Tuesday, March 20, 2018

21/03/2018: AHPND can kill your shrimp – Anta®Ox FlavoSyn can protect them

Following a high occurrence of reports in Bangladesh districts close to West Bengal regarding incidences of Acute Hepatopancreatic Necrosis Syndrome in shrimp, also known as AHPND or previously named as EMS, authorities have increased the alert

An emergency response team under the National Surveillance Program for Aquatic Diseases will undertake surveillance in the area. The State Government advised that in case of confirmation of the AHPND incidence, all stock at the affected farms will be destroyed and disposed of and the whole farm will be disinfected. 

Image credit: Dr Eckel

All other coastal states in India are requested to be vigilant and to monitor the shrimp aquaculture farms for prevention and control of any incidence.

The disease is a newly emerging threat but has already done serious damage to shrimp production and the shrimp aquaculture industry worldwide. It was first detected in China in 2009 and moved in the region, later crossing the Pacific with several reports from Latin America in recent years. Notable symptoms of affected shrimps include an empty gut and pale hepatopancreas. AHPND has been discovered to be caused by toxic strains of Vibrio parahaemolyticus that have acquired a ‘selfish plasmid’ encoding the deadly binary toxins PirAvp/PirBvp. Morbidity can reach 100 percent, and lead to 100 percent mortality within 20 to 30 days after a pond gets stocked with shrimp postlarvae.
Figure 1: Lower Vibrio counts in the hepatopancreas of Pacific White Shrimp
Image credit: Dr Eckel

 Studies have revealed that phytogenic products can have anti-bacterial activity and have the capability to improve immune response. Therefore they have a high potential to improve the survival rate of some aquatic organism. A specific group of plant extracts called polyphenols has many biological effects including antioxidative, anti-inflammatory, and antimicrobial qualities, making them valuable ingredients for health promotion.

Recent studies performed in cooperation with the Faculty of Fisheries at Kasetsart University, Thailand, revealed how including Anta®Ox FlavoSyn (by Dr. Eckel Animal Nutrition GmbH & Co. KG, Germany) in the shrimp diet leads to excellent results. This was demonstrated under laboratory conditions when the animals were challenged with Vibrio spp. as well under commercial farm conditions in large ponds affected by AHPND. 

Figure 2: Hepatopancreas of Pacific White Shrimp.
Top: 20-80 percent with cell necrosis.
Bottom : Healthy hepatopancreas
Image credit: Dr Eckel
Pacific White Shrimps that were fed with Anta®Ox FlavoSyn not only showed better growth parameters (1.35.1 vs. 1.55:1 FCR in the control group) but also improved histomorphology of the hepatopancreas, with no signs of atrophy and bacterial infection. In contrast, the control group showed 20–80 percent of hepatopancreatic cells damaged. All these benefits allowed for an improved survival rate of 91 percent in the product group, compared with only 63 percent in control.
For more information visit the Dr Eckel website, HERE.

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