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Degradation of natural ecosystems

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Decline in spatial quality

Decline in spatial quality due to a high number of civil constructions.

Worldwide, the development of waterfront cities has often resulted in the degradation of natural ecosystems. This leads to a decline in water quality and health of aquatic communities. Coastal fish nurseries, areas of refuge and food sources, have been lost, limiting the availability of the necessary resources for aquatic organisms to flourish.


The Biohut: an artificial fish nursery

The Biohut is an artificial fish nursery meant to equip port infrastructures such as docks, pontoons or dikes. By providing food and shelter to the young fish, this micro-habitat enables them to survive and grow through their most vulnerable lifestage, up to a size where they are ready to join adult population.

The Biohut reproduces the nursery function by a simple two-cages system: the inside cage is filled with empty oyster shells where a lot of algae and tiny crustaceans can to attach, providing food for small fish. The two empty cages around it protect the small fish from bigger fish as the mesh size only allow small fish to enter the Biohut.


  • The process has been validated scientifically through several research projects.
  • Small and flexible, the Biohut can easily adapt to all locations. More than 1000 have already been installed worldwide.
  • Beside its ecological benefits, the Biohut is a good tool to raise public awareness on marine biodiversity.


  1. Topic Water quality
  2. Development state 9: Successfully used in operational situation
  3. Setting type Coastal area, Urban area
  4. Water type Sea water, Navigable water
  5. Project period 1-3 years