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In consideration of life history of fishes, it is necessary to investigate the fish habitat structure not only in main rivers but also in various scales of tributaries and drainage channels connected them. Weirs and abrupt drops in river system could be discontinuity points which divide fish habitats, obstructing fish migration along river channels. Hence, we conducted a field investigation of the environmental characteristics in the Ijira river, a tributary of the Nagara river, and proposed an index expressing the difficulties in runs of fish prevented by these discontinuity points. Evaluating this index and the grade of three type of vegetation covers and introducing these values into a GIS, we showed tentative evaluation maps for fish habitat quality in the Ijira river.

FIELD STUDY ON FISH HABITAT EVALUATION ACCOUNTING FOR THE CONTINUITY OF RIVER CHANNEL SYSTEM