Design and Performance of a Digital Video Monitoring Station Incorporated in a V-Shaped Resistance Board Weir. Alaska Fisheries Technical Report Number 91

摘要

The King Salmon Fish and Wildlife Field Office operated a fish counting weir on Big Creek to monitor Pacific salmon Oncorhynchus spp. escapement from 2000 to 2004. This study was also used as a platform to modify weir designs to minimize impacts to anadromous and resident fish species. A modified resistance board weir was constructed and installed in a V-shaped formation that directs upstream migrant fish to a live trap and video passage chute positioned at the apex of the V. An underwater video monitoring station was incorporated into the weir that used a digital video recorder and motion detection algorithms to record high quality images of fish passage. The ability to replay video files repeatedly in slow motion and to pause on individual frames allows reviewers to accurately identify species, identify individuals within groups, and determine direction of travel. The video system also functions well in turbid water, and has removed much of the variability associated with observation conditions that can affect the accuracy of live counts.