天龍川南向発電所におけるシマトビケラの研究

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1 Generally, a number of the caddisfly larvae inhabit in the water-tunnels which conduct the water from the dam to the power plant, and they lead to reduction of efficiency of the power plant, sometimes by 10 to 20 per cent. 2. The author studied on the responsible species at the various power plants in Japan. In this report the author deals with the case of Mmakata Water Power Plant of the Tenrm-gawa, Nagano Pref. 3. In the water tunnel of Minakata Power Plant, theauthor found 11 species ofinsects belonging to five orders, namely, 5 Trichoptera-, 2 E phemeroptera-, 2 Plecoptera-, 1 Neuroptera-,and 1 Coleoptera-species. Net-spinning caddisfly larvae were the most dominant, occuping about 90 per cent of the total. 4. Of the caddisfly larvae, Hydropsyche ulmen and Hydropsychodes brevilineata are responsible of the reduction of efficiency. 5. The distribution of the Hydropsychid larvae in the water tunnel are shown in Fig. 3. 6. The caddisfly larvae live mainly on diatoms, while they are devoured by Paragnetina tinctipennis, Ryacophila yamanakensis and Prothohermes grandis 7. On the control of the caddisfly larvae of the tunnel wall, the author is inclined to consider that the mechanical cleaning of the wall and the application of paints containing some insecticides are most useful.
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