Indian seafood revenue may soften in FY19

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KOCHI: After two years of robust growth, India’s seafood exports may ease in 2018-19 due to an increase in supply of shrimps, sluggish purchases by the US and the impact of higher anti-dumping duty, according to Crisil Research. Growth in India’s seafood export revenue may drop to 17% to 18% in 2018-19, the research house said in its latest report. That compares with growth of 21% and 31% in the previous two financial years, which was triggered by a crunch [...]

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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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Massachusetts – John Sackton on EHP

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At the Global Aquaculture Alliance’s GOAL shrimp session in Vancouver, British Columbia, Canada (October 2015), a panel of shrimp experts talked about the microsporidian Enterocytozoon hepatopenaei, a spore-forming fungal parasite, and how it might affect the global shrimp supply.  John Sackton, Editor and Publisher at Seafood.com (an online, subscription-based, fisheries news service) prepared the following report based on interviews with a number of the shrimp experts, who spoke on the condition that they would not be quoted by name. When [...]

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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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Role of Vitamin C & Multivitamin Diets for Enhacement of Immunity, Growth & Biological Performance in Shrimps/Fish

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Good nutrition in aquaculture systems is essential to economically produce a healthy and high quality product, writes Mr Prakash Chandra Behera, Technical Manager (Aqua Division), PVS Group, India. Vitamins are essential nutrients found in foods. They perform specific and vital functions in a variety of body systems and these are crucial for maintaining optimal health. Vitamins are a heterogeneous group of organic compounds essential for the growth and maintenance of aquatic animal life. The majority of vitamins are not synthesized [...]

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Aquaculture Feed Composition Helps Define Potential For Water Pollution

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Summary: A study found that feed for salmon and trout had higher organic carbon concentrations than did catfish, shrimp and tilapia feeds. Nitrogen and phosphorus concentrations were similar among salmon, trout and shrimp feeds, and higher than those in catfish and tilapia feeds. Whole body concentrations of organic carbon were greater in salmon and trout than in the other species. Salmon and shrimp had the highest whole body nitrogen concentrations. Phosphorus concentrations were greater in catfish and tilapia than [...]

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Feeding Trays: Advantages and Disadvantages

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Feeding trays are typically used to avoid overfeeding in aquaculture production systems.  They are sometimes used to deliver 100% of the feed and other times to evaluate broadcast feeding efficiency with a small number of trays.  They are credited with reducing feed cost per unit of production, but there is seldom mention of their effects on overall crop profitability. Advantages of Feeding Trays • Reduced feed-conversion ratios. • Reduced feed costs. • Improved growth, frequently. • Improved water quality, which supports increased stocking density, [...]

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Escape from EMS/AHPND at SGIC

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How this is achieved is through management of culture systems, biosecurity, avoiding use of chlorine for pond and reservoir water disinfection and thorough clean-up of hatchery. Dr Boonsirm Withyachumnarnkul at Centex Shrimp, Mahidol University said that with widespread destruction of crops with early mortality syndrome (EMS) in vannamei shrimp farming, some farms in Thailand have returned to farming the black tiger shrimp in 2013. The Shrimp Genetic Improvement Center (SGIC), Surat Thani, Thailand has largely escaped being infected with the bacteria causing [...]

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Recirculating Aquaculture Technology – Part I. Starting Biofilters

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Summary: Biological filtration is one of the critical required unit processes in recirculating aquaculture systems. Non-corrosive filter media with large amounts of surface provides area for nitrifying bacteria cells to colonize. “Starting” a biofilter means managing the seeding of bacteria on the media. Bacteria can be introduced with water or biofilter media from an active system, with sediment from a pond or with small numbers of “starter” animals. Commercial bacterial cultures, which shorten the starting process, are essential for [...]

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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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