The re-introduction of Unio crassus in streams where this mussel species has become extinct is a very important part of the UCforLIFE project. Therefore, fish cages have been placed in the streams in Fyledalen and in Klingavälsån next to Hemmerstorps mölla during the last two weeks. Then, on a calm and rainy Saturday afternoon, Kristin and I run a fish infestation directly in Fyledalen, and in Klingavälsån the following Monday. Prior to this, gravid mussels were collected in Tommarpsån and Bråån, two streams holding a great mussel population and transported to the lab. After the glochidia have been released by those adult mussels we collected their larvae, transported them to the streams, caught fish by means of e-fishing and finally, infested those fish with mussel larvae in a big tank. Afterwards, the fish were placed in the prepared fish cages.
In order to re-introduce juvenile mussels in the streams, the fish enclosed, will be fed regularly and only taken off the cages after a couple of weeks.
More information about this re-introduction measure you can find on the following sheet, which is also fixed next to the cages in the field.