...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Zoological Science >Ecological aspects of the Japanese eel, Anguilla japonica, collected from coastal areas of Japan
【24h】

Ecological aspects of the Japanese eel, Anguilla japonica, collected from coastal areas of Japan

机译：从日本沿海地区收集的日本鳗An的生态方面

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The ecological characteristics of 597 yellow and silver-stage Japanese eels, Anguilla japonica, were examined and compared among collection sites located at three different latitudes of Japan (Amakusa Islands, Milkawa Bay, and Sanriku Coast) to provide basic data on this unusual catadromous fish species. Eels were sexed and their total length, body weight, age, and growth rate based on otolith analysis was compared among sexes, stages, and collection sites. The overall sex ratio favored females (94%), but the sex ratio differed among the three locations. The frequency of females was highest in the coastal waters at Sanriku in the north (100%), next highest at Mikawa Bay in central Japan (95%), and lowest in the Amakusa Islands in the south (70%). Silver eel males ranged from 41.2-66.3 cm in length and 4-10 years in age, and silver eel females from 44.3-97.2 cm in length and 5-17 years in age. Female eels generally grew faster (8.7 +/- 2.2 cm/year) than males (6.4 +/- 2.6 cm/year), and the growth rate slowed in the older eels. The growth rate of A. japonica at all three sites was much faster than that of other temperate anguillid species (<4 cm/year), and their age at maturation was younger than that of other temperate species (similar to 7 to >50 years), suggesting this species has important ecological differences from other similar species.
机译：在位于日本三个不同纬度（天草群岛，米尔卡瓦湾和三陆海岸）的采集点之间，对597种黄色和银色阶段的日本鳗，的生态特征进行了检查和比较，以提供有关这种异常cat鱼的基础数据种类。对鳗进行了性别分析，并根据耳石分析了鳗鱼的总长度，体重，年龄和生长率，并对性别，阶段和采集地点进行了比较。总体性别比例偏爱女性（94％），但三个地区之间的性别比例有所不同。在北部三陆的沿海水域，雌性鱼类的发病率最高（100％），在日本中部的三川湾次之（95％），其次是南部的天草群岛（70％）。雄性银e的长度为41.2-66.3厘米，年龄为4-10岁，雌性银silver的长度为44.3-97.2厘米，年龄为5-17岁。雌鳗的生长速度（8.7 +/- 2.2厘米/年）通常快于雄鳗（6.4 +/- 2.6厘米/年），老鳗的生长速度减慢。在所有三个位置上，粳稻的生长速度都快于其他温带刺种（<4 cm /年），它们的成熟年龄比其他温带种还年轻（大约7至> 50岁） ），表明该物种与其他相似物种具有重要的生态差异。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号