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Gonadal state of wild amphioxus populations and spawning success in captive conditions during the breeding period in Japan

机译：日本繁殖期野生两栖类种群的性腺状态和圈养条件下的产卵成功

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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.
机译：2000年7月，在日本沿海两个地区的选定站点，从研究船上挖出的两栖动物成年个体：细山（Deyama）和高松，由恩苏那达海的当地渔民命名。在高松市的所有监测站和德山市的五个监测站中，有四个监测站收集到的男性数量超过了女性。所收集的动物的总体性别比（雄性：雌性）为1.2：1。这些动物表现出性腺的各种成熟阶段，大约70％的动物具有成熟的性腺。但是，仅在高松市的两个站点发现了产卵后动物。将成年动物放在实验室水箱中。这些动物保持良好状态约两个月，许多动物自发地在水箱中产卵。这是日本B. belcheri自发产卵的首次报道。

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