The quadrat method is a conventional way for resource survey of short necked clam. However, it is considered that this method requires skillful technique in order to get a highly accurate survey result. The current paper introduces a new method using a specific concrete (so-called Paste Concrete). The Paste Concrete is buried into the sediment as a settlement base of the clam, let the clams settle on it naturally and then is collected for the measuring. It is an unique method which well utilizes behavior of the clam.
