg/kg fish tissue weight per week. Highest
values were typically observed during the first week, and the lowest values
during the 3d week post-treatment, but varied according to type of antibiotic,
water temperature, water quality, health condition of fish (especially liver and
kidney function). Catfish showed higher clearance rates of antimicrobials than
tilapia. Our preliminary conclusions are that antimicrobials should not be used
with fish for a period of at least 3 weeks prior to harvest.
4: Investigating the prevalence of antimicrobial resistance in fish bacteria:
Isolated zoonotic and food borne bacteria were found to be resistant to
It was obvious that there was some cross resistance between bacterial isolates
from both the same and different environments.
5: Developing fish health management plan (preventive measures):
Two experiments using immunostimulants and probiotics were carried out to
improve fish resistance to bacterial infections. Promising results were achieved.
It is recommended that a biological filter be used and that use of chicken
manure and poultry byproduct are avoided in order to limit the entry of
zoonotic and food-borne bacteria to aquaculture facilities.
If manure is to be used, chemical, biological or physical treatment should be
As evidenced by these findings, the work was completed and the funds received were spent as stated in the candidate’s budget. Currently, future collaboration between WorldFish and the Faculty of Veterinary Medicine, El Mansoura University is in operation and two scientific papers are being under development.
Dr Salah Mesalhy
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