Observation of a gray whale, Eschrichtius robustus, that appeared in Tokyo Bay in 2005.

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Other Title
  • 2005年に東京湾に出現したコククジラの観察
  • 2005ネン ニ トウキョウワン ニ シュツゲン シタ コククジラ ノ カンサツ

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Description

<p>During mid-April to early May in 2005, a gray whale occurred in Tokyo bay. On May 11, the animal was finally caught at a set net 1km off Tomiyama, Minami Boso city at the entrance of Tokyo bay. We observed the animal at three occasions in the areas off Sodegaura, Narashino, and between Yokosuka and Yokohama. In those waters, the animal occurred at inshore shallow waters, off 50 m to 100 m in Sodegaura, off 10 m to 100 m in Narashino, off 100 m to 1,400 m (depth between 11 m and 18 m) between Yokosuka and Yokohama. The anima1 presumably tried to feed both in Sodegaura and Narashino areas, and simply cruised between Yokosuka and Yokohama. It was suspected that the animal strayed into Tokyo bay on the way up to the feeding ground in the north. Psossibilities of the preference of feeding on the muddy bottom and instinctive traveling to the north were suspected.</p>

Journal

  • Japan Cetology

    Japan Cetology 19 (0), 17-22, 2009

    The Cetology Study Group of Japan

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