RIVERINE CLASSIFICATION BY CAHARACTERISTICS OF FISH APPEARANCE USING THE NATIONAL SURVEY FOR RIVER AND RIPERIAN ENVIRONMENT AND ITS ANALYSIS

Abstract

We classified Japan’s 109 riverine and 840 observatories by fish species monitoring data using the national survey for river and riparian environment for the rivers nationwide in following three cases about fish species. Such as all kinds of fish, freshwater fish and migratory fish.

As the results, in the case of all kinds of fish and observatories, the types of observatories nearby estuaries were different from other observatories. In the case of all kinds of fish and riverine, it was similar to the classification of the estuaries in the case of all kinds of fish and observatories. These showed that classifications by all kinds of fish were influenced by environmental factor of estuaries. In the case of freshwater fish and observatories, some observatories of the uppers were different types from the lowers of the same river. It showed that freshwater fish were influenced by environmental factor of each point. In the case of migration fish and observatories, the classifications were not clear in Honshu. It showed migration ability of those species is higher than that of freshwater fish.