Light trap and larval trawl collection of bigheaded carp in the Missouri River Basin, 2016

In the Lamine, Moreau, and Little Chariton rivers, light traps were used to capture larval bigheaded carps moving into tributaries. Traps were set on a weekly basis in each river, at roughly 1-kilometer intervals up to 7 km upstream. Ichthyoplankton tows were done in locations near the confluence of each tributary with the Missouri River, and within the Missouri River itself. Data includes identification of larval fish, size, and developmental information of subsampled invasive carp species. Flow readings were taken at up to five points across the channel with a Marsh-McBirney flow meter, and water quality was measured at the surface with a YSI ProPlus before retrieval of light traps.

本研究在莱米内河（Lamine）、莫罗河（Moreau）以及小查里顿河（Little Chariton）中，采用灯光诱捕器捕获洄游进入支流的鳙幼鱼。研究人员在每条河流中每周布设一次诱捕器，布设间距约1公里，最远布设至上游7公里处。在各支流与密苏里河（Missouri River）的汇流附近水域以及密苏里河干流内开展了鱼卵仔鱼拖网采样作业。采集的数据涵盖鱼类幼体的物种鉴定、体长测量结果，以及子采样入侵鲤科鱼类的发育阶段信息。研究人员使用Marsh-McBirney型流速仪，在河道内最多5个测点获取流速数据；并在回收灯光诱捕器前，使用YSI ProPlus型水质分析仪测定表层水体水质。