Tag - good bacteria

How does rainfall affect shrimp pond water parameters?

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Problems in shrimp farming usually occur during severe drought or heavy rainfall. Observations confim major losses occur mainly during periods of rainfall. In the last two years, we have had droughts brought about by El Niño. The US Climate Prediction Center and the International Research Institute for Climate and Society have issued an announcement that there is a 60% chance of La Niña developing in the last quarter of 2016. In contrast to El Niño, with La Niña we will [...]


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 [...]


How can you control Vibrio bacteria?

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After Dr. Lightner confirmed its virulence using Koch’s postulate, it was found that some strains of Vibrio parahaemolyticus that is the cause of EMS in Asia. Most recently it has also been found to cause EMS in Mexico, which is far away from Asia. It is possible that someone brought brooder shrimp from an Asian country where EMS is prevalent into Mexico for breeding purposes and the weak postlarvae got EMS, or perhaps they used very fast-growing breeding stock [...]


“Black spot” on shrimp

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Regulations prohibit the use of many chemicals and antibiotics in U.S. shrimp aquaculture. The FDA in Silver Spring, MD publishes a list of drugs approved for aquaculture, USFDA URL: http://www.fda.gov/AnimalVeterinary/DevelopmentApprovalProcess/Aquaculture/ucm132954.htm. The main commercial operations in the U.S. claim that they use chemicals and antibiotics responsibly and only when necessary. Although unsubstantiated, this claim is reinforced by limited or no disease occurrences in recent history in the U.S., negating the need for chemical use. Agricultural lime is used to control algal blooms [...]


Dietary supplements of aquatic animals

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An important key to culture of any fed species is the development of sustainable, cost-effective and nutritionally complete feeds, along with efficient feed management systems. Emerging technologies for improving the gut environment are being rigorously studied and are beginning to be applied in aquaculture feeds. Use of probiotics in feeds, although successful in human and animal nutrition, is not well accepted in aquaculture. Improved delivery methods and better understanding of gut microflora of aquatic animals could change this in the future (Balcázar et [...]


Biosecurity in Shrimp Farming

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Biosecurity, as it is being applied to shrimp aquaculture, may be defined as the practice of exclusion of specific pathogens from cultured aquatic stocks in broodstock facilities, hatcheries, and farms, or from entire regions or countries for the purpose of disease prevention (Lightner 2003). Lightner (2003), discussed ways of excluding pathogens from stock (i.e., post larvae and broodstock), especially through the use of quarantine and specific pathogen-free (SPF) certified stocks, and restricting imports of live and frozen shrimp. Excluding vectors and external sources of contamination and [...]


Use of Probiotics in Aquaculture

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The growth of aquaculture as an industry has accelerated over the past decades; this has resulted in environmental damages and low productivity of various crops. The need for increased disease resistance, growth of aquatic organisms, and feed efficiency has brought about the use of probiotics in aquaculture practices. The first application of probiotics occurred in 1986, to test their ability to increase growth of hydrobionts (organisms that live in water). Later, probiotics were used to improve water quality and control of bacterial infections. Nowadays, there [...]


Probiotics as Antiviral Agents in Shrimp Aquaculture

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Shrimp farming is an aquaculture business for the cultivation of marine shrimps or prawns for human consumption and is now considered as a major economic and food production sector as it is an increasingly important source of protein available for human consumption. Intensification of shrimp farming had led to the development of a number of diseases, which resulted in the excessive use of antimicrobial agents, which is finally responsible for many adverse effects. Currently, probiotics are chosen as the best alternatives [...]


Hepatopancreas Colors Related To Vibrios Predict Survival Of Shrimp To EMS

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Monitoring of Vibrio bacteria in shrimp larvae determined a relationship among hepatopancreas color, bacteria concentration and signs of early mortality syndrome. Shrimp with brown hepatopancreases had 3.50 x 103 CFU/g Vibrio with no EMS and high survival. Shrimp with white hepatopancreases had 6.02 x 107 CFU/g Vibrio and died within 10 days. Some animals with both brown and white hepatopancreas tissue had low bacterial concentrations, but survival depended on pond conditions. Management procedures used after the onset of mortality increased survival. Outbreaks of [...]


Probiotic (Bacillus coagulans) cells in the diet benefit the white shrimp Litopenaeus vannamei

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We evaluated the effects of the dead probiotic Bacillus coagulans as a diet additive on growth performance, survival rate, digestive enzymes, and meat quality of the white shrimp Litopenaeus vannamei. Two treatment groups (T-1 and T-2) and a control group, each with 3 replicates, were established. The shrimp in the control were fed a basal diet, and those in T-1 and T-2 were fed with a basal diet containing viable and dead probiotic cells, respectively. After 50 days of culture, the addition of the probiotic [...]