Inlet for a hydrodynamic screw

Inlet for a hydrodynamic screw for transporting water and organisms such as fish living in water, the inlet (10) comprising

• a first end (11) connectable to a hydrodynamic screw, the first end having a first opening,
• a second end (12) for receiving water and organisms living in water for transporting through the inlet towards the first end, the second end having a second opening, and
• an inlet body (17) connecting the first end (11) and the second end (12), the inlet body (17) comprising a hollow that extends through the inlet body (17) and connects the first opening and the second opening, wherein
• the inlet (10) has a first diameter at the first opening and a second diameter at the second opening, the second diameter being larger than the first diameter, and
• the inlet (10) further comprises a ridge (14) arranged on an inner surface (19) of the hollow, the ridge (14) being arranged in a helix and the ridge (14) further having a height (h) that is larger in at least a first part than in at least a second part, said first part being closer to the first end than said second part.