As part of the ClanSea project, we are working with our partners to develop a modular barrier concept to prevent the expansion of the Chinese mitten crab (Eriocheir sinensis) and protect native waters and their natural biodiversity.

The results of this project will enable affected coastal regions, their water authorities, and nature conservation actors to prevent the early invasion of the invasive Chinese mitten crab (Eriocheir sinensis) into river and ditch systems. By specifically blocking the migration of juvenile animals, the barrier concept makes an important contribution to the long-term protection of sensitive freshwater and coastal ecosystems and to the conservation of biological diversity.

As part of the project, a modular stainless-steel barrier is being developed that can be integrated directly into coastal weir structures and adapted to the prevailing currents and sediment conditions. The barrier is deployed during the migration period of the juvenile crabs, minimizing potential impacts on native species and problems caused by biofouling.

An integrated camera system monitors the effectiveness of the barrier and possible side effects on other organisms. The data obtained as part of the ClanSea project will be incorporated into a European strategy to combat the expansion of the Chinese mitten crab in waters

Project phases:

• Project preparation: Selection of a test location
• Barrier development: Design and construction of a cost-effective, modular barrier that can be adapted to different locations, withstands the prevailing environmental conditions, and enables continuous monitoring of functionality and effectiveness through an integrated camera system.
• Testing and optimization of the barrier: Four-month test phase of the barrier. At the same time, the recorded image material is analyzed to collect data on efficiency, impact on native aquatic life, and structural stability of the trap.
• Publication of project results and development of an implementation concept