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March 2016 Newsletter |
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Doing a Lot with Just a Little (Water) |
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A Cutting Edge Denitrification System for Complete Water Recirculation at a Mexico Fish Hatchery |
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In a typical recirculating aquaculture system, the oxidation of ammonia in the biofilters will cause nitrate to build up to the point of being detrimental to animal health. The general solution to this problem is a water change, but regulations in locations affected by drought now limit the amount of water available. In addition, environmental regulations limit nitrate discharge concentrations under many conditions. Nitrate discharges help control nitrate concentrations in the water, but also remove any salts that have been added to the recirculating system water and any alkalinity added to neutralize the nitrate. Enter the denitrification system. Denitrification is the process of reducing nitrates by converting them into nitrogen gas. Denitrification systems have been in use for several decades, primarily in wastewater treatment, but have not been traditionally used in aquaculture and aquatic filtration systems. The denitrification system currently being developed by Aquaneering uses a specially-designed fluidized bed bioreactor. Like our fluidized bed biofilters, the bioreactor contains media on which bacteria grow. The bioreactor is designed to prevent oxygen from entering (anaerobic), forcing the bacteria to reduce the nitrate to nitrite and then to nitrogen gas. A closed packed column connected to the bioreactor removes the nitrogen produced, without adding oxygen to the water. As some potentially toxic compounds and residual ammonia are often formed as byproduct of this dentrification process, the water will then be treated by a high-performance aerobic fluidized bed biofilter and protein skimmer to control colloidal solids and surfactants. The overall system is tied into a SCADA system for alarming and remote notifications. This particular design is skid mounted for easy installation. The system will be used to process and recycle the high nitrate wastewater for a striped bass hatchery in Ensenada, Mexico. The system will support brood stock and fingerlings for production, which will be released to pens in the Pacific at a certain age and size for grow-out. The unique design is a collaboration between Dallas Weaver, Ph.D., of Scientific Hatcheries, and Mark Francis of Aquaneering. The system will process 60 to 120 tons of water per day, providing nitrate-free return water and eliminating an equal volume of total water demand. The Ensenada hatchery will have recirculating water and zero discharge in an environment with a very limited water supply. The end result: protecting precious resources and supporting fish hatcheries through technological innovation. |
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Aquaneering Denitrification System |
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"Protein Skimmer" |
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Dallas Weaver, Ph.D. and the Aquaneering production team testing the denitrification system |
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Working Together is Success... |
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12th Annual Zebrafish Husbandry Workshop at Aquaculture America 2016 |
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The 12th Annual Zebrafish Husbandry Workshop, in conjunction with the 2016 Aquaculture America Conference, was held in Las Vegas this past February. Attendance at the Workshop matched the previous all-time high and attendee participation surpassed previous years, making this an exciting and informative event. In addition to the Zebrafish Husbandry Association (ZHA) pre-workshop annual meeting and sponsored session, a new topic focus was introduced: a session on regulatory issues organized by Monte Matthews. Matthews not only received 105 completed online questionnaires prior to the workshop (designed to gauge community interest and quantify the most pressing concerns), but there was also spirited participation from the audience during the panel session. Continuing the theme of working to integrate the husbandry and PI communities, the Workshop was honored to feature Dr. Stephen C. Ekker as the Keynote Speaker. Dr. Ekker is Professor of Biochemistry and Molecular Biology and Associate Director of the Clinical and Translational Sciences graduate program at the Mayo Clinic in Rochester, Minnesota, and Editor-in-Chief of the Zebrafish journal with the regular Fish Haus section that focuses on the science of fish husbandry (and currently organizing a Special Issue on Zebrafish Health for 2016). Dr. Ekker and other investigators participated in the Town Hall meeting after the workshop proper, coming up with action items to continue advancing the positive relationship between all members of the zebrafish research community. |
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Dante D'India of Harvard University giving his talk on Improved Long-term Imaging of Embryos with Genetically Encoded a-Bungarotoxin |
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Marc Tye, President of ZHA, presenting Dr. Hugh Hammer of Gadsden State with the Zebrafish Stewardship Award |
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Zebrafish Husbandry Workshop at Aquaculture America 2016 |
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FAQs |
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Why isn't the pH probe calibrating or reading correctly? |
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- Check the glass tip of the electrode. If it is broken, replace the electrode.
- Check for water between the pre-amp and the electrode. If there is water present, dry out the pre-amp and electrode thoroughly.
- Check for loose wires. Make sure all electrical connections are secure.
If you need to order a new pH electrode, visit the Aquaneering Online Store. (If your system has a gray twist-lock electrode, contact Aquaneering to discuss replacement options.) For more FAQs, please visit our FAQs page. |
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Where in the World is Aquaneering? |
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Link |
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March 8 - 11 |
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IAT |
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Northern England |
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Website |
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March 15 - 19 |
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4th European Zebrafish Principal Investigators Meeting (EZPM) |
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Lisbon, Portugal |
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Website |
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June 11 - 14 |
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CALAS 55th Annual Symposium |
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Toronto, Ontario |
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Website |
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June13 - 16 |
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13th FELASA Congress Booth A014 |
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Brussels, Belgium |
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Website |
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