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年轻的大西洋鱼在活跃的头吸疏附近的生存和移动情况
Matthew Balazik1,2, Douglas Clarke3
1Engineer Research and Development Center, United States Army Corps of Engineers, Vicksburg, MS, United States of America.
PloS one
|November 27, 2024
概括
幼年大西洋 (Acipenser oxyrinchus oxyrinchus) 没有避免积极的疏和通过低死亡风险的操作. 这一发现有助于在河流维护期间减轻这个危物种的威胁.
科学领域:
- 海洋生物学 海洋生物学
- 保护科学 保护科学
- 渔业管理 渔业管理 渔业管理
背景情况:
- 大西洋 (Acipenser oxyrinchus oxyrinchus) 种群已经大幅减少.
- 知识差距阻碍了对该物种有效的威胁减轻和恢复工作.
- 河道维护疏对幼鱼的生存构成潜在威胁.
研究的目的:
- 评估青少年大西洋鱼的生存和运动行为,与活动道维护疏相关.
- 为了确定幼是否表现出避开行为在切头吸疏.
- 在疏操作期间为大西洋鱼的保护策略提供信息.
主要方法:
- 在弗吉尼亚州的詹姆斯河捕获和声学标记268只幼年大西洋 (30-71厘米叉长).
- 通过远程测量监测鱼的移动情况,靠近活跃的头吸.
- 在疏地点和参考地点之间比较每单位捕捞量 (CPUE).
- 评估鱼的存在和存活100米下游的活跃疏超过一个月.
主要成果:
- 幼年大西洋鱼被检测到在95-145米的活跃疏范围内食和移动.
- 在疏和参考地点之间没有观察到CPUE的显著差异.
- 遥测数据显示,被标记的青少年至少完成了125次的疏操作,没有死亡.
- 所有被标记的幼都留在河里,在疏工作停止后被发现.
结论:
- 年龄1-2岁 大西洋鱼不表现出避免活动疏区域的行为,直至100米.
- 年轻的大西洋鱼可以通过活跃的疏操作,死亡风险低.
- 这些发现支持继续道维护疏,预计对年轻大西洋鱼生存的影响最小.
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