1. Laboratory of Veterinary Pathology, Department of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University, 1–1 Yanagido, Gifu 501–1193, Japan
2. Enoshima Aquarium, 2–19–1 Katase Kaigan, Fujisawa 251–0035, Japan
3. Gifu World Fresh Water Aquarium, 1453 Kawashima Kasada, Kakamigahara 501–6021, Japan
4. Laboratory of Veterinary Clinical Oncology, Department of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University, 1–1 Yanagido, Gifu 501–1193, Japan
5. Department of Veterinary Parasitology, Faculty of Veterinary Medicine, Beni-Suef University, Beni-Suef 62511, Egypt