Research conducted on early mortality syndrome (EMS)
at a large integrated shrimp farm in Malaysia has indicated that the
disease repeatedly manifests in ponds with an increase in pH to 8.5 to
8.8.
Conducted by Noriaki Akazawa, managing director of
Agrobest Sdn. Bhd., with assistance from Kinki University and the National Research Institute of Aquaculture in Japan, the full research
results are being prepared for publication in a peer-reviewed journal.
EMS, more technically known as Acute
Hepatopancreatic Necrosis Syndrome (AHPNS), has had a significant impact
on shrimp production in Southeast Asia. The research results are
encouraging because they provide shrimp farmers with a tool to improve
management of the disease in ponds.
A review of water quality data from approximately 80 affected and
unaffected ponds stocked during the same month indicated several water
quality differences that were correlated with outbreaks. The researchers
then conducted replicated aquarium trials with controlled levels of
various parameters.
These tests confirmed that the disease repeatedly
regressed at lower pH (around 7) and manifested at higher pH (8.5 to
8.8). Survival rates in Agrobest ponds have greatly improved with
management of pH to avoid the zone of EMS susceptibility.
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| Shrimp farming (Photo credit: Wikipedia) |
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