Abstract
"Basic guidelines of nature-oriented river management" was notified in October, Heisei 18, and the explanatory booklet of technical standard "point II and III" was drawn up in Heisei 20 and 22. For example, when fish habitats are preserved and repaired, the system which can verify whether a design is appropriate or not is needed in the future.
However, in business, the actual condition still grasps the characteristic of a river using an explanatory booklet of technical standard and judges adoption experientially.
Therefore, PHABSIM is mentioned as a method of grasping and evaluating environment suitable for habitation of fishes. So, in this research, the four monotonous sections and the three diversity sections in two rivers, were investigated, and Fish Population Density and the relation of the index of diversity were confirmed . Moreover, data about the fastidiousness to the flow velocity of individual fishes, depth of water, and a substratum was able to be obtained from much literature in the work. Based on the data obtained here, we propose fishes habitat evaluation method useable in business in a river channel plan.
