Studies on harbour porpoise Phocoena phocoena incidentally caught by fishing gears around Japan and the mechanism of bycatch

2005 Fiscal Year Final Research Report Summary

• Project/Area Number: 15310159
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Resource conservation science
• Research Institution: HOKKAIDO UNIVERSITY
• Principal Investigator: MATSUISHI Takashi Hokkaido Univ., Fac.of Fish.Sci., Asso.Prof., 大学院・水産科学研究院, 助教授 (60250502)
• Co-Investigator(Kenkyū-buntansha): ITO Kiyohide Future Univ. Hakodate, School of Systems Information Sci., Asso.Prof., システム情報科学部, 助教授 (90325895) ; SASAKI Masato Tokyo, Univ., Grad.School.of Interdisciplinary Information Studies, Prof., 大学院・情報学環, 教授 (10134248) ; IIDA Koji Hokkaido Univ., Fac.of Fish.Sci., Prof., 大学院・水産科学研究院, 教授 (40142707) ; SUZUKI Kentaro Sapporo Gakuin Univ., Fac.Humanities, Asso.Prof., 人文学部, 助教授 (10308223)
• Project Period (FY): 2003 – 2005
• Keywords: Harbour Porpoise / Stranding / searching behaviour / echo-location / cricks

Research Abstract

The stranding records of Harbour porpoise Phocena phocoena collected by Institute of Cetacean Research was analyzed and the high proportion of the stranding was reported on April and May. The most frequently reported stranding place was Usujiri (36 individuals) and the next was Shiraoi (7 individuals). The number of bycatch individuals confirmed by our survey was 16. From the observation of ovary, they were immature. The passability experiment was conducted in the pool of Otaru Aquarium for an individual and found that the 50% passable aperture width was 39cm and become narrower as the habituation. The tau dot analysis was conducted to find the approach speed control to the target. Tau was increased linearly and tau-dot was estimated as 0.772. There were two inflection points of tau at 2sec and 0.7sec before the target. From the behaviour observation, there were two peaks of inter crick intervals at 2ms and 5ms, which means the target of the echo-location was 1.5m and 4m. These result suggest that the target recognitions of harbour porpoise was occurred at 4m and 1.5m before the target using echo-location.

Research Products

• [Journal Article] Velocity Control of Harbor Porpoise (Phocoena phocoena) : A case study. (2005)
  • Author(s): Ito, K., Matsuishi, T, Ito, A., Kojima, Y., Miyashita, A., Aoyama, M.
  • Journal Title: Studies in perception and action 8 Pages: 77-81
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] 噴火湾の定置網に混獲されるネズミイルカについてII (2005)
  • Author(s): 松石 隆, 石上朋子, 坂本渚
  • Journal Title: 日本海セトロジー研究会第16回大会発表要旨集 Pages: 7
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] 北海道南部噴火湾沖の定置網に混獲された幼ネズミイルカの卵巣組織 (2005)
  • Author(s): 本間義治, 牛木辰男, 武田政衛, 松石 隆
  • Journal Title: 日本海セトロジー研究会第16回大会発表要旨集 Pages: 8
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] 生態心理学的アプローチによるネズミイルカの間隙通過判断に関する研究 (2005)
  • Author(s): 伊藤精英, 松石 隆, 西脇茂利, 佐々木正人, 青山守
  • Journal Title: 日本海セトロジー研究会第16回大会発表要旨集 Pages: 9
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] 津軽海峡における鯨類の種構成と地理的・季節的分布についてII (2005)
  • Author(s): 長尾優輝, 須藤竜介, 浦西茉耶, 川南拓丸, 井原美香, 飯塚慧, 上田茉莉, 松石 隆
  • Journal Title: 日本海セトロジー研究会第16回大会発表要旨集 Pages: 15
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Velocity Control of Harbor Porpoise (Phocoena phocoena) : A case study. (2005)
  • Author(s): Ito, K., Matsuishi, T., Ito, A., Kojima, Y., Miyashita, A., Aoyama M.
  • Journal Title: Studies in perception and action 8 Pages: 77-81
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Harbour porpoise Phocoena phocoena incidentally caught by the set nets in Funka bay, Hokkaido, Japan II. (2005)
  • Author(s): Matsuishi, T., Ishigarni, T., Sakamoto N.
  • Journal Title: Abstracts of the papers presented at the 16^<th> congress of The sea of Japan Cetology Research group Pages: 7
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Ovarian histology of a young harbor porpoise, Phocoena phocoena, caught off the coast of Funka Bay, southern Hokkaido. (2005)
  • Author(s): Honma, Y., Ushiki, T., Takeda, M., Matsuishi, T.
  • Journal Title: Abstracts of the papers presented at the 16^<th> congress of The sea of Japan Cetology Research group Pages: 8
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] The study on perception of passability between interspaces by a harbor porpoise (Phocoena phocoena) from ecological approach. (2005)
  • Author(s): Ito, K., Matsuishi, T., Nishiwaki, S., Sasaki, M., Aoyama, M.
  • Journal Title: Abstracts of the papers presented at the 16^<th> congress of The sea of Japan Cetology Research group Pages: 9
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Species composition and geographical seasonal distribution of Cetacean in Tsugaru Strait, Japan. II (2005)
  • Author(s): Nagao, Y., Sudo, R., Uranishi, M., Kawaminami, T., Ihara, M., Iizuka, S., Ueda, M., Matsuishi, T.
  • Journal Title: Abstracts of the papers presented at the 16^<th> congress of The sea of Japan Cetology Research group Pages: 15
  • Description: 「研究成果報告書概要(欧文)」より