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首页> 美国政府科技报告 >Evaluation of Sonar for Enumeration of Chinook Salmon in the Chandalar River, Yukon Flats National Wildlife Refuge, Alaska, 2004-2006. Alaska Fisheries Data Series Number 2008-1
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Evaluation of Sonar for Enumeration of Chinook Salmon in the Chandalar River, Yukon Flats National Wildlife Refuge, Alaska, 2004-2006. Alaska Fisheries Data Series Number 2008-1

机译：2004 - 2006年，阿拉斯加育空平原国家野生动物保护区Chandalar河中计算奇诺克三文鱼的声纳评估。阿拉斯加渔业数据系列号2008-1

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We evaluated the potential for using fixed-location sonar to estimate Chinook salmon Oncorhynchus tshawytscha abundance in the Chandalar River, Alaska. Two types of sonar were evaluated: Dual Frequency Identification Sonar and split-beam sonar. Site evaluation was completed during 2004. During 2005, 1,433 hours (64 percent of the possible hours) of DIDSON data were collected, resulting in an upriver swimming fish count of 5,591. During 2006, 1,372 hours (75 percent of the possible hours) of data were collected with split-beam sonar, and 1,527 hours (84 percent of the possible hours) with DIDSON, providing two independent counts of upriver swimming fish, 13,822 for split-beam sonar and 32,609 for DIDSON. The majority of the missed time during both years was a result of high water. Fish were shore oriented. Hourly passage rates of upriver fish showed a diel pattern at most of the deployment locations, with more fish passing in the morning and evening hours. Beach seining and gill netting indicated that chum salmon O. keta and Chinook salmon were present in the river during July. We were unable to distinguish between the different salmon species present using DIDSON or split-beam sonar; therefore, we were unable to obtain an accurate estimate of Chinook salmon abundance.

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