Development of Utilization Criteria of Habitat Variables in Instream Flow Incremental Methodology

Abstract

The main objectives of this study is to develop utilization criteria of habitat variables in IFIM based on several methods. We utilized habitat variables such as velocity, depth, and substrate for pale chub, dark club, and river lizard goby in Oto River observed in 1994. We measured water temperature during the summer in 1995 to improve the IFIM by introducing the relationship between this and number of captured fishes. The major conclusions are as follows:(1) Utilization criteria of velocity for pale chub in summer is best developed by UPA, and (2) Water temperature (during one day) data are not sufficient at present to explain the relationship between this and number of captured fishes.