Assessment of the Counting Accuracy of the Vaki Infrared Counter on Chum Salmon

摘要: Abstract Vaki, Ltd., of Iceland has designed a system for counting the in-river migration salmonids via infrared sensors. The Vaki fish counter is used in Iceland, United Kingdom, and Europe but much less North America partly because system's unknown ability to count large populations accurately. In tests Big Qualicum River Vancouver Island, British Columbia, we found accuracy be inversely correlated with rate chum salmon Oncorhynchus keta. was very accurate (>95%) rates than 500 fish/h declined 76% at exceeding 1,500 fish/h. principal cause decline inability sensors passage more one simultaneously.