An improved Coanda effect fish pump that allows forimproved pump performance with enhanced and unsymmetrical-irregularities features in circumferential flow gaps and orificeflutes that improve water flow distribution and pumpperformance.Design features improve fish quality duringpumping and can be designed to remove sea ice from salmon. Thefeatures reduce spinning in the pump, correct for unsymmetricalinput water pressure distribution, and reshape water velocitiesto more effectively remove sea lice.