Abstract
The instream flow incremental methodology and the other simulation model were introduced in River regulation programs in many countries. But, we have not used such evaluation models for environmental management in rivers/streams in Japan. In this paper, we tried to find a more convenient method for fish habitat evaluation using modified IFIM. The habitat preference estimation only from the macrohabitat model, PHABSIM, could not lead to accurate evaluation. It is necessary to find the parameter in the large-scale such as the long streamline range. The extraction of the explanatory variable as a necessity facilitated the use of the multiple regression analysis. In this case, the highest temperature during summer is most important variable for the macrohabitat evaluation.
