• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of great lakes research >Relative Survival of Lake Trout Stocked at Different Sizes and Quality in Lake Michigan
【24h】

Relative Survival of Lake Trout Stocked at Different Sizes and Quality in Lake Michigan

机译：密歇根湖不同规格和质量的鳟鱼湖的相对生存

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

Beginning in 1995, the size of yearling lake trout (Salvelinus namaycush) stocked into the upper Great Lakes was increased based on the assumption that these fish would be healthier and survive better since natural mortality is thought to be inversely proportional to body size. We compared the post-release, relative survival of paired stockings of lake trout reared to 44 fish/kg (standard size) with larger fish reared to 22-26 fish/kg (enhanced size) in Lake Michigan. About 60,000 lake trout each of the standard and enhanced sizes for the 1994-1997 year classes were released as yearlings in spring near Clay Banks Reef, Wisconsin, and identified with coded-wire tags and an adipose fin-clip. Recaptures were made from 1997 to 2003 in four gill net surveys conducted in spring and fall near the release location. Comparisons of catch-per-unit of effort corrected for numbers stocked generally indicated no significant differences in relative survival of standard and enhanced lake trout. An autopsy-based assessment of overall fish health and condition indicated few measures where significantly different between standard and enhanced lake trout prior to stocking. Size differences between standard and enhanced fish remained statistically significant at all observed ages at recapture; however growth rates were the same for the two groups. Stocking numbers at certain sites on Lake Michigan were reduced concurrent with the change to larger yearlings with the expectation of increased survival, which did not occur; hence recruitment was essentially reduced in these areas for the restoration program.
机译：从1995年开始，由于认为自然死亡率与体重成反比，因此假定这些鱼类更健康，生存得更好的假设是，增加了大湖上游一岁鳟鱼（Salvelinus namaycush）的体型。我们比较了密歇根湖放养的鳟鱼成对放养后相对存活率，将其养成44条鱼/千克（标准尺寸），将较大的鱼养成22-26条鱼/千克（增强型）。作为一岁一岁的一岁一岁的小鳟鱼，在1994年至1997年春季在威斯康星州的克莱班克斯礁附近发布，并用编码标签和脂肪鳍夹识别。从1997年至2003年，在春季和秋季在释放地点附近进行的四次刺网调查中重新捕获。校正的种群数量校正的单位捕捞量的比较通常表明标准鳟鱼和增强型鳟鱼的相对存活率没有显着差异。对鱼类总体健康和状况进行的基于尸检的评估表明，在放养之前，标准鳟鱼和增强型鳟鱼之间几乎没有明显差异。在重新观察到的所有观察年龄，标准鱼和改良鱼之间的大小差异仍具有统计学意义；但是两组的增长率相同。密歇根湖某些地点的放养数量减少了，同时随着对一岁鸡的更换，预期存活率会提高，但这种情况并未发生；因此，从本质上来说，这些地区的恢复计划的招募减少了。

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