Distribution of Cobitis biwae juvenile in a fallow field of a Hill-bottom Valley

Abstract

We report the survey results documenting the habitat distribution of spined-loach in a fallow field of a hill bottom valley. Spined-loach populations were concentrated at the water entrances and exit in the field. Mostly juvenile fish were caught, with highest populations concentrated in fast flowing deep water, and where the bottom substrate consisted of sandy or silt sediment. The species entered the fallow field through connections to an upper paddy field with a network leading to a ditch in the hill-bottom valley.