サメ類の研究-XIV.マレーシア, ペラック河で採集されたTelok Anson sharkの生殖生態

• 手島 和之

  下関市吉見水産大学校 東京大学海洋研究所

• Ahmad Mukhtar

  Shimonoseki University of Fisheries Ocean Research Institute, University of Tokyo

• 水江 一弘

  東京都中野区東京大学海洋研究所

書誌事項

タイトル別名

• Studies on Sharks-XIV. Reproduction in the Telok Anson Shark Collected from Perak River, Malaysia

抄録

The Telok Anson shark, Scoliodon laticaudus, which is distributed in rivers and lakes in Indonesia and Malaysia was collected and the reproductive biology in both male and female was examined. Reproductive activity takes place throughout the year. The male S.laticaudus is estimated to reach maturity at about 330 mm in total length based on condition in the testis, seminal vesicle and clasper. The female S.laticaudus has two functional ovaries. Oocytes are lined by a single layer of follicular cells. A mature egg is small and its size at ovulation is about 1mm in diameter. A fertilized egg is covered with a gelatinous substance, and has cilia at both sides. Yolk does not exist in the foetal placenta even in the early gestation, and capillaries are well developed in tissues inside the foetal placenta. The embryo is nourished by the placenta from the earliest stage of gestation. The umbilical stalk contains only an artery and a vein. There is no ductus vitellointestinalis. The umbilical stalk has many appendiculae, whose epithelia absorb nutrition from the uterine fluid. The size at sexual maturity in the female is estimated to be about 325-350mm in total length.

収録刊行物

• 魚類学雑誌

  魚類学雑誌 25 (3), 181-189, 1978

  The Ichthyological Society of Japan

詳細情報

• CRID: 1390282679744914048
• NII論文ID: 130003826017
• DOI: 10.11369/jji1950.25.181
• ISSN: 18847374
• ISSN: 00215090
• データソース種別:
  • JaLC
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可