• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine ecology progress series >Temperature and depth preferences of adult sea trout Salmo trutta during the marine migration phase
【24h】

Temperature and depth preferences of adult sea trout Salmo trutta during the marine migration phase

机译：成年海鳟在迁徙阶段的温度和深度偏好

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

We tagged 125 sea trout kelts (length: 460-925 mm) in Danish rivers with positively buoyant, depth-and temperature-sensing data storage tags. Eight tags were recovered from fish that had completed a full marine cycle (exit and return to natal river). Mean duration of the postestuary marine cycle was 96.1 d (range: 47-142 d). The trout resided at depths of 0-3 m for 63.8% of the time and exhibited a characteristic diurnal behavioural pattern with repetitive dives deeper than 5.0 m during daytime and residency at the surface during night-time. The number of dives increased with day length, but dive duration was unaffected. Mean dive duration increased with water temperatures from 9.79 min at 5-7 degrees C to 79.8 min at 17-19 degrees C, and mean residence depth increased with water temperatures from 1.95 m at 5-7 degrees C to 10.1 m at 17-19 degrees C. The fish showed a marked response to temperatures above 17 degrees C by residing at greater depths and by discontinuing the characteristic dive/surface residency pattern for prolonged periods of time during warm periods. Temperature data indicated that the fish were generally close to land in the beginning of the marine period and had migrated into open sea during summer. Our results suggest that Danish sea trout kelts aim to optimize their growth at sea by exhibiting a characteristic foraging pattern similar to that of Atlantic salmon and by seeking temperatures within the range reported as optimal for growth in the species.
机译：我们在丹麦河流中为125只鳟鱼海带（长度：460-925毫米）加了正浮力的深度和温度感应数据存储标签。从完成了整个海洋周期（退出并返回新生河）的鱼中回收了八个标签。出海口海洋周期的平均持续时间为96.1 d（范围：47-142 d）。鳟鱼在0-3 m的深度停留了63.8％的时间，并表现出典型的昼夜行为模式，白天白天重复潜水深度超过5.0 m，晚上在地面停留。潜水次数随日长的增加而增加，但潜水时间不受影响。平均潜水时间随着水温从5-7摄氏度的9.79分钟增加到17-19摄氏度的79.8分钟，并且平均停留深度随着水温从5-7摄氏度的1.95 m增加到17-19的10.1 m通过驻留在更深的深度并在温暖的时期内长时间中断特征性的潜水/水面居住模式，鱼对17摄氏度以上的温度表现出明显的响应。温度数据表明，鱼类在海洋时期初期通常靠近陆地，并在夏季移入公海。我们的结果表明，丹麦海鳟kelts旨在通过表现出与大西洋鲑鱼相似的特征性觅食方式，并在被报道为该物种最佳生长范围内寻找温度，以优化其在海上的生长。

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