1. Graduate School of Bioresource Sciences, Akita Prefectural University, Akita, Japan
2. Faculty of Engineering, Kyushu University, Fukuoka, Japan
3. Department of Biological Environment, Akita Prefectural University, Akita, Japan
4. Akita Industrial Technology Center, Akita, Japan
5. Akita Aquatic Life Conservation Society, Akita, Japan