Gonadal State of Wild Amphioxus Populations and Spawning Success in Captive Conditions during the Breeding Period in Japan(Ecology)
スポンサーリンク
概要
- 論文の詳細を見る
Adult individuals of amphioxus (Branchiostoma belcheri) were collected by dredging from a research vessel at selected stations in two areas off the coast of Japan in July 2000: Deyama and Takamatsu so named by local fishermen in the Enshu Nada Sea. The number of males collected exceeded that of females at all the stations in Takamatsu and at four of five stations in Deyama. The over all sex ratio (males: females) of the collected animals was 1.2:1. The animals showed various maturational stages of the gonad, and approximately 70% had mature gonads. However, post-spawning animals were identified only at two stations in Takamatsu. Mature animals were placed in laboratory tanks. These animals remained in good conditions for about two months, and many animals spontaneously spawned in the tanks. This is the first report of spontaneous spawning of B. belcheri in Japan.
- 社団法人日本動物学会の論文
- 2003-07-25
著者
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KUBOKAWA Kaoru
Ocean Research Institute, University of Tokyo
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Kubokawa Kaoru
Department Of Molecular Biology Ocean Research Institute The University Of Tokyo
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Azuma Nobuyuki
Faculty Of Agriculture And Life Science Hirosaki University
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Azuma N
Faculty Of Agriculture And Life Science Hirosaki University
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Mizuta Takanobu
Ocean Research Institute, University of Tokyo
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Kubokawa kaoru
Misaki Marine Biological Station
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Morisawa Masaaki
The Misaki Marine Biological Station, University of Tokyo
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Kubokawa Kaoru
Ocean Res. Inst. Univ. Of Tokyo
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Morisawa M.
Misaki Mar. Biol. Stat., Grad. Sch. Sci., Univ. of Tokyo
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Mizuta T
Department Of Molecular Biology Ocean Research Institute The University Of Tokyo
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Mizuta Takanobu
Ocean Research Institute University Of Tokyo
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Kubokawa K
Department Of Molecular Biology Ocean Research Institute The University Of Tokyo
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Morisawa M
Misaki Marine Biological Station The University Of Tokyo
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Mizuta Takanobu
Ocean Research Institute
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