Why is the European green crab invasive?

The European green crab is considered invasive because it was introduced to North America and other regions, where it lacks natural predators. Its rapid reproduction and adaptability allow it to outcompete native species for food and habitat, leading to significant ecological disruption. Additionally, it preys on commercially important shellfish, such as clams and oysters, impacting local fisheries and economies. As a result, the green crab poses a threat to biodiversity and marine ecosystems in invaded areas.