The blue crab – callinectes sapidus – has been destroying populations of eels, oysters and mussels that are traditionally caught in the lagoons and coastal lakes of the waters of the Canet-Saint-Nazaire lake in southern France.
Native to North American Atlantic waters and brought to the Mediterranean in the ballast waters of commercial ships, the crabs have spread quickly from around 2017, according to the French Office for Biodiversity, which is helping fishermen to control their numbers.
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https://www.reuters.com/world/europe/french-mediterranean-invasive-blue-crab-wreaks-havoc-local-molluscs-2021-08-31/
Reuters