Birkenhof pond
The pond estate Birkenhof along the Ismaninger reservoir east of Munich was the largest wastewater fish pond in Europe. Fish farming was stopped in 2000. Because of its European importance as a moulting, resting and wintering area for water birds, the former pond property together with the reservoir form the EU bird sanctuary "Ismaninger reservoir and fish ponds".
history
The estate was in the years 1926 to 1929 by the middle Isar AG built and covered a total area of 340 hectares of pond area of 233 hectares. It had 30 wax ponds with 4.8 to 7.5 hectares each, 15 winter ponds with a total of 3.5 hectares and 53 rearing ponds with a total of 13 hectares. The facility was stocked with around 100,000 two-summer carp each year , which had a total weight of around 75 tons. The annual harvest was around 200 tons.
The fish ponds were used by the Gut Großlappen sewage treatment plant in Munich, which was built in 1926, as receiving waters for secondary treatment of the wastewater. At the same time, the nutrient content, which was converted into microflora , microfauna and small crustaceans , made it unnecessary to feed the fish. From the mid-1990s, the nutrient content of the wastewater declined because the sewage treatment plant used improved purification processes. This made fish farming unprofitable and stopped in 2000. In 2002 the pond was leased by the Bavarian Nature Conservation Fund. E.ON AG continues to own the land, succeeding Mittlere Isar AG and Bayernwerk AG.
The pond property had its own field railway with a length of around 30 kilometers (gauge 60 centimeters), which was used for structural maintenance and the transport of fish. The last tracks were dismantled in 2011. The farm buildings of the former estate are located on Bundesstrasse 471 between Ismaning and Aschheim .
investment
The fish ponds stretch around 400 meters wide over a length of around 7.5 kilometers south of the Middle Isar Canal through the communities of Unterföhring , Aschheim , Kirchheim near Munich and Pliening . To the south of the fish ponds runs a feed channel branched off from the Mittlere-Isar-Kanal, which serves to supply the ponds with water. Waste water from the Gut Großlappen sewage treatment plant is pumped into it via a pressure pipe bridge. To the north of the fish ponds, a drainage channel runs between them and the Mittlere-Isar-Kanal, through which the water is drained from the fishponds.
Web links
Individual evidence
- ↑ District Office Munich: Ismaning reservoir with fish ponds ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
- ↑ State Association for Bird Protection: Ismaninger reservoir - development of the area , accessed on August 11, 2013
- ↑ Entlang-der-gleise.de: The economic field railway of the Birkenhof pond near Ismaning , accessed on August 11, 2013
Coordinates: 48 ° 12 ′ 10.5 ″ N , 11 ° 41 ′ 59.3 ″ E