What is Fish migration?
[[File:Schlatbach Fischtreppe.JPG|thumb|A [[fish ladder]] on a river in Germany, to help with migration.]] [[File:Jumping_Salmon.jpg|right|thumb|Many species of [[salmon]] are anadromous and can migrate long distances up rivers to [[Spawn (biology)|spawn]]]] [[File:Fish_Migration.webm|thumb|290x290px|Allowing fish and other migratory animals to travel the rivers can help maintain healthy fish populations]] Many species of [[fish]] move from one [[body of water]] to another. Many fish do this on a regular basis. If it is done by many fish, it is usually called '''fish migration'''. The timespans and distances vary. Some migrations occur everyday, others take months or years. Some migrations are seasonal. Sometimes fish move within the same body of water. They may spend the day near the surface and move to deeper sections at night, for example. == Forms of migration == Common forms of migration''':''' * ''anadromous migration'': The adult fish live in the [[sea]], they migrate up a river to [[Spawn (biology)|spawn]]. The young fish will then migrate back to the sea. [[Salmon]] species are examples of such migrants * ''catadromous migration'': The adult fish live in a river or lake, they will migrate to the sea to spawn. Some [[eel]] species fall into this category * diadromous migration: term used to include both therms above. * ''amphidromous migration'': Fish that live in or near the [[Estuary|estuaries]] of rivers, and regularly change between the river, its estuary and the sea. Examples for this are certain species of [[flounder]]. == Reasons for migration == Common reasons for migrations include that they find more [[food]] at the other place, or that they move there to spawn. In some cases, the reasons for the migration are unknown. == Related pages == *[[Lessepsian migration]] - Animals migrating through a man-made canal, such as the [[Suez Canal]] or [[Panama Canal]].{{Stub}} [[Category:Fish]]