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April 22, 2016


Förde-Garnelen (Fjord-Shrimp) Growing Shrimp Next to Sewage Plant




Förde-Garnelen (Fjord-Shrimp) has set up a shrimp farm right next to a sewage treatment plant.  The choice may sound counter-intuitive: Sewage and shrimp aren’t exactly the most mouth-watering combination.  But the facility’s location is actually a stroke of genius.  The sewage plant, it turns out, is a fantastic source of clean water.  It is also an ideal place to dispose of shrimp wastes, which can simultaneously be used to generate heat that the little critters need to thrive.  The conditions, in other words, are nearly perfect.


Seafood lovers might be disappointed to find they can’t actually buy any shrimp at Förde-Garnelen because it is still experimenting with rather than selling its product: Litopenaeus vannamei, also known as whiteleg shrimp or Pacific white shrimp.


Outside, the facility is encircled by cold winds.  But inside, it’s a hot and steamy 30° Celsius (86°F), with humidity at 90%.  Nursery tanks are at a higher level than the growout tanks so that they can be drained directly into the growout tanks.  Company general managers Stefan Paasch (pictured above) and Bert Wecker say that this system allows them to avoid manually transferring the shrimp.  The growout tanks have nets around them to prevent the prawns from jumping out.


Some tanks contain several lattices arranged horizontally above one another.  These serve as “bedrooms” for the shrimp.  “Prawns have quite strong urges to rest at times and that is when they retreat to the lattices,” says Wecker.  “In the wild they simply lie down on the ocean floor.  But in an aquaculture facility, there simply isn’t enough space for all the prawns to rest on the floor of the pools.  The lattices allow for the...[tanks] to be used at their full capacity.”


Postlarvae arrive in consignments of 500,000 from a shrimp hatchery in Florida, USA.  “We work with seedlings because it would be too expensive and difficult to produce the larvae ourselves,” says Wecker.  Between half and 80% of the seedlings survive, he says, adding...“we believe we can increase the rate.”


Over the course of six months, the shrimp grow from an initial weight of approximately 0.03 grams to 30-35 grams.  That’s when a tiny electrical shock and some very cold water are used to kill the shrimp.


“The shrimp aren’t frozen,” says Wecker.  “We send them in...[insulated] boxes that will enable them to be delivered fresh to any customer within the country within 24 hours.”


Another company, Green Aqua Farming, has established a shrimp farm in Mecklenburg-West Pomerania, Germany.


Information: Stefan Paasch and Bert Wecker, Förde Garnelen, GmbH & Co. KG, Bülker Huk, 24229 Strande, Germany (Phone +49-4349-9149271).


Source:  Farming Florida-Bred Shrimp in a German Sewage Plant.  Gisela Reiners.  April 21, 2016.

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