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The behavioral and physiological study on lunar-related maturation and spawning in honeycomb grouper.

蜂窝石斑鱼月球相关成熟和产卵的行为和生理研究。

基本信息

批准号：
15570067
负责人：
SOYANO Kiyoshi
金额：
$ 2.3万
依托单位：
Nagasaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

Honeycomb grouper, which is distributed in the sub-tropical and tropical area in Pacific Ocean, is known as a lunar-related spawner. However, details of gonadal development and spawning in this species are not well understood. In this study, we investigated the gonadal development and hormonal changes in female collected from the fringing reef area around Sesoko Island during spawning season and observed the spawning in artificial conditions. Moreover, we investigated the spawning migration to the outside of fringing reef for spawning using biotelemetry method.Gonadosomatic index increased rapidly and reached the maximum level around the full moon in late May or early June, when ovaries were occupied with oocytes of the tertiary yolk stage. The fish of maturational size disappeared from the fringing reefs for a few days after the full moon. When the fish appeared again in the same reef area, there was no vitellogenic oocyte in the ovary. These results indicate that the fish spawned in the area outside the fringing reefs after the full moon. In artificial conditions, the final oocyte maturation and spawning were observed for a few days after the full moon, while the maturated fish migrated outside the fringing reefs in natural conditions. The spawning of individuals was carried out for three or four days. This results elucidated clearly that honeycomb grouper is a lunar-related spawner.

蜂窝石斑鱼分布在太平洋的亚热带和热带地区，被称为与月球相关的产卵者。然而，该物种的性腺发育和产卵的细节尚不清楚。本研究对采自雪子岛周边珊瑚礁区的雌鱼在产卵季节的性腺发育和激素变化进行了研究，并在人工条件下观察了雌鱼的产卵情况。此外，我们还利用生物遥测法研究了产卵迁移到边缘礁外产卵的情况。性腺指数迅速上升，在5月下旬或6月初满月前后达到最大值，此时卵巢被第三卵黄期的卵母细胞占据。满月后的几天里，成熟大小的鱼从珊瑚礁的边缘消失了。当鱼再次出现在同一礁区时，卵巢中没有卵黄细胞。这些结果表明，鱼在满月后在边缘珊瑚礁以外的区域产卵。在人工条件下，在满月后几天观察卵母细胞的最终成熟和产卵，而在自然条件下，成熟的鱼在边缘珊瑚礁外洄游。个体的产卵进行了三到四天。这一结果清楚地说明了蜂窝石斑鱼是一种与月球有关的产卵动物。