Researchers have studied evolution in the introduction of invasive freshwater species in Galicia over the past century. The study shows that over the past century, 31 exotic species have become established in this region. Some of the most significant invasive species are the red swamp crayfish (
Procambarus clarkii), the mosquitofish (
Gambusia holbrooki), the Asian clam (
Corbicula fluminea), the water hyacinth (
Echhornia crassipes) and aquatic plants. According to the study, data shows that 1995 was a turning point, after the approval of the Schengen Treaty was approved opening the borders of European countries to the free movement of people and goods.
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