Abstract
The objective of this research was to conduct quantitative evaluation of the possibility of fresh water fish to live, based on “PHABSIM”, a US-proven physical environment evaluation model that is increasingly gaining attention in Japan. In this research, the Mac Cormack method, that had earned a reputation for mixed flow (ordinary and shooting flow) simulation, was applied to an actual river.As a result of investigation conducted on the data of 1999 and 1998 about Mochigase points of the Sendai River, we found that the weighted usable area of sufficiently large size is preserved for L (Tribolondon) halconensis in every growth stage between the dry and rainy seasons, but that of Rhinogobius flumineus is extremely insufficient through the year.
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