This paper focuses on the method for estimating the effects on environmental natural situations by economic development in coastal waters in Japan. In particular. the most critical relations between the impacts and marine organisms behavior are pointed out and discussed according to the environmental impact assessment. Finally, some subjects and hints are presented for an implementation of an environmental impact study.
1. Introduction
Economical developments and enhancement of human life are a more desirable matter in the world since the industrial revolution. Coastal waters and shallow areas are an important region to contact between the artificial and natural situation. All substances produced by industrial activities are ultimately passed through the coastal water to the ocean. Of great interest to us are those substances that dissolve and suspend during discharge and are carried into the coastal waters. Nowadays, shallow regions are changed on a large scale by reclamation, construction of harbors, bridges, amusement places. and others in Japan. It is assumed to estimate the effects that these developer's impacts are affecting the coastal environment and organisms. more or less by the law. Construction for a procedure and estimation methods for environmental impact assessment are very important for developers and the citizens.
The procedure of environmental impact is commonly used for the process that allows the following questions to be answered:
How much size of time-space scale will they predicts?,
Who can understand the organisms?,
What analyzes the natural mechanisms?
Can it evaluate the environmental impact?
Since 1970. the effects on the environment in order to preserve water quality have been carried out mainly in the coastal waters in Japan. Marine organisms can not be sampled and analyzed without the effects of heavy metals. Moreover, most of marine organisms were collected only for monitoring tests compared with past data during observation period for assessment. On the contrary. estimating the effects on marine organisms is important but difficult, because the relationship between behavior of organ-
