Reproductive biology of spotted halibut, Verasper variegutus, in Tachibana Bay, Nagasaki Prefecture

DOI JASI HANDLE Web Site Open Access
  • Yamaguchi Sonoko
    Laboratory of Marine Biology, Division of Marine Bioresources, Department of Animal and Marine Bioresource Science, Faculty of Agriculture, Kyushu University | Laboratory of Marine Biology, Division of Marine Bioresources, Department of Animal and Marine Bioresource Science, Graduate School of Bioresource and Bioenvironmental Science, Kyushu University
  • Yoneda Michio
    Laboratory of Marine Biology, Division of Marine Bioresources, Department of Animal and Marine Bioresource Science, Faculty of Agriculture, Kyushu University | Laboratory of Marine Biology, Division of Marine Bioresources, Department of Animal and Marine Bioresource Science, Graduate School of Bioresource and Bioenvironmental Science, Kyushu University
  • Ohta Kohei
    Laboratory of Marine Biology, Division of Marine Bioresources, Department of Animal and Marine Bioresource Science, Faculty of Agriculture, Kyushu University | Laboratory of Marine Biology, Division of Marine Bioresources, Department of Animal and Marine Bioresource Science, Graduate School of Bioresource and Bioenvironmental Science, Kyushu University
  • Miyaki Kadoo
    Laboratory of Marine Biology, Division of Marine Bioresources, Department of Animal and Marine Bioresource Science, Faculty of Agriculture, Kyushu University | Nagasaki Prefectural Institute of Fisheries
  • Arakawa Toshihisa
    Laboratory of Marine Biology, Division of Marine Bioresources, Department of Animal and Marine Bioresource Science, Faculty of Agriculture, Kyushu University | Nagasaki Prefectural Institute of Fisheries
  • Matsuyama Michiya
    Laboratory of Marine Biology, Division of Marine Bioresources, Department of Animal and Marine Bioresource Science, Faculty of Agriculture, Kyushu University

Bibliographic Information

Other Title
  • 長崎県橘湾産ホシガレイの成熟生態
  • ナガサキケン タチバナワンサン ホシガレイ ノ セイジュク セイタイ

Search this article

Abstract

The reproductive biology of female spotted halibut, Verasper variegutus, was examined from 19 specimens sampled in Tachibana Bay, Nagasaki Prefecture during 27 December 1997 to 30 January 1998. The maturity stages of the ovaries were categorized into three classes based on the histological characteristics and the size-frequency distribution of oocytcs; pre-spawning, spawning and post-spawning. The occurrence rates of the different maturity stages of ovaries during the collection period suggested that the spawning season of spotted halibut in Tachibana Bay extends from late December to early February. Developing oocyte in the course of vitellogenesis formed a single clutch separated from the pre-vitellogenic oocyte group, which resulted in showing two peaks isolated each other in the size-frequency distribution of oocytes. After the completion of vitellognesis in all oocytcs of the advanced clutch, final oocyte maturation and following ovulalion occurred in a part of oocytes of the clutch. The number of oocytes of the advanced clutch gradually decreased during the spawning season due to serially occurring ovulalion. The ovaries after spawning contained only pre-vitellogenic oocytes scattered among the degenerating postovulatory follicles. Total fecundity (TF) in five fish with the ovaries at the prc-spawning stage was related to total length (TL, mm) as TF=7.45・10-6TL4.08 (341≦TL≦488).

長崎県橘湾で1997年12月～1998年1月に漁獲されたホシガレイの雌親魚19尾を用いて, 卵の発達動態を中心とした成熟生態について調査した. 組織学的特徴および卵径頻度分布こ基づき, 卵巣の成熟段階を産卵直前期, 産卵期および産卵終了期の3期に区分した. これらの卵巣の出現状況から, 橘湾における本種の産卵期は, 12月下旬から2月上旬であると推定された. 本種の卵の発達様式は, 周辺仁期の卵から一部の卵群が発達する卵群同期発達型に属し, 産卵様式は複数回に分けて成熟・排卵される分割産卵型であると考えられた. また, 総産卵数（TF）と全長（TL in mm) との関係は, TF=7.45・10-6TL408（341≦TL≦488）の式で表され, 平均全長427mmの個体における総産卵数ほ約45万粒であった．

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top