...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>North American Journal of Fisheries Management >Mortality of largemouth bass during catch-and-release tournaments in a Puerto Rico reservoir
【24h】

Mortality of largemouth bass during catch-and-release tournaments in a Puerto Rico reservoir

机译：在波多黎各水库的擒拿式比赛中大嘴鲈的死亡率

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

In Puerto Rico, unique protocols are used during fishing tournaments for largemouth bass Micropterus salmoides. Live wells are not required, and many anglers retain their catch on metal stringers. During day tournaments, fish are collected and weighed by a roving weigh-in bout; night tournaments use a central weigh-in station. We monitored 15 fishing tournaments over I year in Lucchetti Reservoir, Puerto Rico, to quantify mortality rates and to evaluate the impact of tournaments on the adult fish population. Initial mortality was documented at weigh-in, and delayed mortality was determined by holding largemouth bass for 4 d in floating mesh pens with control (electrofished) largemouth bass. Initial and delayed mortality averaged 8% (range, 0-38%) and 43% (10-98%), respectively. The delayed mortality rate was adjusted by the control mortality rate (mean, 7%; range, 0-50%) for each tournament to yield adjusted delayed mortality rate (mean, 36%; range, 10-68%), which we used to calculate total mortality rate (mean, 42%; range, 13-68%). Although surface water temperature ranged only between 23degreesC and 28degreesC, total mortality was significantly lower (P less than or equal to 0.05) during January-February, being positively correlated with temperature. Night tournaments experienced significantly greater total mortality rates than day tournaments, most likely because of the eightfold longer retention of bass before weigh-in during night tournaments. Retention time was positively correlated with initial mortality rates. We estimated that tournament mortality removed 6% of the adult largemouth bass population and accounted for 23% of all fishing mortality. We recommended reducing tournament fishing during hotter, high-mortality periods; modification of night tournaments; and use of well-maintained live wells. Combined with angler education, such modifications of tournament procedures can reduce the impact of tournaments in tropical reservoirs.
机译：在波多黎各，大嘴鲈鱼Micropterus salmoides的钓鱼比赛中使用了独特的协议。不需要活井，许多垂钓者将其捕获物保留在金属纵梁上。在日间比赛中，将鱼收集起来并用粗纱称重称重;夜间比赛使用中央称重站。我们在一年多的时间里监视了波多黎各卢克切蒂水库的15个钓鱼比赛，以量化死亡率并评估比赛对成年鱼类种群的影响。在称重时记录了初始死亡率，通过在带有对照（电钓）大嘴鲈鱼的浮动网眼笔中将大嘴鲈鱼保持4 d来确定延迟死亡率。初始和延迟死亡率分别为8％（范围：0-38％）和43％（10-98％）。通过每次比赛的控制死亡率（平均7％;范围0-50％）调整延迟死亡率，以产生调整后的延迟死亡率（平均36％;范围10-68％），我们使用了计算总死亡率（平均值为42％;范围为13-68％）。尽管地表水温度仅在23摄氏度至28摄氏度之间变化，但在1月至2月期间，总死亡率显着降低（P小于或等于0.05），与温度呈正相关。夜间比赛的总死亡率比白天比赛要高得多，这很可能是因为夜间比赛之前在称重之前低音保持时间延长了八倍。保留时间与初始死亡率呈正相关。我们估计，比赛死亡率使成年大嘴鲈减少了6％，占所有捕鱼死亡率的23％。我们建议在炎热的高死亡率时期减少比赛钓鱼;修改夜间比赛;以及使用维护良好的活井。结合钓鱼者教育，对比赛程序的此类修改可以减少比赛对热带水库的影响。

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