Could this humble sea sponge clean up the world’s ports?

The chicken liver sponge has sailed through a test of its ability to filter pollutants in a harbour in Spain’s Costa Brava

In the polluted waters of Marina Palamós on Spain’s Costa Brava, Manuel Maldonado, a sponge biologist, noticed something unusual last month: red starfish had started settling in the area.

Nearly two years earlier, the Spanish National Research Council scientist and his colleagues had begun transplanting sea sponges into the port to study whether they could survive in its polluted waters.