Location: Taiki-cho, Hokkaido, Japan
March 22, 2012 3:02 am
I live in eastern Hokkaido, Japan, in a small farming village. The other day I found some bugs I had never seen before in my bathtub, and then, when I left my apartment, saw literally hundreds on my apartment’s walls and windows! I have never seen these bugs before, and I’ve lived in Japan for over 3 years now (and I’ve even encountered Asian giant hornets!) This was the best picture I could take of them. They are over 1cm long.
If you could help me out that would be great!
Just because there is a large population of an insect does not mean it is an infestation or some other bad portent. This is a Stonefly and the larvae or naiads of Stoneflies are aquatic insects that can only survive in unpolluted running water like streams and brooks. The fact that there is a large population of Stoneflies is an indication that the water in your area is relatively pure, so take this spring swarm as a good sign.