Migrating fish often want to travel between different bodies of water, which may be positioned at different heights. To overcome these heights, water passages may be used that provide a water path at a slope over which a fish is able to swim up. A compact housing is provided by allowing a water guide over which the water flow flows to rotate around an axis parallel to gravity in a helical shape. The fish lock may be provided with a resting chamber which comprises a volume of water with a low flow velocity. Sensors and a controller may be provided to control a flow rate of the water through the fish lock according to for example the type of fish passing through the fish lock and an administrator may monitor the fish lock at a distance and may be contacted in case of malfunction.
