アミノ酸混和コンクリートによる付着藻類の生長特性及びアユの蝟集効果に関する研究

抄録

Coastal structures built to conserve the shape of land have been added a new contribution to conserve environments. As one of such contributions, growth promotion effect on periphytic algae by concrete contained amino acids in actual sea area has been previously demonstrated. Thus aim of this work was confirmation of the effect in river region. The concrete block contained amino acid (AC) was installed in Fushinogawa River, Yamaguchi, with Ordinary concrete (OC) and field stone. Chlorophyll a in periphytic algae on AC remarkably increased than OC. And Homoeothrix janthina which was good for growth of Ayu Plecoglossus altivelis altivelis dominaltly covered on each blocks. Species composition of Periphytic algae on AC was similar to OC and field stone. In addition, AC and OC were installed in outdoor aquarium stocked with Ayu. The consumption frequency of algae on AC was larger than others. With all these results, this test demonstrated the growth promotion effect in river region.