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| English nameソート | Scientific nameソート | Found Dateソート | Prefectureソート | City/Locality | 
|---|---|---|---|---|
| Risso's dolphin | Grampus griseus | DD, May , 1997 | Kumamoto-ken | Amakusa-gun Reihoku-Machi | 
| Stejneger's beaked whale | Mesoplodon stejnegeri | 30, April, 1997 | Niigata-ken | |
| Harbour porpoise | Phocoena phocoena | 30, April, 1997 | Hokkaido | |
| Harbour porpoise | Phocoena phocoena | 28, April, 1997 | Hokkaido | |
| Unidentified Mesoplodon | Mesoplodon sp. | 27, April, 1997 | Hokkaido | Matsumae-gun Fukushima-Cho | 
| Spotted seal | Phoca largha | 26, April, 1997 | Hokkaido | Shari-gun Shari-Cho | 
| Pacific white-sided dolphin | Lagenorhynchus obliquidens | 25, April, 1997 | Niigata-ken | |
| Ribbon seal | Histriophoca fasciata | 25, April, 1997 | Hokkaido | Monbetsu-shi | 
| Pacific white-sided dolphin | Lagenorhynchus obliquidens | 25, April, 1997 | Niigata-ken | |
| Ringed seal | Pusa hispida | 25, April, 1997 | Hokkaido | Shari-gun Shari-Cho | 
| Spotted seal | Phoca largha | 22, April, 1997 | Hokkaido | Nakagawa-gun Toyokoro-Cho | 
| Stejneger's beaked whale | Mesoplodon stejnegeri | 22, April, 1997 | Hokkaido | Matsumae-gun Matsumae-Cho | 
| Harbour porpoise | Phocoena phocoena | 21, April, 1997 | Hokkaido | |
| Unidentified whale | - | 20, April, 1997 | Hokkaido | Hakodate-shi | 
| Stejneger's beaked whale | Mesoplodon stejnegeri | 18, April, 1997 | Yamaguchi-ken | |
| Harbour porpoise | Phocoena phocoena | 17, April, 1997 | Hokkaido | |
| Unidentified Mesoplodon | Mesoplodon sp. | 17, April, 1997 | Hokkaido | Matsumae-gun Fukushima-Cho | 
| Unidentified Mesoplodon | Mesoplodon sp. | 17, April, 1997 | Hokkaido | Matsumae-gun Fukushima-Cho | 
| Unidentified Mesoplodon | Mesoplodon sp. | 16, April, 1997 | Hokkaido | Suttsu-gun Suttsu-Cho | 
| Minke whale | Balaenoptera acutorostrata | 14, April, 1997 | Hokkaido | Nemuro-shi |