Patent ID: 7363878

Claim:
A waste water extraction system for an aquaculture receptacle having a side wall and a bottom wall, said receptacle filled with water to a particular water level, said system including at least: a first conduit having first and second ends; a second conduit disposed inside said first conduit, said second conduit having first and second ends; a plate extending transversely across and sealing said first end of said first conduit and extending laterally of said first conduit, said plate provided with an axial hole in fluid communication with said first end of said second conduit, and said first end of said first conduit provided with at least one aperture near said plate; and, spacer means on a surface of said plate opposite said first conduit for spacing said plate from said bottom wall; said first and second conduits configured to exit said receptacle at a location at least partially below said pre-determined water level.