Gonadal state of wild amphioxus populations and spawning success in captive conditions during the breeding period in Japan
Gonadal state of wild amphioxus populations and spawning success in captive conditions during the breeding period in Japan
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DOI：
10.2108/zsj.20.889
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发表时间：
2003-07-01
影响因子：
0.9
通讯作者：
Azuma, N
中科院分区：
文献类型：
--
作者：
Kubokawa, K;Mizuta, T;Azuma, N
2000年7月，在日本近海的两个地区（Deyama和Takamatsu，由当地渔民命名为Enshu Nada海）的选定站点，从一艘研究船上采集了文昌鱼（Branchiostoma belcheri）的成年个体。在高松的所有站点和出山的五个站点中的四个站点，收集的雄性数量超过了雌性。采集动物的总体性别比（雄性：雌性）为1.2：1。这些动物显示出不同的性腺成熟阶段，大约70%的动物具有成熟的性腺。然而，仅在高松的两个站发现了产卵后的动物。将成熟动物置于实验室水槽中。这些动物在良好的条件下保持了大约两个月，许多动物自发地在水箱中产卵。这是B自然产卵的首次报道。在日本的Belcheri。
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.