Strong invasion of Mellah lagoon (South-Western Mediterranean) by the American blue crab Callinectes sapidus Rathbun, 1896

Based on our discussions with fishermen and analysis of catches from professional fishing, this work confirms the presence of the American blue crab Callinectes sapidus in the southwest Mediterranean and highlights its invasion of Mellah lagoon in Algeria. The number and frequency of occurrence of this species in fishing gear (up to 10 individuals per fyke net), the presence of juveniles and ovigerous females as well as its presence in the local market, show that it is well established. The possible impact of C. sapidus on the local environment and native species, and the prospects for its fishing exploitation are discussed in the light of the current knowledge.

Automated summary

This study confirms the presence of the American blue crab in the southwest Mediterranean, particularly its invasion of Mellah lagoon in Algeria. The analysis shows that this species is well established in the area, with significant numbers found in fishing gear and local markets. The potential impact on the local environment and native species, as well as the prospects for its fishing exploitation, are discussed in the context of current knowledge.