The fight against cancer plague is showing success: As the regional council of Freiburg (RP) reports, large areas of the Brugga and its side streams in the Dreisamtal between Kirchzarten and Oberried can be released for use again from January 1st. The entry ban issued due to the cancer plague would then only apply to a few areas of the water system. The district office of Breisgau-Hochschwarzwald adjusted its general decree, which came into force for the first time on July 26, 2019. The new rules will initially apply until June 30, 2022.
To contain the crab plague in the Brugga and its tributaries, the RP built a second cancer barrier in the creek in the Kappl district of Neuhäuser last September. Therefore, the entry ban on Brugga will only apply to the area from the Engenwald playground to the confluence with the Dreisam and in the Krebsgraben in the Neuhäuser district, where the cancer plague broke out in 2019. The aim is to prevent the spread of the crayfish plague, which is still effective, in the lower reaches of the stream to essential sections and tributaries located upstream. The entry ban continues to apply in this area to dogs that are not allowed to swim in the Brugga or in its backwaters. Leisure activities and fishing in the water should also be avoided as long as the animal disease is rampant (the restricted area is marked in blue on the overview map in the appendix).
The ban on entering the Zastlerbach and Krummbach and their small tributaries was lifted last June. From January 1st, the upper reaches of the Brugga above the Engenwald playground can be re-entered.
The cancer plague pathogens, which are harmless to humans, endanger the protected and very rare jackdaw cancer. As reported by the RP, the monitoring continued this year shows a noticeable lack of live jackdaw crabs in the lower reaches of the Brugga, where dead jackdaw crabs were still found occasionally. This indicates a latent reservoir of cancer plague in this area, from which there is a very high risk of the disease spreading to essential parts of the Brugga and its tributaries located upstream. However, by draining the connecting waters and building the second cancer barrier, the spread of the crayfish plague to other bodies of water has so far been prevented.
The first cancer barrier in Brugga at the Engenwald playground and the second cancer barrier in the Neuhäuser district follow the recommended double barrier principle: if invasive crabs or the crab plague overcome the first barrier, the second barrier serves as an additional safeguard. The area between the locks is regularly examined as part of cancer monitoring in order to identify possible immigration of invasive cancers or a jump in the cancer plague at an early stage and to be able to take countermeasures if necessary. The jackdaw population above the barriers will also continue to be investigated in order to check the success of the measures to contain the disease
Background information:
The crayfish pathogen that got into the Brugga comes from the invasive crayfish, which, however, has not yet been identified in the Brugga water system. The cancer plague broke out in the Krebsgraben in March 2019 and was introduced into the Brugga. It had spread rapidly in the lower reaches of the water. The RP had taken immediate measures to preserve the threatened cancer population. The Lower Water Authority at the Breisgau-Hochschwarzwald District Office has issued a ban on entering the Brugga and its tributaries.
Crayfish plague is a fatal, highly contagious disease in native crayfish that is triggered by a fungus-like pathogen, Aphanomyces astaci. The stages of transmission of crab plague, known as spores, can be introduced into a body of water by any moist object that has come into contact with contaminated water, such as rubber boots, nets and fish traps, as well as the damp fur of dogs or the plumage of water birds. There is no effective treatment or vaccination against cancer plague. The measures taken on the Brugga are aimed at containing the spread of the disease. The duration of the epidemic cannot be foreseen, as only a few spores in the water are sufficient to cause the cancer plague to flare up again.
(Press information: Freiburg Regional Council, December 30, 2021)
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