Download or read book Evaluation of a Dual frequency Imaging Sonar for Detecting and Estimating the Size of Migrating Salmon written by Debby L. Burwen and published by . This book was released on 2007 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments were conducted with a DIDSON (Dual frequency IDentification SONar) acoustic system to evaluate the potential for estimating fish size from images of tethered and free-swimming fish in two Alaskan rivers.

Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 2014 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Use of Dual frequency Identification Sonar to Verify Split beam Estimates of Salmon Flux and to Examine Fish Behaviour in the Fraser River written by Yunbo Xie and published by . This book was released on 2005 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Feasibility of Estimating Migrating Salmon Passage Rates in Turbid Rivers Using a Dual Frequency Idenfication Sonar DIDSON 2002 written by Suzanne L. Maxwell and published by . This book was released on 2004 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes testing of a dual frequency idenfication sonar (DIDSON) to count migrating adult salmon in turbid Alaskan rivers as a replacement for Bendix echo counting sonars.

Download or read book Kenai and Kasilof River Sockeye Salmon Inriver Passage and Escapement Studies 2022 2024 written by William J. Glick and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dual-frequency Identification Sonar (DIDSON; Belcher et al. 2002) is used annually to estimate sockeye salmon Oncorhynchus nerka passage into the Kenai River of Upper Cook Inlet (UCI), Alaska (Figure 1). Adaptive Resolution Imaging Sonar (ARIS) is used to estimate sockeye salmon passage into the Kasilof River. Both multi-beam sonar systems are manufactured by Sound Metrics Corporation with ARIS being an upgraded replacement of the DIDSON. Sonar passage estimates of sockeye salmon are used for inseason management of UCI commercial fisheries, as well as personal use fisheries in the Kenai and Kasilof rivers, to achieve established escapement goals and inriver run goals. The current sustainable escapement goal (SEG) for sockeye salmon in the Kenai River is 750,000–1,300,000 fish. The inriver goal for sockeye salmon in the Kenai River is 1,000,000–1,200,000 fish if the forecasted return estimate is 2,300,000; 1,100,000–1,400,000 fish for a forecasted return of 2,300,000–4,600,000; and 1,200,000–1,600,000 fish for a forecasted return of 4,600,000 (Marston and Frothingham In prep). The Kasilof River optimal escapement goal (OEG) is 140,000–370,000 sockeye salmon, with a biological escapement goal (BEG) of 140,000–320,000. (McKinley et al. 2020). Fish wheels are used to capture migrating salmon for 1) species apportionment; 2) to estimate age, length, and sex composition of the sockeye salmon escapement; and, 3) to collect genetic samples as needed. Historical sonar passage and escapement data for the Kenai and Kasilof rivers (Table 1) is provided in yearly Regional Information and Fishery Data Series reports as exhibited by Glick and Marston (In prep). This plan outlines how sonar sampling and logistical operations will be conducted for each of these sonar enumeration sites.

Download or read book Estimating Proportion of Large Salmon on Harry s River Newfoundland Using a DIDSON Acoustic Camera written by Geoffrey Veinott and published by . This book was released on 2016 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaulating Error in Sockeye Salmon Abundance Estimates from Salmon Migrating Outside the Sonar Beam at the Yentna Cooper and Kenai Rivers written by Suzanne L. Maxwell and published by . This book was released on 2013 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dual-frequency identification sonars (DIDSONs) are used at several sites in Alaska to assess Pacific salmon Oncorhynchys spp. escapement. This study examined one potential error source associated with this method, the number of fish migrating outside the ensonified region.

Download or read book Evaulating Error in Sockeye Salmon Abundance Estimates from Salmon Migrating Outside the Sonar Beam at the Yentna Cooper and Kenai Rivers written by Suzanne L. Maxwell and published by . This book was released on 2013 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dual-frequency identification sonars (DIDSONs) are used at several sites in Alaska to assess Pacific salmon Oncorhynchys spp. escapement. This study examined one potential error source associated with this method, the number of fish migrating outside the ensonified region.

Download or read book Assessment of a Dual frequency Identification Sonar DIDSON for Application in Fish Migration Studies written by Lee J. Baumgartner and published by . This book was released on 2005 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Methods Used to Apportion Sonar Counts to Species at the RM19 Kenai River Sonar Site 2016 written by T. Mark Willette and published by . This book was released on 2018 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: DIDSON (dual-frequency identification sonar) is used to estimate the number of sockeye salmon Oncorhynchus nerka passing river mile (RM) 19 on the Kenai River of Upper Cook Inlet Alaska. DIDSON data are used to estimate the total number of salmon passing the sonar site, and north bank fish wheel catches are typically used to estimate the proportion of the total sonar count comprised of sockeye salmon when pink salmon O. gorbuscha are abundant in August. This project evaluated the efficacy of using other fishing methods (i.e. anchored gillnets, drift gillnets, and beach seines) to apportion sonar counts to species when large numbers of pink salmon were passing the RM19 sonar site in August, 2016. Due to landownership issues and the presence of sport fishermen, only drift gillnets were fished on the south bank. Logistic regression was used to model the proportion of sockeye salmon along the south bank using the proportion of sockeye salmon in north bank fish wheel catches as the independent variable. Six species apportionment methods were evaluated. Sockeye salmon passage estimated using the standard fish wheel apportionment method was not significantly different from passage estimated using combined anchored gillnet and seine data to apportion sonar counts. Sockeye salmon passage estimated using the standard method was significantly higher than passage estimated using the other 4 alternative apportionment methods, but passage estimates using these alternative methods were 1.2% to 4.7% lower than estimates obtained using the standard method. Due to various problems encountered when fishing with gillnets and seines at the Kenai RM19 sonar site, we recommend that fish wheels continue to be used for species apportionment and that modeled species proportions based on north bank fish wheel catches be used to apportion south bank DIDSON counts.

Download or read book Estimating Salmon Abundance in the Kuskokwim River Using Sonar 2016 written by Keegan O. Birchfield and published by . This book was released on 2019 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 3-year study was initiated in 2014 to assess the feasibility of using sonar, in combination with drift gillnetting, to estimate salmon abundance in the Kuskokwim River. This report presents the results of the final year of feasibility assessment in 2016. After identifying a location with a suitable bottom profile, split-beam and imaging sonars were deployed on the gentle sloping left bank and an imaging sonar was deployed on the steep right bank. A range of drift gillnet mesh sizes were deployed along both banks to apportion sonar counts to species. Following a late project start, there were few interruptions in apportionment and sonar counts. Consistent fishing and sonar operation allowed estimation of daily and total passage of most salmon and whitefish species. A general comparison was made between the 2016 sonar, Bethel test fishery, Kuskokwim River Chinook salmon mark-recapture, and weir escapement projects. Run timing tracked well between Bethel test fishery and the Kuskokwim River sonar with small discrepancies between chum to sockeye salmon ratios that may be due to the differing mesh sizes employed by each project. Chinook salmon was the only species assessed by other projects for drainagewide estimates; a comparison was made between sonar passage estimates (with annotations concerning harvest) and run size estimates from the mark-recapture project and escapement estimates from the run reconstruction model. When considering the shorter sonar sampling season, preliminary total passage estimates of Chinook salmon were within 90% CI across all projects. When including the modifications recommended by the feasibility study, sonar has the potential to accurately estimate salmon and whitefish abundance, in real time, on the Kuskokwim River for future management purposes.

Download or read book Sonar Estimation of Chum Salmon Passage in the Aniak River 2003 written by Heath D. Sandall and published by . This book was released on 2006 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Aniak River sonar project has provided daily fish passage estimates for most years since 1980. During this time, the project has undergone important changes including changing from the original Bendix sonar to dual-beam and is in the process of migrating to a high frequency imaging sonar (DIDSON). This season, the project adopted a new sampling protocol in which the sonar operated for three 4-hour blocks each day (0000-0400, 0800-1200, and 1600-2000 hours). The Aniak River sonar project was operational from 28 June through 31 July in 2003. During this period, an estimated 393,396 fish (SE 7,871) passed through the ensonified area. The peak passage of 23,208 fish occurred on 14 July and the 50% passage date occurred on 17-July. The escapement estimate was primarily comprised of age-0.3 fish (80.6%), while age -0.4 (17.9%), -0.5 (1.1%) and -0.2 (0.4%) classes were also present. Side-by-side comparisons of counts obtained with the BioSonics and DIDSON equipment suggest undercounting with the BioSonics at high densities.

Download or read book Expanding Nushagak River Chinook Salmon Escapement Indices to Inriver Abundance Estimates Using Acoustic Tags 2011 2014 written by Suzanne L. Maxwell and published by . This book was released on 2020 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: An acoustic tag study was conducted at the Nushagak River from 2011 to 2014 to determine which portions of the river Chinook salmon Oncorhynchus tshawytscha migrate through as they pass the location of a project that uses sonar to estimate salmon passage. The tagging study was done in conjunction with the sonar project, a project that uses DIDSON (dual-frequency identification sonar) and drift gillnetting techniques to estimate sockeye O. nerka, Chinook, and chum O. keta salmon passage. Chinook salmon estimates from the sonar project are an important tool for fishery managers even though an unknown proportion migrate beyond the sonar’s limited sampling range, ~30% of the river’s width. Acoustic tags were inserted into Chinook salmon captured in drift gillnets 13 km downriver from the sonar site. An acoustic receiver array deployed at the sonar site detected 94.6% of the tagged fish, and 81.9% produced usable tracks. The percentage of tagged fish that passed through 1 or both sonar beams using length-stratified groupings was 65% in 2011, 54% in 2012, 64% in 2013, and 47% in 2014, averaging 57%. Although tagged fish were observed across the entire array, dominant travel lanes emerged that differed among study years. Expanding the sonar estimates of Chinook salmon using length-stratified proportions increased the estimates by 59,251–146,409 fish per year from sonar estimates that ranged from 70,482 to 174,085 fish per year. Our recommendations are to continue the acoustic tag study for 3 years to confirm the stability of the expansion factors and improve sonar estimates by adding a midriver sampling zone or expanding past and future estimates using expansion factors from this study.

Download or read book Monitoring Atlantic Salmon Salmo Salar Populations Using Imaging Sonar Technology in the Miramichi River written by Jani Helminen and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atlantic salmon (Salmo salar) is an important species culturally and socially, and a target species of multiple fisheries globally. Primarily due to overfishing, water pollution, sedimentation, and damming, Atlantic salmon catches at sea are under a continuing decline; however, the state of different populations varies greatly, and it is important that each population is assessed accurately and independently. In this PhD research, non-invasive imaging SONAR technology was tested for collecting tributary-specific information about migrating fish in the Miramichi River, where the adult Atlantic salmon population is currently monitored using a traditional mark-recapture method. The accuracy and precision of the length measurements using long-range (up to 30m) imaging sonar data was tested and deemed low; however, a Bayesian model was created with capacity to predict the size class of adult Atlantic salmon from the sonar measurements. For efficient analysis of the sonar data, an automated data processing workflow was created. The automation counted the number of migrating fish similarly as different human-generated counts (with mean of differences between -39 % and 65 %). The tail-beat frequencies of three-fish species (Atlantic salmon, striped bass (Morone saxatilis), and American shad (Alosa sapidissima)) were calculated from the sonar data and found significantly (p

Download or read book Sonar Enumeration of Pacific Salmon Escapement Into the Nushagak River Bristol Bay Alaska 2010 2012 written by Gregory B. Buck and published by . This book was released on 2019 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydroacoustic techniques were used to develop escapement estimates of sockeye (Oncorhynchus nerka), Chinook (O. tshawytscha), and chum (O. keta) salmon for the Nushagak River in Bristol Bay, Alaska during 2010?2012. Coho (O. kisutch) and pink salmon (O. gorbuscha) salmon escapements were estimated in 2012. A standard range dual-frequency identification sonar (DIDSON) was used to estimate salmon escapement on the left (south) bank, and a long range DIDSON was used to estimate salmon escapement on the right (north) bank. Estimates of species composition, age, sex, and size composition were derived from samples obtained using drift gillnets at the sonar site. Final escapement estimates for sockeye salmon were 468,696 (2010), 428,191 (2011), and 432,438 (2012). Final escapement estimates for chum salmon were 273,914 (2010), 248,278 (2011), and 395,165 (2012). Final escapement estimates for Chinook salmon were 60,185 (2010), 108,278 (2011), and 174,085 (2012). Coho and pink salmon escapements were 329,946 and 1,214,960 in 2012. The major age class estimated for sockeye salmon was age 1.3, which ranged from 65% to 93% of the escapement in 2010-2012. The major age class for Chinook salmon was age 1.3, which ranged from 40% to 53% of the escapement in 2010-2012. The major age class for chum salmon was age 0.3, which ranged from 54% to 65% of the escapement in 2010-2012.

Download or read book 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 written by John A. Holmes and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sonar Estimation of Summer Chum and Pink Salmon in the Anvik River Alaska 2018 written by Naomi B. Brodersen and published by . This book was released on 2019 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dual-frequency identification sonar (DIDSON) was used to estimate adult summer chum salmon Oncorhynchus keta and pink salmon O. gorbuscha passage in the Anvik River from June 15 to July 26, 2018. Apportionment to species was determined using data collected from tower counts. A total of 305,098 (SE 5,926) summer chum and 1,122,346 (SE 7,588) pink salmon were estimated to have passed the sonar site. A beach seine sample fishery was conducted to collect age, sex, and length information. Both sonar systems functioned well with minimal interruptions to operation. Range of ensonification was considered adequate for most fish that migrated upstream.