A type of mollusk, known as the Pacific oyster, has been increasingly found along the coasts of France, especially in the region of Brittany. These oysters, originally from the Pacific Ocean, have become more common in French waters in recent years due to both natural spread and human activity. Their presence has raised interest among scientists and local communities, as they play a role in marine ecosystems and have potential economic value. The spread of these oysters has been supported by the movement of larvae through ocean currents and human-assisted transfers, often for aquaculture purposes. In Brittany, local authorities and researchers are monitoring their expansion to understand the ecological impact and to manage any potential challenges they may bring to native species. In addition to their growing presence in French waters, these oysters are increasingly being transported commercially to Spain. This trade is part of a broader seafood market that connects European countries, with Spain being a significant importer of various shellfish. The increase in commercial flows suggests that the Pacific oyster is becoming more integrated into the European seafood economy. The movement of these mollusks between countries highlights the interconnectedness of marine ecosystems and global trade. As their populations grow and spread, continued monitoring and research will be essential to ensure that their presence benefits both the environment and local economies without causing unintended harm.