An analysis of the factors that trigger migrations shows (Figure 3) that 80% of species for
which migration cues are documented respond to a variation in water level. This variation
can be either when the water is rising (e.g. Pangasius krempfi) or when it is receding
(Pangasius polyuranodon in northern Cambodia), or in both cases (Pangasius larnaudii,
P. pleurotaenia, most white fishes migrating temporarily into floodplains).