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Activity Patterns of Anadromous Fish below a Tide Gate: Observations from High‐Resolution Imaging Sonar
Marine and Coastal Fisheries ( IF 1.7 ) Pub Date : 2021-05-06 , DOI: 10.1002/mcf2.10149
Christopher B. Rillahan 1 , Derrick Alcott 2 , Theodore Castro‐Santos 3 , Pingguo He 1
Affiliation  

The construction of dams and tide gates on waterways has altered the physical structure of many coastal, estuarine, and freshwater systems. These changes have come at a cost to fish populations, most notably diadromous species, which rely on connectivity between marine and freshwater systems. These anthropogenic structures can have direct effects on migrating fish, such as blocking fish passage, or have more subtle effects, such as changing movement patterns. This study used a high‐resolution Adaptive Resolution Imaging Sonar to examine the behavior of Striped Bass Morone saxatilis, a large coastal predator, and Alewife Alosa pseudoharengus and Blueback Herring Alosa aestivalis (collectively known as river herring), which are forage fish, below a tide gate structure on the Herring River in Wellfleet, Massachusetts, during the river herring spring spawning run. Striped Bass were persistently present downstream of the tide gate and exhibited strong diurnal and tidal patterns. Activity of Striped Bass was highest at night and during ebb tides. During peak outflow periods, river herring were observed milling downstream of the dam in a scour pool, indicating delayed upstream passage. River herring upstream migration was primarily associated with daytime and during incoming tides. Downstream‐migrating river herring were primarily observed during nighttime hours. While it was documented that the tide gates provided a physical impediment to migration, their effect on predator behavior could pose an additional challenge to migrating river herring, further complicating their recovery efforts. Due to the prevalence of obstructed waterways, studying the behavior of fish around anthropogenic structures is important in understanding the full range of impacts that these systems have under varying ecological conditions and on ecological relationships.

中文翻译:

潮汐闸门以下无鳍鱼的活动模式:高分辨率成像声纳的观察

在水道上建造水坝和潮汐闸门已经改变了许多沿海,河口和淡水系统的物理结构。这些变化是以鱼类种群为代价的,最显着的是鱼类,这取决于海洋和淡水系统之间的连通性。这些人为结构可以对迁移的鱼类产生直接影响,例如阻止鱼类通过,或者具有更细微的影响,例如改变运动方式。这项研究使用高分辨率的自适应分辨率成像声纳来检查条纹鲈鱼Morone saxatilis,大型沿海捕食者以及Alewife Alosa pseudoharengus和Blueback Herring Alosa aestivalis的行为。(统称为河鲱鱼),是草食鱼,位于河鲱鱼春季产卵期间位于马萨诸塞州韦尔弗利特(Wellfleet)鲱鱼河上的潮汐闸门结构下方。条纹鲈鱼持续存在于潮汐闸门的下游,并表现出强烈的昼夜和潮汐模式。条纹鲈鱼的活动在夜间和退潮期间最高。在高峰流出期间,观察到在鲱鱼冲刷池下游大坝下游碾磨出河鲱鱼,表明上游通行延迟。河鲱鱼的上游迁移主要与白天和来潮有关。主要在夜间观察到下游迁移的鲱鱼。据记载,潮汐闸门为迁徙提供了物理障碍,它们对捕食者行为的影响可能会给迁移河鲱带来新的挑战,使他们的恢复工作更加复杂。由于水道受阻,研究人为结构周围鱼类的行为对于理解这些系统在变化的生态条件下以及对生态关系的全面影响非常重要。
更新日期:2021-05-07
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