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United States

Mississippi—Research, Grow Shrimp at Low Salinities and
Save Money on Salt

 

From Highlights: To create a marine environment at a freshwater location requires a lot of salt, which can get expensive.  In this study, researchers used commercial-scale, biofloc raceways with salinities of 10, 20, and 30 parts per thousand to determine which one was best for shrimp growth.

 

There were no statistically significant differences in shrimp production metrics among treatments, indicating that commercial-scale biofloc systems can perform well at a variety of salinity levels. 

 

Excerpts from Abstract: “The purpose of this project was to examine commercial-scale biofloc shrimp production at three different salinities.  Nine raceways were randomly assigned to three salinity treatments: 10, 20, and 30‰ (low salt, LS;  medium salt, MS; and  high salt, HS), each treatment contained three raceways....  The raceways were operated as heterotrophic biofloc systems, with daily additions of sucrose to raise the carbon:nitrogen ratio.  Temperature, dissolved oxygen, pH, and salinity were all maintained at consistent levels.  Spikes of ammonia and nitrite occurred in all tanks, but nitrate remained low, with a peak value of 8.7 mg NO3-N L− 1.”

 

“Operating at the low salinity of 10‰ reduces salt use by about 50%, compared to the MS treatment, which implies substantial cost savings for production facilities.  This study helps to illustrate the range of salinity options for shrimp production in commercial-scale biofloc systems.”

 

Source: Aquaculture.  Comparing Salinities of 10, 20, and 30‰ in Intensive, Commercial-Scale Biofloc Shrimp(Litopenaeus Vannamei) Production Systems.  Andrew J. Ray (andrew.ray@kysu.edu) and Jeffrey M. Lotz (Division of Coastal Sciences, Gulf Coast Research Laboratory, The University of Southern Mississippi, 703 East Beach Drive, Ocean Springs, Mississippi 39564, USA).  In Press, Accepted Manuscript: Available Online April 8, 2017.

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