What is the main issue with introducing non-native species in aquatic environments?

Introducing non-native species into aquatic environments primarily raises concerns because these species often outcompete native species and disrupt existing ecosystems. When non-native species are introduced, they may lack natural predators and can thrive in their new environment, leading to rapid population growth. This competitive advantage allows them to access resources such as food and habitat that native species depend on, which can lead to a decline or even extinction of native species.

Furthermore, the introduction of non-native species can alter the structure and function of ecosystems. This disruption can lead to imbalances in food webs, changes in nutrient cycling, and could ultimately impact the ecosystem services that natural systems provide. Therefore, managing and preventing the introduction of non-native species is crucial for maintaining ecological integrity and biodiversity in aquatic ecosystems.