The purpose of this study is to clarify the effect of improvement work of man-made tide pool at Tannowa-Hakotsukuri artificial rocky coast on marine organisms. This work fills the tide pool with gravel and cuts off a part of upper edge of the side walls in tide pools. Then, the field observations on marine organisms arecarried out in the man-made tide pools.
As a result, the number of species of marine organisms increases as compared with the number before the improvement work. Especially, the diversity of marine organisms is improved at the tide pool which is far from the low water shoreline. Moreover, porous concrete, concrete with slits in surface and covered with porous mats are recommended for the construction material of man-made tide pool.
