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| Location (Population) | Sampling period | Number of animals | Category based on body length |
|||
|---|---|---|---|---|---|---|
| <90 cm | 90−110 cm | >110 cm | Unclear | |||
| Omura Bay (OB) | 2010−2015 | 50 | 17 | 7 | 26 | - |
| Ariake Sound, Tachibana Bay (AT) | 2010−2015 | 42 | 6 | 10 | 25 | 1 |
| Seto Inland Sea (SIS) | 2012−2015 | 24 | 5 | 2 | 17 | - |
| Ise Bay, Mikawa Bay (IM) | 2014 | 19 | 14 | 0 | 5 | - |
| Pacific coast of Chiba and Ibaraki prefecture (TS) | 2013−2014 | 2 | 1 | 0 | 1 | - |
| Total | 137 | 43 | 19 | 74 | 1 | |
