Dr. Andreas Mäck is quite certain: aquacultures in land-based recirculating systems are among the fish farming methods of the future. However, the managing director of Fresh Völklingen GmbH from Saarland is also convinced that the economic success of this breeding method requires special conceptual and technical efforts. Rupert Baur, who has been breeding white tiger shrimp in a recirculating system at his company HanseGarnelen in Grevesmühlen (Mecklenburg-Western Pomerania) since 2020 and is now setting up a second operation in Glückstadt (Schleswig-Holstein) that also operates sustainably, takes a similar view.


Fish farm products from sustainably operated recirculating systems are very popular with both commercial and private buyers, Mäck knows from his own experience: “Customers are aware of the benefits for animal welfare, for the quality of the products and for the environment.” Equipped with the right water treatment and filtration technology, such systems manage with an extremely low fresh water requirement. The animals bred in the closed and covered systems are free of introduced parasites and diseases: “No addition of antibiotics or other agents is required,” explains Mäck.


How the advantages of sustainable recirculating systems and pond farms can be exploited in everyday operations and how the products can be successfully marketed are among the key aquaculture topics discussed at the forum of fish international, the only fish trade fair in Germany. As convinced as Mäck is of the long-term success of closed-loop plants, however, he is also aware of the challenges that still need to be overcome: “In terms of business management, there are currently too few examples of successful plants.” The recirculation operation and the technology required for it cause high operating costs, which is one of the biggest economic problems with recirculation plants.

For his company, Mäck is relying on a concept that could be the way out: At the facility in Saarland, he breeds yellowtail kingfish, which are otherwise mostly imported as frozen wild catch from waters south of the equator. “Our product comes to the customer fresh and in top quality, so we can achieve higher prices than for mass-produced or frozen goods,” says Mäck.


As founder and owner of HanseGarnelen, Rupert Baur follows similar sustainability principles in shrimp farming as Mäck. Baur already played out a special advantage in his first circulation plant in Grevesmühlen: The graduate mechanical engineer developed the circulation system for his breeding operation himself. “The plant’s water is not moved by electric pumps, but by a blower,” Baur explains. The recirculating system water, specially mixed from clean water and seawater minerals, is biologically and mechanically purified by a three-stage filter, also developed in-house. Like Fresh Völklingen, HanseGarnelen does not use antibiotics or other additives. This is even excluded per se, because it would also destroy the biology of the water treatment.

For the new plant project in Glückstadt, Schleswig-Holstein, Baur has further expanded its sustainability concept already successfully applied in Grevesmühlen. In Mecklenburg-Western Pomerania, he uses waste heat from a neighboring plant to heat the hall in which the recirculating unit operates. In Glückstadt, it will cover the energy requirements of the circulation system from the warm production water of a neighboring paper mill. “This is doubly sustainable, because otherwise this hot water would first have to be cooled using additional energy and would still have heated up the environment or the Elbe River unused,” explains the company boss.

In their fields, both Fresh Völklingen and HanseGarnelen are thus pioneers of a future-oriented development in the fish industry. The two entrepreneurs are convinced: without land-based recirculating systems, the protein needs of the growing world population cannot be met in the long term.


Das Messeteam der
fish international
erreichen Sie unter:

Für technische Anfragen:

Schreiben Sie uns!

Wir verarbeiten Ihre Daten auf Grundlage von Art. 6 Abs. 1 S. 1 lit. f DSGVO, um Ihre Anfrage zu beantworten. Darüber hinaus können Sie selbst entscheiden, ob Sie uns weitere Angaben mitteilen möchten. Diese Angaben erfolgen freiwillig und sind für die Kontaktaufnahme nicht zwingend erforderlich. Ihre freiwilligen Angaben verarbeiten wir auf Grundlage Ihrer Einwilligung.

Ihre Daten werden nur zur Beantwortung Ihrer Anfrage verarbeitet. Wir löschen Ihre Daten, sofern diese nicht mehr erforderlich sind und keine gesetzlichen Aufbewahrungspflichten entgegenstehen. Soweit Ihre, per Kontaktformular übermittelten Daten, auf Grundlage von Art. 6 Abs. 1 S. 1 lit. f DSGVO verarbeitet werden, können Sie der Verarbeitung jederzeit widersprechen. Zudem können Sie Ihre Einwilligung in die Verarbeitung der freiwilligen Angaben jederzeit widerrufen. Wenden Sie sich hierfür bitte an die im Impressum genannte E-Mail-Adresse.

Unsere Informationen zum Datenschutz nach Art. 13 und Art. 14 der Datenschutzgrundverordnung können Sie unter einsehen oder unter der Telefonnummer +49 421 3505-0 beziehungsweise über anfordern.



The trade fair team of the
fish international
you can contact at:

For technical inquiries:

Write to us!

You may contact us third-party via our contact form. In order to use our contact form, we will require you to provide the data marked as mandatory. The legal basis for this processing is Art. 6 (1) (f) GDPR, being our legitimate interest to respond to your request. You can decide whether or not you would like to provide us with further information. This information is provided voluntarily and is not required to contact us. We process your voluntary details on the basis of your consent in accordance with Art. 6 (1) (a) GDPR.

Your data will only be processed to process your request. We will delete your data if they are no longer required and there are no legal obligations to retain them. Where the processing of your data which is transmitted via the contact form is based on legitimate interest in accordance with Art. 6 The legal basis for this processing is Art. 6 GDPR, you have the right to object to that processing at any time. To do so, please use the email address provided in the imprint. In addition, you can withdraw your consent to the processing of your voluntarily provided information at any time. To do so, please use the email address provided in the imprint.

Our information on data protection in accordance with art. 13 and art. 14 of the EU General Data Protection Regulation has been attached here, you can view it under or request it by calling +49 421 3505-0 or via


Skip to content