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OJVRTM
Online Journal of Veterinary Research©
(Including Medical and Laboratory Research)
Established 1994
ISSN 1328-925X
Volume
30 (4): 233-242, 2026.
Prevalence
of Streptococcus agalactiae
in tilapia in canals, ponds, pools, rivers and reservoirs.
Amal AMN, Zamri-Saad M, Siti-Zahrah A, Zulkafli R, Misri
S, Nur-Nazifah M, Shahidan H.
1Faculty of Veterinary Medicine, University Putra Malaysia, Serdang, Malaysia2National Fish Health
Research Center, Penang, Malaysia Freshwater
Fisheries Research Center, Negeri Sembilan, Malaysia
ABSTRACT
Amal AMN, Zamri-Saad
M, Siti-Zahrah A, Zulkafli
R, Misri S, Nur-Nazifah M, Shahidan H. Prevalence of Streptococcus agalactiae
in tilapia in canals, ponds, pools,
rivers and reservoirs. Onl J Vet Res, 30 (4): 233-242,
2026. We isolated Streptococcus agalactiae from tilapias kept
in fast flowing irrigation canals, slow flowing ponds and pools, rivers and flowing
reservoirs. Over 24 months 713 tilapias were collected from canals, 708 in ponds,
633 in pools, 2,610 in rivers and 1,729 from reservoirs. Tilapias were kept in
floating net cage-culture system and dissected
for brain, eye and kidney streaked directly onto blood agar for Gram
stain, API 20 STREP kit, Slidex Strepto-kit and PCR. We isolated Streptococcus agalactiae
in all water samples but found differences (p<0.05) on prevalence in fish in
reservoirs (12.50%) with water flow 0.006±0.003 cm/seconds compared with rivers
with flow of 0.25±0.24 cm/seconds, pond (0.70%), canal (0.28%) and pools (0.17%).
We recorded (p<0.05) higher mortality in tilapias kept in reservoirs in temperatures >29.510C 10-30 cm and 100-350g.
We found correlations (r=0.9312,
P=0.0008) between S. agalactiae
and mortality n reservoirs with Staphylococcus
spp. Findings suggest that water temperature, rate of water flow and size
of fish may affect prevalence of S. agalactiae in tilapia.
Key
words: Streptococcus agalactiae,
Tilapia, canals, pools, ponds,
rivers, reservoirs.
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