pirABvp-Bearing Vibrio parahaemolyticus and Vibrio campbellii Pathogens Isolated from the Same AHPND-Affected Pond Possess Highly Similar Pathogenic Plasmids

: 7366

Abstract: Acute hepatopancreatic necrosis disease (AHPND) is a severe shrimp disease originally shown to be caused by virulent strains of Vibrio parahaemolyticus (VPAHPND).  Rare cases of AHPND caused by Vibrio species other than V. parahaemolyticus have been reported.  Here we compare an AHPND-causing V. campbellii (VCAHPND) and a VPAHPND isolate from the same AHPND-affected pond.  Both strains are positive for the virulence gene pirABvp.  Immersion challenge test with Litopenaeus vannamei indicated the two strains possessed similar pathogenicity.  Complete genome comparison showed that the pirABvp-bearing plasmids in the [...]


Use of formic acid to control Vibriosis in shrimp aquaculture

: 7821

Abstract Luminous Vibriosis is a shrimp disease that causes major economic losses in shrimp industry as a result of massive shrimp kills due to bacterial infection caused by Vibrio species. Use of antibiotics to control Vibrio in shrimp aquaculture is not allowed in the United States and so it is necessary to develop an alternative pathogen control method for shrimp production. Short-chain fatty acids have been used as food preservatives for a long time. Organic acids are commonly added in feeds in animal production, [...]


Importance of Feed Enzymes for Shrimp and Fish in Sustainable Aquaculture

: 10295

Feeding enzymes to shrimps and fishes is one of the major nutritional advances in the aquaculture sector since last few years. Exogenous enzymes are now extensively used throughout the world as additives in animal diets. Also, supplementation with enzymes can help to eliminate the effects of antinutritional factors and improve the utilization of dietary energy and amino acids, resulting in improved performance of fish/shrimps (Farhangi and Carter, 2007; Lin et al., 2007; Soltan, 2009). The primary purpose of enzyme application [...]


The oft-overlooked water quality parameter: pH

: 11024

Farmers are aware of the importance of monitoring levels of dissolved oxygen in their production systems and of providing supplemental aeration in intensive fish and shrimp ponds. However, other water quality parameters – as simple as they may look – are often overlooked. One such parameter is pH, which in chemistry refers to a numeric scale used to specify the acid or alkaline condition of an aqueous solutions. In a practical sense, water pH may range from 0 to 14 [...]


High-density shrimp producer wins innovation award

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The Global Aquaculture Alliance (GAA) will recognize a farmed shrimp producer in Brazil as a leader in innovation. Camanor’s high-density, land-based facility recycles water for multiple production cycles while preventing environmental degradation and the use of chemicals or antibiotics. At GAA’s annual GOAL conference in Vancouver next week, Camanor Produtos Marinhos Ltda. Director Werner Jost will accept the Preferred Freezer Services Global Aquaculture Innovation & Leadership Award for AquaScience®, what he calls a “new concept in sustainable shrimp production” operating [...]


Dietary organic acids used as growth promoters anti-microbials

: 6063

Disease is a major limiting factor to aquaculture expansion and productivity. Of particular concern to tilapia aquaculture are bacterial diseases caused by the Streptococcal groups, such as Streptococcus agalactiae, which can cause widespread mortalities, particularly in warm water and high intensive culture systems in various countrieS. Antibiotics such as oxytetracycline (OTC) are still being used as the most common treatment and/or prophylactic against bacterial diseases, including Streptococcus, in many sectors of the aquaculture industry. However, as the global trend in antibiotic use becomes [...]


Testing an intensive shrimp hatchery system using biofloc technology

: 8463

The hatchery phase is a critical and complex first step in the commercial farming of Pacific white shrimp, and constant attention is required to produce shrimp postlarvae of the best quality possible. The use of biofloc technology (BFT) is increasing in the aquaculture of many commercially-important aquatic species. BFT is used to intensify production and to minimize or prevent the exchange of culture water, with a consequent reduction in potential pathogens and the discharge of nutrient-rich effluents into the environment. The [...]


Shrimp farming experience: Disease prevention or treatment?

: 6708

Shrimp is a lower animal without specific immune system. Thus, its ability to resist pathogens is poor. There is currently no vaccine for disease prevention in shrimp. Weak shrimp is easily susceptible to virus (e.g., white spot, Taura syndrome) and bacteria (e.g., Vibrio). If shrimp has serious disease, farmers have to not only deal with reduced yield, even face lost, but also pay for the expensive cost of pond treatment. Shrimp body temperature varies based on temperature of the surrounding [...]


CIBA’s new eco-friendly ‘Biofloc’ technology for shrimp farmers

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CHENNAI: To help India retain its market share in global shrimp export and neutralise disease threat, Central Institute of Brackishwater Aquaculture (CIBA) is popularising ‘Biofloc’ technology, which is eco-friendly and sustainable. CIBA scientists say commercial interest in biofloc technology is threefold. It provides high productivity, low feed-conversion ratios (FCRs) and a stable culture environment. Also, with emerging bacterial and viral problems coupled with rising costs for energy, biofloc appears to be an answer for sustainable production at lower cost. Marking a [...]


Hepatopancreatitis in prawns, Australia

: 3739

Mortalities of farmed Penaeus monodon have been observed in some ponds at several farm sites. An event in late 2015 did not meet requirements for immediate notification; however, a January 2016 event does, and both events are reported here. Affected animals range from 35 to 95 days post stocking. Mortality rates have varied from negligible to approximately 90%. Hepatopancreatitis has been associated with populations of affected shrimp. The histopathology of the hepatopancreas in affected animals is consistent with that [...]