1. Enoshima Aquarium, Kanagawa, Japan
2. Laboratory of Veterinary Physiology, Tokyo University of Agriculture and Technology, Tokyo, Japan
3. Yokohama Hakkeijima Sea Paradise, Kanagawa, Japan
4. Department of Zoology, National Museum of Nature and Science, Ibaraki, Japan
5. Faculty of Health and Medical Sciences, Kanagawa Institute of Technology, Kanagawa, Japan
6. Nihon University Veterinary Research Center, Kanagawa, Japan