Shrimp from Rheinfelden
SwissShrimp AG, based in Rheinfelden, Switzerland, is the largest producer of shrimp in Europe. Michael Siragusa, a chemist and Technical Operations Manager, introduced us to the company during a visit and explained why a fully automatic IC system from Metrohm plays the main role in monitoring water quality in the breeding pools.
SwissShrimp, which are locally grown without antibiotics, shown in the packaging available in some grocery stores in Switzerland.
An ideal location
Shrimp farms are usually associated with tropical fields, especially in Southeast Asia. Often, one also thinks of the dubious reputation these farms have due to their large ecological footprint. The SwissShrimp project in Rheinfelden shows that shrimp can also be produced on a large scale in Switzerland without exhausting nature and entirely without the use of antibiotics. According to Plant Manager Michael Siragusa, many individual factors are decisive for the success of the project. One of the most important of these is that SwissShrimp AG, at its Rheinfelden site, can cover a large part of the enormous power requirements for heating the breeding pools, at very favorable conditions, using heat from the nearby Swiss Salinen AG (Swiss Salt Works).
Inconspicuous: SwissShrimp produces its shrimp in this hall located in the middle of a green meadow.
The Swiss saltworks evaporate brine for salt production. Its waste heat supplies a large part of the energy for heating SwissShrimpʹs breeding pools.
Large technical effort
There is a tropical climate in the companyʹs large, inconspicuous hall: Shrimp of the species Litopenaeus vannamei (Pacific white shrimp) are raised in a total of 16 pools, each measuring 40 x 5 x 0.50 meters, on two floors. At a constant water temperature of 28 degrees Celsius, these pools each have up to 200,000 shrimp, with the animals in one pool all at roughly the same stage of development. SwissShrimp sources the larvae from special, certified breeders in Europe or the USA. It takes around six months before shrimp of up to 14 cm in length have developed from tiny larvae, which are barely two millimeters in size.
Densely stocked: Each of the 16 pools holds up to 200,000 shrimp.
Until the shrimp grow to full size, they are fed automatically with a special, organic dry feed. The grain size and composition of this feed varies depending on the stage of development. The dense stocking of the pools means that cleaning the water requires a great deal of effort. In a total of eight water circuits, the entire volume in the breeding pools is cleaned mechanically, biologically, and chemically 20 times a day using the latest filter technology; three percent of this volume is replaced daily.
Waste recycling: The feed for the shrimp is mainly made from fish waste. The composition and grain size is precisely matched to the different development stages of the shrimp.
An IC system from Metrohm controls the water quality
«Water treatment is essential for us. We purify the water in our pools about 20 times per day.
In order to allow the shrimp to grow and keep the biological equilibrium of the plant, we have to keep a close eye on the toxic parameters… ammonium, nitrite, and nitrate.
If we performed this monitoring by an alternative method…, the 10 to 20 determinations would take the whole day, every day.»
When it comes to monitoring the water quality in the breeding pools, a fully automated IC system from Metrohm comes into play: In the SwissShrimp company laboratory, the water of each of the 8 water circuits is examined daily for concentrations of toxic pollutants such as nitrite, nitrate, and ammonium, which are introduced into the water by the excretions of the shrimp.
Download our free Application Notes below to learn more about ion chromatography and the analysis of nitrite, nitrate, and phosphate in seawater from a shrimp farm.
In the company laboratory: The water quality is monitored fully automatically with a 930 Compact IC Flex, 940 Professional IC Vario, and 858 Professional Sample Processor. In order for the shrimp to thrive, it is important to detect any deteriorations in water quality at an early stage so that corrective measures can be initiated in good time. Altogether, around 2000 multi-parameter analyses are carried out annually at this measuring station.
On the other hand, saltwater parameters important for the shrimp to thrive are measured. These include chloride, sodium, magnesium, calcium, and potassium. Given the sheer number of parameters that need to be monitored, the advantage of ion chromatography comes into effect: IC is a multi-parameter method, i.e. several different parameters can be determined with a single measurement. In addition, not only does the analysis run automatically, but sample preparation with the inline ultrafiltration and dilution steps is also integrated into this process. In fact, SwissShrimp does not need a full laboratory assistant position thanks to Metrohmʹs automated analysis system.
In the profit zone starting this year
The operation in Rheinfelden did not begin until 2018, and SwissShrimp is not yet operating profitably. However, production is expected to increase to 60 tons annually by the end of 2021. This is when the project, costing 25 million francs, would generate a profit for the first time. The company is currently investing in marketing in order to achieve this goal, because it is not yet well known that the best shrimp to be purchased in Switzerland come from Rheinfelden.
No frozen goods
Shrimp from Rheinfelden are a delicacy and are marketed as such, but only in Switzerland so far. Around 70 to 80 kilograms of shrimp currently leave the company every day, delivered only on order. The fresh shrimp are delivered directly to end customers and select markets of the two major Swiss retailers, Migros and Coop, via Priority Mail within 24 hours in special transport boxes specially developed for SwissShrimp with integrated Peltier cooling elements. On-site collection by the customer after ordering is also possible.
Fresh shrimp, grown daily on the northern border of Switzerland.
To learn more about the production of shrimp in Rheinfelden, visit the SwissShrimp website.
Further free Application Notes for the analysis of several ions in seawater via ion chromatography can be found on the Metrohm website.
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Post written by Roman Moser, Senior Editor and Dr. Alyson Lanciki, Scientific Editor at Metrohm International Headquarters, Herisau, Switzerland.