Thai shrimp’s improved survival rate will boost production

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Thailand’s change in shrimp production strategies over the years has paid off, and this year producers are expecting a 10-20 percent increase in production, said Siam Canadian General Manager Satasap Viriyanantawanit. “We used to use a high density, super intensive farming method and we had to use an excessively high volume of feed, which caused issues,” he told IntraFish. However, upon switching to lower density stocking for the shrimp ponds, the survival rate changed from 75 percent to 90 percent. “We now [...]

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Selection for disease resistance in Indian white shrimp

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The Indian white shrimp (Fenneropenaeus indicus) is an important species in the aquaculture industry of Egypt, and it has been negatively affected by various major diseases. Several selective breeding programs for farmed shrimp have succeeded elsewhere in improving disease resistance against specific pathogens, indicating that genetic improvement in resistance to several diseases is feasible. However, for optimal implementation of selection for improved disease resistance in a breeding program, it is critical to investigate if significant genetic correlations exist between disease [...]

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Is It Time To Re-examine the Requirements for Shrimp Farm Certification? – Part 1

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The World Wildlife Fund suggested seven indicators – land use, water use, feed conversion ratio (FCR), survival, wild fish inclusion in feeds, dissolved oxygen in receiving waters and energy use – as a means of assessing resource use and negative environmental impacts of aquaculture production facilities. Preliminary results from a survey of shrimp farms in Vietnam and Thailand reveal that these indicators can provide an objective accounting of resource use and negative environmental impacts – including acquisition of the [...]

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Defining Ranges For Water Quality Variables Presents Complex, Challenging Process

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Summary: The creation and application of reference tables for acceptable concentration ranges of physical and chemical water quality variables for culture organisms would be challenging due to the differing tolerances found among the many farmed species. Factors such as water temperature, water chemistry (pH and dissolved oxygen and carbon dioxide levels), exposure time, physiological condition and size of the test animals can all affect tolerance. Especially in ponds, temperature and other water quality variables fluctuate on a daily basis, as [...]

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Shrimp Out Of Water Shipping Live Shrimp In Waterless Conditions

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Summary: Live markets represent a promising niche in regions where locally raised seafood cannot compete with inexpensive imports. Study results suggested regional shrimp producers could effectively reach premium markets by shipping using waterless methods. The optimum combination for waterless shipping of marine shrimp involved water temperature reduction of 10 °C/hour and holding at 12 to 15 °C in moist wood shavings for up to 24 hours. Conditions were similar for freshwater prawns, but they could not tolerate temperatures below [...]

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A Brief History of Shrimp Farming in Vietnam

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Shrimp News: The March 2015 edition of World Aquaculture, the quarterly magazine of the World Aquaculture Society, contains an excellent article by several Vietnamese researchers (see Source below) on the history and current status of shrimp farming in Vietnam.  Here, I report on the history.  I’ll cover the current status elsewhere on this webpage. With diversification of species, systems and organizational structures—hatchery and farm production of marine shrimp in Vietnam has been growing rapidly for several decades, contributing significantly to [...]

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India, Tamil Nadu – Big Problems

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Durai Balasubramanian, secretary of the Pattukottai Shrimp Farmers Association (4,000 members) in the state of Tamil Nadu, reports: There are many reports about the dramatic expansion of shrimp farming in India, but the truth is that farmers in the state of Tamil Nadu have big problems. • In the last year, feed costs have risen 23%, from $1.00 a kilo to $1.31 per kilo. • Over the past two years, seedstock costs have risen 60%. • Farmers have survivals of 80% for the first [...]

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Ecuador thrives with low-density, sustainable shrimp farming model

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White spot devastated Ecuador’s shrimp farming industry more than a decade ago, and recovery has been slow. But today the country’s farmers have found a new formula for success — and it seems to be working. The lowest density shrimp producer in the world Ecuador has, for several years, been taking advantage of its sustainable credentials in the wake of Early Mortality Syndrome’s to sweep of its competitors. The big hole in the shrimp market led the country to increase production by nearly 30 [...]

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Mineral Extract Reduces EMS, White Spot Impacts In Pacific White Shrimp

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Summary: In the search for suitable alternatives to antibiotics and chemical therapeutics for disease treatment and prevention in shrimp, a promising control method is to strengthen non-specific defense mechanisms in crustaceans. The authors recently performed a study to evaluate immunity to white spot syndrome virus and virulent Vibrio parahaemolyticus in shrimp treated with a new mineral extract additive in pelletized feeds. Compared to control animals, shrimp fed the treated diets had significantly higher survival after challenge by injection with the pathogens.   Plastic tanks with 2-m diameters were [...]

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CENIACUA Develops WSSV-Resistant Shrimp In Colombia

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Summary: The 1999 appearance of white spot syndrome virus (WSSV) in white shrimp caused high mortality at shrimp farms in Colombia. To combat the disease, Corporación Centro de Investigación de la Acuacultura de Colombia (CENIACUA) initiated a selective-breeding program to develop WSSV resistance in shrimp. After initially poor survival and slow growth in resistant animals, more recent trials involving segregated and mixed populations of selected and non-selected shrimp, CENIACUA achieved populations much more resistant to WSSV than populations not [...]

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