Patent ID: 7201114

Claim:
An apparatus for attracting aquatic crustaceans, which comprises: a container for carrying a water body of culture; and a means for generating an effect of bright and dark contrast adapted to said container; wherein said means for generating an effect of bright and dark contrast includes: a combination of geometrical or non-geometrical patterns with different levels of brightness which is arranged at said predetermined place; and an illuminating source which is arranged above said combination of geometrical or non-geometrical patterns with different levels of brightness; and said effect of bright and dark contrast is expressed at a predetermined place inside said container and said predetermined place is selected from the group consisting of (1) a region on the inner side of said container's bottom portion; (2) a region on the inner side of said container's wall below the water surface of said water body of culture; (3) a region at or under the water surface of said water body of culture on a floating attachable material; and (4) a region at or under the water surface of said water body of culture on a fixed attachable material; and whereby said predetermined place can be distinguished into a first brightness sub-area and a second brightness sub-area and said first brightness sub-area is brighter than said second brightness sub-area.