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A study on early life ecology of abalone species and factors affecting their mortalities in southern Japan

日本南部鲍鱼早期生命生态学及其死亡率影响因素研究

基本信息

批准号：
13460083
负责人：
KAWAMURA Tomohiko
金额：
$ 7.87万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13460083/
关键词：
abalone early life ecology reproductive ecology factors affecting mortality recruitment 滅耗要因

项目摘要

The reproductive biology and early life ecology of abalone, Haliotis discus discus, H. madaca, H. gigantea and H. diversicolor, which inhabit in southern area in Japan, were investigated by field observations and laboratory experiments in this study. The factors affecting recruitment of the northern species Haliotis discus hannai, which has more information on its reproduction and ecology in the early life stages than the southern abalone species, were analyzed and discussed.Epidemic spawning of the small abalone Haliotis diversicolor appeared to be synchronously with typhoon events. The larval settlement and initial survival of post-larvae could be strongly influenced by sediment on the settlement substrata and wave disturbance. The dietary conditions and water temperature in their habitats could affect the survival and growth rates of juveniles. The radula development in H. diversicolor was different from that in H. discus hannai, suggesting the main diets and thus habitat of H. diversicolor are different from those of big abalone species.Larvae and post-larvae of big southern abalone species, H. discus discus, H. madaca, H. gigantea, appeared from October to January. However, any associated spawning cues were not detected. Densities of the post-larvae of these big species were much lower than that of H diversicolor. Successful reproduction of the big abalone species may be inhibited due to the low density of their spawning populations.As present major factors affecting recruitment of H. discus hannai, seawater temperature during winter, density of spawning adults, and dietary conditions for post-larvae were suggested.

采用野外观察和室内实验相结合的方法，对日本南部地区的皱纹盘鲍、Madaca鲍、巨鲍和杂色鲍的繁殖生物学和早期生活生态进行了研究。对北方皱纹盘鲍(Haliotis Disus Hannai)早期繁殖和生态信息较南方鲍种多的影响因素进行了分析和讨论，发现皱纹盘鲍(Haliotis Dissicolor)的流行产卵与台风事件同步。沉积基质上的沉积物和波浪扰动对仔鱼的沉降和仔鱼的初始存活有很大的影响。栖息地的摄食条件和水温会影响幼鱼的存活和生长速度。皱纹盘鲍和皱纹盘鲍的牙根发育不同，说明杂色盘鲍的主要食性和栖息地与大型鲍鱼不同。南方大型鲍种皱纹盘鲍、圆盘鲍、巨鲍的幼体和后期幼体出现在10月至1月。然而，没有检测到任何相关的产卵线索。这些大型鱼种的后期幼虫密度远低于杂色夜蛾。文中还提出了影响皱纹盘鲍繁殖的主要因素：冬季海水温度、产卵成鱼密度和仔鱼的摄食条件。