...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Ichthyology >Long-Term Variation in Dates of Mass Spawning of Cod Gadus morhua callarias (Gadidae) in the Southeastern Part of the Baltic Sea
【24h】

Long-Term Variation in Dates of Mass Spawning of Cod Gadus morhua callarias (Gadidae) in the Southeastern Part of the Baltic Sea

机译：波罗的海东南部鳕鱼（Gadidae morhua callarias）的大规模产卵日期的长期变化

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

Long-term data on the numbers of eggs of cod Gadus morhua callarias in ichthyoplankton and the seasonal variation of their distribution in the Gdansk Deep of the Baltic Sea are considered. The spring peak of spawning was observed for the years 1948-1954 and 1960-1964; the spring-summer peak for 1968-1977; and the summer peak for 1955-1959 and 1995-2001. Maximum egg numbers of cod were recorded from the late 1940s to the early 1950s; minimums were recorded in the late 1980s and the late 1990s. The decrease in the numbers of cod eggs in the ichthyoplankton, in general, coincided with a decrease in the proportion of spawners maturing at the beginning of the season of mass reproduction and a decrease in the oxygen content in the near-bottom layer of the Gdansk Deep. It is suggested that a shift of the spawning peak of cod from spring to summer is related to a decrease in the volume of near-bottom waters providing favorable conditions for the reproduction of this population.
机译：考虑了浮游鱼类鳕鱼Gadus morhua callarias的卵数及其在波罗的海格但斯克深处的分布的季节性变化的长期数据。在1948-1954年和1960-1964年观察到了产卵的春季高峰。 1968-1977年的春夏季高峰; 1955-1959年和1995-2001年是夏季高峰。从1940年代末到1950年代初记录了鳕鱼的最大卵数。最低记录发生在1980年代末和1990年代末。通常，鱼鳞浮游生物中鳕鱼卵数量的减少与在大量繁殖季节开始时成熟的产卵者比例的减少以及格但斯克近底层的氧气含量的降低相吻合。深。有人认为，鳕鱼产卵高峰从春季到夏季的变化与近底部水域的减少有关，为该种群的繁殖提供了有利条件。

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