A regional environmental officer shows a blue crab (Callinectes sapidus), which will be analyzed, measured and weighed at the laboratory of the Mediterranean Institute of Oceanography (MIO) of Marseille, in Hyeres, southeastern France on May 28, 2026. A "super predator" and "super breeder," nothing seems able to stop the blue crab which, having come from America, is threatening the ecosystems of the French Mediterranean, with only one way so far to limit its spread: eating it. (Photo by MIGUEL MEDINA / AFP via Getty Images)