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January 10, 2014

Thailand and Peru

Vibrio Counts in Shrimp Postlarvae

 

A survey done by the Thai Department of Fisheries has set a recommended standard for total Vibrio counts in shrimp postlarvae at less than 1,000 CFU/g (colony-forming units per gram), when cultured in agar before stocking.  Of these 1,000 colonies, a maximum of 100 CFU/g should be green, and the other 900 CFU/g should be yellow.   V. parahaemolyticus colony count should not exceed 30, while no V. harveyi colonies should be present. 

 

Also, some Thai farmers are looking at the shape of the hepatopancreas tubules and their lipid content.  Tubules with smooth epithelia and good lipid content are considered healthy, while shrunken hepatopancreas tubules with low lipid concentration are considered unhealthy.

 

A study at one farm revealed different survival rates of larval depending on the color of their hepatopancreases.  Larvae with brown hepatopancreases appear to be healthier than those with white hepatopancreases.  Check the source below for more information on the color differences.

 

Source: The Global Aquaculture Advocate (The Global Magazine for Farmed Seafood.  The current issue of the Advocate is free, online at GAA’s website).  Editor, Darryl Jory (dejry2525@aol.com).  Hepatopancreas Colors Related to Vibrios Predict Survival of Shrimp to EMS.  Drs. Chalor Limsuwan, Niti Churchird and Natthinee Munkong Wongsiri (Department of Fishery Biology, Kasetsart University, Bangkok, Thailand) and Dr. Carlos A. Ching (email cchingm@alicorp.com.pe, Nicovita/Alipcrp SAA, Av. Argentina 4793, Callao, Lima, Perú), Volume 17, Issue 1, Page 15, January/February 2014.

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