The invention relates to a migratory fish passage arrangement, to arrange the flow of waters past an obstacle in the flow, such as a dam in the riverbed, upstream the natural flow direction of the water in the riverbed, wherein the arrangement comprises a hydraulic flow arrangement that comprises a first intake tube (1) from an upstream location with respect to the dam (4) from an intake point (12) to a downstream location with respect to the dam to a feeding point (2), where there is a fish gate to give access to the fish to enter into an elevation tube (3), to enter from said feeding point (2) in the water in said elevation tube to be transported in the elevation tube (3) to an outlet (5) at upstream location with respect to the dam, wherein the intake point (12) is at a higher water height than the outlet (5). The invention also relates to a system to guide a migratory fish to pass a dam (4) that comprises said migratory fish passage arrangement and additionally a siphon tube (134) from an upstream (217B)
