Monitoring invasive alien fish at fish corridors
Many fish species undertake more or less extended migrations as part of their basic behaviour. Amongst the best known examples in Europe are salmon (Salmo salar), sturgeon (Acipenser sturio) and eel (Anguilla anguilla), which are diadromous species with their life cycle taking place partly in fresh water and partly in sea water, often swimming several thousands of kilometers to reach their spawning grounds.