Johnson Nicholas S, Miehls Scott M, Haro Alex J, Wagner C Michael
Hammond Bay Biological Station, U.S. Geological Survey, Great Lakes Science Center, 11188 Ray Road, Millersburg, MI 49759, USA.
S.O. Conte Anadromous Fish Research Laboratory, U.S. Geological Survey, Leetown Science Center, 1 Migratory Way, Turners Falls, MA 01376, USA.
Conserv Physiol. 2019 Oct 29;7(1):coz080. doi: 10.1093/conphys/coz080. eCollection 2019.
Visual and olfactory stimuli induce behavioural responses in fishes when applied independently, but little is known about how simultaneous exposure influences behaviour, especially in downstream migrating fishes. Here, downstream moving juvenile sea lamprey () were exposed to light and a conspecific chemosensory alarm cue in a flume and movement were monitored with overhead cameras and nets. When exposed to light, sea lamprey were more likely to be captured in a net closest to the light array. When exposed to the alarm cue, sea lamprey transit rate through the flume increased, but sea lamprey did not avoid the alarm cue plume by moving perpendicular to flow. When the alarm cue and light were applied simultaneously in a push and pull configuration, the alarm cue still triggered enhanced downstream movement (push downstream) and more sea lamprey was still captured in the net nearest the light (pull to the side), resulting in twice as many sea lamprey being captured in the lighted net relative to controls. To our knowledge, this is the first study using multiple sensory cues in a push-pull configuration to modulate fish outmigration. Push and pull of juvenile sea lamprey with sensory cues could be useful to reduce turbine entrainment where native and enhance trap catch where invasive.
视觉和嗅觉刺激单独作用于鱼类时会引发行为反应，但对于同时暴露于这两种刺激下如何影响行为，尤其是对下游洄游鱼类的影响，人们了解甚少。在此，将向下游游动的幼年海七鳃鳗置于水槽中，使其暴露于光线和同种化学感应警报信号下，并用头顶的摄像头和鱼网监测其活动。当暴露于光线时，海七鳃鳗更有可能在最靠近光源阵列的鱼网中被捕获。当暴露于警报信号时，海七鳃鳗通过水槽的游动速度加快，但它们不会通过垂直于水流方向游动来避开警报信号羽流。当警报信号和光线以推挽配置同时施加时，警报信号仍会触发增强的下游游动（向下游推），并且更多的海七鳃鳗仍会在最靠近光源的鱼网中被捕获（向一侧拉），导致在有光照的鱼网中捕获的海七鳃鳗数量相对于对照组增加了一倍。据我们所知，这是第一项使用推挽配置的多种感官线索来调节鱼类洄游的研究。利用感官线索对幼年海七鳃鳗进行推挽操作，可能有助于减少本地鱼类被涡轮机吸入的情况，并增加入侵鱼类在陷阱中的捕获量。
