Japanese Band-rumped Storm-Petrel

Japanese Band-rumped Storm-Petrel Thalobata (castro) kumagai

Summer visitor; mid May-Nov. Endemic. Recent years, breeding population decrease sharply and opportunities to seen at sea are very rare.

Breeding sites are confirmed on Hide-jima (Iwate Pref); about a few to dozen pairs, but breeding population decrease; 25,000 pairs mid-1960s, but less than 36 pairs by 2010. One of the reasons is the decrease in suitable breeding grounds due to the increase of Streaked Shearwater. Perhaps Funakoshi-oshima and Sangan-jima (both Iwate Pref.) may breeds.

Fig. 1. Off Rokkasho, Aomori Pref. 23 Aug 2019.
Fig. 2. Same bird as Fig. 1. Off Rokkasho, Aomori Pref. 23 Aug 2019.
Fig. 3. Same bird as Fig. 1. Off Rokkasho, Aomori Pref. 23 Aug 2019.
Fig. 4. Same bird as Fig. 1. Off Rokkasho, Aomori Pref. 23 Aug 2019.
Fig. 5. Off Iwate Pref. 18 Jul 2020.
Fig. 6. Same bird as Fig. 5. Off Iwate Pref. 18 Jul 2020.
Fig. 7. Off Iwate Pref. 14 Jul 2018.
Fig. 8. Same bird as Fig. 7. Off Iwate Pref. 14 Jul 2018.
Fig. 9.
Fig. 10.
Fig. 11. Same bird as Fig. 10.
Fig. 12.
Fig. 13. Same bird as Fig. 12.
Fig. 14.
Fig. 15. Same bird as Fig. 14.
Fig. 16.
Fig. 17.
Fig. 18. Same bird as Fig. 17.
Fig. 19. Off Iwate Pref. 30 Jun 2018.
Fig. 20. Off Iwate Pref. 18 Jul 2020.