Migration And Spatial Behaviour: Introduction. The Stimulus And Capacity For Migration: Stimuli For Migration, The Capacity For Migration, Piloting, Orientation And Navigation. Types Of Migration: Migrations At The Seasonal And Ontogenetic Scale, Diel Horizontal And Vertical Migrations. Patterns Of Migratory Behaviour In Freshwater Fishes: Arctic And Subarctic Regions, Temperate Regions, Tropical Regions. Taxonomic Analysis Of Migration In Freshwater Fishes, Lampreys Through To Freshwater--Dwelling Flatfishes (In 45 Sections). Methods For Studying The Spatial Behaviour Of Fishes In Fresh--And Brackish Water: Capture Dependent Methods, Capture Independent Methods, Choice Of Methods In Fish Migration Studies. Applied Aspects Of Freshwater Fish Migration: The Impact Of Mana s Activities On Freshwater Fish Migration. Mitigation Of Hazards And Obstacles To Fish Migration, Installation, Monitoring And Efficiency Of Fish Passes. Conclusions. Indexes