Bacteriological Monitoring Of Ships’ Ballast
Water In Singapore And Its Potential
Importance For The Management Of
Coastal Ecosystems
Author(s)
V. Ivanov
Abstract
The bacteriological quality of ships’ ballast water was studied to evaluate the
risk of invasion by alien bacterial species in Singapore. Guidelines of the
International Maritime Organization (IMO) are currently in place concerning the
threat posed by invasive pathogens due to uncontrolled discharge of ballast water
and sediment from ships. The bacteriological quality of ship’s ballast water was
studied to evaluate the risk of invasion by alien bacterial species in Singapore.
The concentrations of total bacteria, enterobacteria, Vibrio spp., and Escherichia
coli have been compared for ballast water samples taken from ships in Singapore
Harbour. The share of facultative-anaerobic bacteria, which are often the agents
of water-borne diseases, in a ship’s ballast water was usually higher than in
seawater, especially for the cases when the ballast water tank was filled to the
top. Samples of ballast water contained from 0.7 to 39.5% of eubacteria, 0 to
2.5% of enterobacteria, 0.2 to 35.8% of Vibrio spp., and from 0 to 2.5% of E.
coli. The significant percentage of Vibrio spp. in some samples of ballast water
shows possibly increased risk of invasion of microbial pathogens as ballast water
will be discharged in coastal area. Simple self-manufactured chromogenic test kit
for coliforms in water showed semi-quantitatively the level of faecal pollution in
water. The regular monitoring of ballast water for selected microbial pathogens
must be performed continuously for reliable conclusions. Disinfection of ballast
water, discharged in the coastal area of Singapore, can be recommended as
mandatory treatment if some microbial pathogens are frequently detected in the
ship’s ballast water.
Keywords: ballast water, bacteriological monitoring, coliforms, Vibrio sp.
Keywords
ballast water, bacteriological monitoring, coliforms, Vibrio sp.
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