Author: Matthew D. MethenyPublisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 180
Book Description
Use of Dual Frequency Identification Sonar to Estimate Salmonid Escapement to Redwood Creek, Humboldt County, California
Author: Matthew D. MethenyPublisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 180
Book Description
Feasibility of Deploying a Dual-frequency Identification Sonar (DIDSON) System to Estimate Salmon Spawning Ground Escapement in Major Tributary Systems of the Fraser River, British Columbia
Author: John A. HolmesPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 0
Book Description
Use of Dual Frequency Identification Sonar to Determine Adult Chinook Salmon (Oncorhynchus Tshawytscha) Escapement to the Secesh River, Idaho
Author: Paul KuceraPublisher:
ISBN:
Category : Chinook salmon fisheries
Languages : en
Pages : 0
Book Description
Use of Dual-frequency Identification Sonar to Verify Split-beam Estimates of Salmon Flux and to Examine Fish Behaviour in the Fraser River
Author: Yunbo XiePublisher:
ISBN:
Category : Echo sounding in fishing
Languages : en
Pages : 68
Book Description
Use of Dual Frequency Identification Sonar to Determine Adult Chinook Salmon (Oncorhynchus Tshawytscha) Escapement to the Secesh River, Idaho
Author: Paul A. KuceraPublisher:
ISBN:
Category : Chinook salmon fisheries
Languages : en
Pages : 67
Book Description
Use of Dual Frequency Identification Sonar to Determine Adult Chinook Salmon (Oncorhynchus Tshawytscha) Escapement to the Secesh River, Idaho
Author: Paul A. KuceraPublisher:
ISBN:
Category : Chinook salmon fisheries
Languages : en
Pages : 67
Book Description
Feasibility of Deploying a Dual-frequency Identification Sonar (DIDSON) System to Estimate Salmon Spawning Ground Escapement in Major Tributary Systems of the Fraser River, British Columbia
Author: Canada. Dept. of Fisheries and OceansPublisher: Nanaimo, B.C. : Fisheries and Oceans Canada
ISBN:
Category : Chinook salmon
Languages : en
Pages : 51
Book Description
Use of Dual Frequency Identification Sonar to Determine Adult Chinook Salmon (Oncorhynchus Tshawytscha) Escapement in the Secesh River, Idaho ; Annual Report, January 2008 - December 2008
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 77
Book Description
Chinook salmon in the Snake River basin were listed as threatened under the Endangered Species Act in 1992 (NMFS 1992). The Secesh River represents the only stream in the Snake River basin where natural origin (wild) salmon escapement monitoring occurs at the population level, absent a supplementation program. As such the Secesh River has been identified as a long term salmon escapement and productivity monitoring site by the Nez Perce Tribe Department of Fisheries Resources Management. Salmon managers will use this data for effective population management and evaluation of the effect of conservation actions on a natural origin salmon population. The Secesh River also acts as a reference stream for supplementation program comparison. Dual frequency identification sonar (DIDSON) was used to determine adult spring and summer Chinook salmon escapement in the Secesh River in 2008. DIDSON technology was selected because it provided a non-invasive method for escapement monitoring that avoided listed species trapping and handling incidental mortality, and fish impedance related concerns. The DIDSON monitoring site was operated continuously from June 13 to September 14. The first salmon passage was observed on July 3. DIDSON site total estimated salmon escapement, natural and hatchery fish, was 888 fish ± 65 fish (95% confidence interval). Coefficient of variation associated with the escapement estimate was 3.7%. The DIDSON unit was operational 98.1% of the salmon migration period. Adult salmon migration timing in the Secesh River occurred over 74 days from July 3 to September 14, with 5,262 total fish passages observed. The spawning migration had 10%, median, and 90% passage dates of July 8, July 16, and August 12, respectively. The maximum number of net upstream migrating salmon was above the DIDSON monitoring site on August 27. Validation monitoring of DIDSON target counts with underwater optical cameras occurred for species identification. A total of 860 optical camera identified salmon passage observations were identical to DIDSON target counts. However, optical cameras identified eight jack salmon (3 upstream, 5 downstream) less than 55 cm in length that DIDSON did not count as salmon because of the length criteria employed (e"55 cm). Precision of the DIDSON technology was evaluated by comparing estimated net upstream salmon escapement and associated 95% confidence intervals between two DIDSON sonar units operated over a five day period. The DIDSON 1 salmon escapement was 145.7 fish (± 2.3), and the DIDSON 2 escapement estimate was 150.5 fish (± 5). The overlap in the 95% confidence intervals suggested that the two escapement estimates were not significantly different from each other. Known length salmon carcass trials were conducted in 2008 to examine the accuracy of manually measured lengths, obtained using DIDSON software, on high frequency files at a 5 m window length. Linear regression demonstrated a highly significant relationship between known lengths and manually measured salmon carcass lengths (p
Sonar Estimation of Fall Chum Salmon Abundance in the Sheenjek River, 2007
Author: Roger D. DunbarPublisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 34
Book Description
This reports on the Dual-Frequency Identification Sonar (DIDSON), which was used to estimate chum salmon, Oncorhynchus keta, escapement in the Sheenjek River from August 11 to September 24, 2007.
Sonar Estimation of Fall Chum Salmon Abundance in the Sheenjek River, 2005
Author: Roger D. DunbarPublisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 38
Book Description
This reports on the Dual-Frequency Identification Sonar (DIDSON), which was used to estimate chum salmon, Oncorhynchus keta, escapement in the Sheenjek River from August 10 to September 24, 2005. This was the first season that DIDSON was used to estimate chum salmon passage in the Sheenjek River, and the first season that both banks were fully monitored since 1987.