Since prehistoric time, fishing gears have been used to catch fishes directly and auxiliary gears like shelters
have been also used to gather fishes around them. In addition, there are some fishing gears like setnets or traps,
which work as aggregating devices.
The artificial stone bed located in the coast of Kochi prefecture, which is supposed to be built in the middle
of 17th century, is a device to gather fishes and to catch them easily. The artificial stone bed located in the
coast of Aomori prefecture, which is supposed to be built in the middle of 18th century is for the increase of
They have been developed in different districts and their objects, i.e., fishes or tangle, are different from
each other. But their purposes, i.e., making use of the function to gather objective creatures, are the same with
To develop these kind of techniques, it is important that ecological knowledge of objective creatures,
especially their ethological knowledge against things Iocated in the water. In close cooperation with the resources
management and environmental conservation projects, these techniques will keep or increase marine resources
and lead to stable fishery.