Asian carps continue to expand their range in North America, necessitating efforts to limit the spread and establishment of reproducing populations. Mississippi River Lock and Dam 19 is a high-head dam that represents a population ‘pinch-point’ as passage through the lock chamber is the only means by which fishes can complete upstream movement. As such, this location could be a pivotal control point for minimizing the spread of invasive fishes in the Upper Mississippi River and a possible candidate site for installation of deterrent measures. Our objectives were (1) to study the timing (i.e., weekly and diel) and behavior of fishes in the downstream lock approach, (2) evaluate the relation of presence in the downstream lock approach with environmental factors and lock operation, and (3) identify any upstream or downstream passage events through the lock chamber and the relation between these events and the operation of the lock. Acoustic transmitters were surgically implanted into 262 Asian carps and 216 native fishes to monitor fish activity on a telemetry receiver array deployed around and within the lock for 622 days during 2017–2018. One hundred eighty-six telemetered fish were detected in the downstream lock approach. We documented 14 upstream Asian carp passages and 10 upstream native fish passages; these passages coincided with a specific sequence of large vessel lockages. The results of this study advance our understanding of fish presence and behavior at a Mississippi River mainstem lock and dam and inform the development and testing of deterrent systems at this location or at similar pinch-point lock and dams.

亚洲鲤鱼在北美的范围不断扩大，因此必须努力限制其扩散和繁殖种群的建立。密西西比河锁和水坝19是高头水坝，代表种群的“捏点”，因为穿过锁室是鱼类完成上游运动的唯一途径。因此，该地点可能是关键控制点，可最大程度地减少密西西比河上游的入侵鱼类的扩散，并可能是采取威慑措施的候选地点。我们的目标是（1）研究下游锁定方法中鱼类的时机（即每周和迪尔）和行为，（2）评估下游锁定方法中鱼类的存在与环境因素和锁定操作之间的关系，（3）识别通过锁室的任何上游或下游通过事件，以及这些事件与锁的操作之间的关系。在2017-2018年期间，将声发射器通过外科手术植入了262条亚洲鲤鱼和216条本地鱼类中，以监测在锁周围和内部部署的遥测接收器阵列上的鱼类活动，为期622天。在下游锁定方法中检测到186条遥测鱼。我们记录了14条亚洲鲤鱼上游种群和10条上游本地鱼类种群。这些通道与大型船只锁定的特定顺序相吻合。这项研究的结果使我们对密西西比河主干闸和水坝中鱼类的存在和行为有了更深入的了解，并为该地点或类似夹点闸和水坝的威慑系统的开发和测试提供了信息。