Takashi IWATA

Former Research Fellow
Ocean Policy Research Institute of The Sasakawa Peace Foundation
  • Ocean Vis

Takashi Iwata was Research Fellow of Ocean Policy Research Institute, SPF. His research field is animal ecology especially marine mammals such as cetaceans and pinniped using bio-logging method. Bio-logging method which records animal ecologies such as behaviour, distribution, physiology, sound, etc., using data-loggers which are attached on animals have been used to study animal ecology. He has studied about blue whales, humpback whales, Bryde’s whales, Antarctic fur seals, Weddell seals, and more from tropical area to polar regions throughout the world.


Animal ecology, Behavioural ecology, Marine mammals, Bio-logging






Akiyama Y., Akamatsu T., Rasmussen M. H., Iversen M. R., Iwata T., Goto Y., Aoki K. and Sato K. 2019. Leave or stay? Video-loggers revealed foraging efficiency of humpback whales under temporal change in prey density. PLOS ONE 14: e0211138.

Constantine R., Iwata T., Nieukirk. S. L., and Penry G. S. 2018. Future directions in research on Bryde's whales. Frontiers in Marine Science 5: 333.

Iwata T., Akamatsu T., Thongsukdee S., Cherdsukjai P., Adulyanukosol K., and Sato K. 2017. Tread-water feeding of Bryde's whales. Current Biology 27: 1154-1155.

Iwata T., Sakamoto K. Q., Edwards E. W. J., Staniland I. J., Trathan P. N., Goto Y., Sato K., Naito Y. and Takahashi A. 2015. The influence of preceding dive cycles on the foraging decisions of Antarctic fur seals. Biology Letters 11: 20150227.

Iwata T., Yonezaki S., Kohyama K. and Mitani Y. 2013. Detection of grooming behaviours with an acceleration data logger in a captive northern fur seal (Callorhinus ursinus). Aquatic Mammals 39: 378-384.

Iwata T., Hayashi T., Takasawa-Kasamatsu N. 2013. Report of seabird observation in the Indian sector of the Southern Ocean during the austral summer of 2005-2008. Czech Polar Reports 3: 82-86.

Sakamoto Q. K., Takahashi A., Iwata T., Yamamoto T., Yamamoto M. and Trathan P. N. 2013. Heart rate and estimated energy expenditure of flapping and gliding in black-browed albatrosses. The Journal of Experimental Biology 216: 3175-3182.

Iwata T., Sakamoto K. Q., Takahashi A., Edwards E. W. J., Staniland I. J., Trathan P. N. and Naito Y. 2012. Using a mandible accelerometer to study fine-scale foraging behavior of free-ranging Antarctic fur seals. Marine Mammal Science 28: 345-357.

Watanabe Y. Y., Sato K., Watanuki Y., Takahashi A., Mitani Y., Amano M., Aoki K., Narazaki T., Iwata T., Minamikawa S. and Miyazaki N. 2011. Scaling of swim speed in breath-hold divers. Journal of Animal Ecology 80: 57-68.

Sakamoto K. Q., Takahashi A., Iwata T., and Trathan P. N. 2009. From the eye of the albatrosses: A bird-borne camera shows an association between albatrosses and a killer whale in the Southern Ocean. PLoS ONE 4: e7322.

Iwata T., Mitani Y., Yonezaki S., Kohyama K. and Takahashi A. 2009. Validation of acceleration records to monitor swimming and prey-capture behavior in the captive northern fur seal. NIPPON SUISAN GAKKAISHI 75: 989-994.


- Weddell seal in McMurdo Sound, Antarctica from 2018/2019 to present
- Blue and humpback whale in the Husavik bay, Iceland from 2018 to present
- Humpback whale in the Gulf of Saint Lawrence, Canada in 2016 and 2017
- Sailfish in Caribbean Sea, Mexico in 2016
- Humpback whale in the coastal area of Tromso, Norway from 2016 to 2018
- Humpback whale in the Husavik bay, Iceland in 2014
- Bryde's whale in the upper Gulf of Thailand from 2013 to present
- Oceanographic survey in Southern Ocean in 2013
- Killer whale at Hokkaido, Japan in 2012
- Antarctic fur seal, black browed albatross, and macaroni penguin at Bird Island, South Georgia in 2008/2009
- Minke whale in the Gardur bay, Iceland in 2007





The Society for Marine Mammalogy
International Bio-logging Society
The Ecological Society of Japan
The Mammal Society of Japan
Japanese Society of Bio-logging Science


2020 Jun - Current: Research Fellow: Ocean Policy Research Institute, Sasakawa Peace Foundation
2020 Apr - 2020 May: Postdoctoral Researcher for Ocean Science: Atmosphere and Ocean Research Institute, The University of Tokyo
2018 Dec - 2020 Apr: Project Researcher: Atmosphere and Ocean Research Institute, The University of Tokyo
2016 Nov - 2018 Nov: Postdoctral Fellowships (JSPS Research Abroad): School of Biology, University of St Andrews
2016 Apr - 2016 Nov: Postdoctoral Researcher for Ocean Science: Atmosphere and Ocean Research Institute, The University of Tokyo
2013 May - 2016 Mar: Project Researcher: Atmosphere and Ocean Research Institute, The University of Tokyo
2012 Apr - 2013 Apr: Project Researcher: Oceanographic Observation Center, Tokyo University of Marine Science and Technology


2006 Apr - 2012 Mar: The Graduate University for Advanced Studies (Ph.D)
2002 Apr - 2006 Mar:Nihon University (bachelor)