Monitoring of artificial reefs in Marseille by the MIO

These artificial reefs are located 200 m from the mouth of the wastewater discharge of the City of Marseille at Cortiou. Sandrine Ruitton and Delphine Thibault, EMBIO team, dived there on Thursday 28/10/21 and they observed a pile of macro-waste at the foot of the reefs, certainly following the heavy rains of last week. In addition to this waste, the surface of the sediments was covered with a whitish film due to bacterial decomposition. The MIO has been carrying out seasonal monitoring of the ichthyofauna and benthic invertebrates of these artificial reefs for the last 4 years.