Abstract
In a river ecosystem, atthached algae are the primary producers that compound an organic matter. A lot of studies, which lacks sun light in the river ecosystem, have regarded with water temperature and nutrient. We have studied sun light and turbidity that have an effect on attached algae growth in a river ecosystem. Sweetfish, which is one of the major river fish in Japan, have decreased the fishery figure in the TONE river. In this article, we have studied the growth rate of attached algae in four places of the river in summer when sweetfish take algae and grow. We show our success in attached algae affected by sun light and turbidity in the river.
