Notes on the Ovarian Histology of a Young Harbor Porpoise, Phocoena phocoena, Caught in Takashima, Hokkaido, Sea of Japan

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  • Honma Yoshiharu
    Division of Microscopic Anatomy and Bioimaging, Department of Cellular Function, Niigata University Graduate School of Medical and Dental Sciences
  • Ushiki Tatsuo
    Division of Microscopic Anatomy and Bioimaging, Department of Cellular Function, Niigata University Graduate School of Medical and Dental Sciences
  • Takeda Masaei
    Division of Microscopic Anatomy and Bioimaging, Department of Cellular Function, Niigata University Graduate School of Medical and Dental Sciences
  • Matsuishi Takashi
    Department of Marine Biology,Graduate School of Fisheries Science,Hokkaido University

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Other Title
  • 北海道高島沖の定置網に混獲された幼ネズミイルカの卵巣組織

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Abstract

<p>A histological examination was carried out on a young harbor porpoise, Phocoena phocoena (♀),1.3m long, caught in a set net installed off Takashima, Otaru City, Hokkaido, facing the Sea of Japan. The formalin-preserved left lobe of the ovary was 13mm long and 0.2g in weight, the right lobe being 20mm and 0.2g, respectively. Both lobes were smooth, flat and disc-shaped, and revealed similar microscopic conditions which confirmed the young age of the animal. The cortical region comprised a number of primordial- and primary follicles, and few secondary follicles, whereas the medullary region, consisting of a large amount of interstitial tissue, included a few vesicular and many atretic follicles, in association with spiral arteries. However, no Graaffian follicles were encountered, and the uterine glands were simple and underdeveloped.</p>

Journal

  • Japan Cetology

    Japan Cetology 16 (0), 13-19, 2006

    The Cetology Study Group of Japan

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