Glossary

anadromous: describes a fish that mostly lives in saltwater but swims up freshwater rivers to spawn

catadromous: describes a fish that mostly lives in freshwater but migrates to saltwater to spawn

diadromous: describes a fish that migrates between freshwater and saltwater

head of tide: the upstream limit on a river affected by tidal fluctuations

hydroelectric energy: a form of renewable energy that uses the movement of water to generate electricity