Artificial habitat for aquatic animals

Artificial habitat for aquatic animals, comprising a tank having a bottom and containing water at a given level, an insert disposed in said tank, said insert including a frame defining an opening surrounded by said frame, a screen attached to said frame and covering said opening for supporting aquatic animals, means in the form of a grating including screen supports spaced apart on said bottom of said tank for supporting said frame with said screen at said given level, said frame and said screen being supported on said grating with said screen at said given level, said tank having oppositely disposed walls defining a given distance therebetween, said screen supports being shorter than said given distance, said screen supports having ends, said screen supports being adjacent one another in said tank, and said ends of adjacent screen supports abutting opposite walls of said tank defining a serpentine path for water between said screen supports, and an inlet and an outlet feeding water into and out of said tank below said given water level and producing a water current at said screen along said serpentine path for removing waste from said screen.

Artificial habitat for aquatic worms, comprising a frame defining an opening surrounded by said frame, a screen attached to said frame and covering said opening for supporting aquatic worms, means for supporting said frame with said screen at a given level in the air, and means for circulating water along at least part of said screen for removing waste from said screen, said supporting means being in the form of blocks supporting said frame and said screen, and said circulating means being in the form of at least one nozzle spraying water on said screen.