Migration takes place on time scales ranging from daily to annual, and with distances ranging from a few meters to thousands of kilometres. The purpose of migration usually relates to either feeding or breeding. In some cases the reason for migration is still unknown.
Types of MigrationFish that migrate between salt and fresh water are defined as 'diadromous fish'. These include the anadromous species, migrating from the sea to fresh water for spawning, and the catadromous species, spawning in the sea and migrating towards freshwater as a juvenile. Species such as salmon, sturgeon, lampreys and various Cyprinids all have anadromous migration patterns, while Eels have catadromous migratio
Types of MigrationFish that migrate between salt and fresh water are defined as 'diadromous fish'. These include the anadromous species, migrating from the sea to fresh water for spawning, and the catadromous species, spawning in the sea and migrating towards freshwater as a juvenile. Species such as salmon, sturgeon, lampreys and various Cyprinids all have anadromous migration patterns, while Eels have catadromous migratio