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January 2, 2016

Malaysia

Research—Organic Acids in Shrimp Feeds

 

From Abstract (full paper available from the link in the Source below):

 

The threat of disease in the shrimp farming industry, coupled with greater restrictions or bans on antibiotic use, has increased interest in evaluating antibiotic alternatives.  A promising alternative is organic acids, which have been used for decades in the livestock feed industry as an antimicrobial and growth promoter.  However, very limited information exists on their applications in shrimp farming.

 

The aim of this study was to examine the potential beneficial effects of a novel microencapsulated organic acid blend to the production of tiger shrimp, Penaeus monodon, in earthen ponds at a commercial farm.  The experimental group was fed a commercial shrimp feed supplemented with 2% organic acid (Diet B).  The control group was fed the same diet without supplementation (Diet A).

 

After 22 weeks of growout, shrimp were randomly sampled and transferred to the laboratory to examine any effects on nutrient utilization, resistance of shrimp to Vibrio harveyi and associated hepatopancreatic histopathology and phenoloxidase (PO) activity.  Results showed that shrimp growth was similar in both treatments, however, lower nitrite-N and nitrate-N concentrations in the pond water indicated potential improved protein utilization from shrimp fed Diet B.  This was supported by data from the digestibility trial, demonstrating crude protein, but also dry matter, ash and phosphorous, utilization was significantly enhanced.  Total viable bacteria and presumptive Vibrio species counts were lower at the end of the growout period in the pond water of shrimp fed Diet B.  Shrimp fed Diet B showed significantly higher survival to V. harveyi challenge, likely due to enhanced PO activity and less hepatopancreatic damage.  Total viable bacterial and Vibrio counts in the hepatopancreas of shrimp fed Diet B were significantly lower compared to Diet A.

 

This study provides the first reported data on the use of dietary organic acids at a commercial shrimp farm.  The enhancement to nutrient utilization could reduce feeding costs and improve water quality while the higher resistance of shrimp to pathogenic bacteria such as Vibrio species could provide shrimp farmers with an effective method to mitigate disease outbreaks.

 

Source: Aquaculture.  Farm-Raised Tiger Shrimp, Penaeus monodon, Fed Commercial Feeds with Added Organic Acids Showed Enhanced Nutrient Utilization, Immune Response and Resistance to Vibrio harveyi Challenge.  Wing-Keong Ng (email wkng@usm.my, Fish Nutrition Laboratory, School of Biological Sciences, Universiti Sains Malaysia, Penang 11800, Malaysia, phone +60-4-6533888,  fax + 60-46565125), Chik-Boon Koh, Chaiw-Yee Teoh and Nicholas Romano.  Volume 449 (Proceedings of the 16th International Symposium on Fish Nutrition and Feeding), Pages 69–77, December 1, 2015.

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