Quantitative Analysis of Mekong Fish Migration Triggers 17
Methodology 17
Migration and triggers of the 768 Mekong fish species 19
Status of knowledge on migration of fish species 19
Status of knowledge on migration triggers of fish species 19
Classification of factors triggering fish migration 21
Fish families most sensitive to triggers 22
Correlation between migration cues 22
Correlation between triggers of fish migrations 22
iv
Correlation between environmental variables 23
Quantitative relationships between discharge and migrations 24
Overview of migration patterns at Khone Falls 24
Representativeness of the Khone Falls studies 25
Catches, species richness and discharge: global patterns 27
Catches and discharge: detailed patterns 29
Response of 47 fish taxa to discharge 30
5. Conclusions 33
Migration and triggers 33
Discharge, catch and diversity 34
Consequences of flow modifications on fish 35
Dry season flow modifications 35
Rainy season flow modifications 37
Methodological points 37
6. References 39
Annex 1. Life history, migration and triggers of Mekong fish species 49
Annex 2. Response of fish taxa to discharge at Khone Falls 53