Expanding Nushagak River Chinook Salmon Escapement Indices to Inriver Abundance Estimates Using Acoustic Tags, 2011–2014 PDF Download
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Author: Suzanne L. Maxwell Publisher: ISBN: Category : Escapement (Fisheries) Languages : en Pages : 142
Book Description
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.
Author: Suzanne L. Maxwell Publisher: ISBN: Category : Escapement (Fisheries) Languages : en Pages : 142
Book Description
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.
Author: Suzanne L. Maxwell Publisher: ISBN: Category : Escapement (Fisheries) Languages : en Pages : 297
Book Description
This report is a supplement to the report: Expanding Nushagak River Chinook salmon escapement indices to inriver abundance estimates using acoustic tags, 2011–2014. Due to the length of the original report, the complete set of fish tracks from this study, current profiles, and 2 reports by Lotek, Inc. that document the evaluation of the acoustic tag system in riverine environments have been combined into this supplemental report.
Author: Jordan Head Publisher: ISBN: Category : Chinook salmon fisheries Languages : en Pages : 0
Book Description
A maximum likelihood model was developed to estimate the 1968–2020 drainagewide run size and escapement of Nushagak River Chinook salmon (Oncorhynchus tshawytscha). The model simultaneously combined information by direct observations of escapement at 8 locations (1 tower and 7 aerial surveys); harvest of fish from commercial, subsistence, and sport fisheries; inriver abundance indices from the Nushagak River sonar project; and inriver abundance estimates from acoustic tag and mark–recapture studies. Results showed that reconstructed total run size ranged from 74,000 to 629,000 Chinook salmon with an average run size of 282,000 fish, and escapement ranged from 49,000 to 476,000 fish with an average of 210,000 fish. The model estimated total run and escapement appeared to be reasonable and tracked well with previous estimates. The major deficiency of this model is the absence of overlapping, long-term escapement and run monitoring data.
Author: Brian W. Elliott Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 0
Book Description
Chilkat River large (age-1.3 and older) Chinook salmon Oncorhynchus tshawytscha inriver abundance and age and sex composition will be estimated using a 2-event mark-recapture experiment in 2019. Event 1 capture and marking will be conducted in the lower Chilkat River, and event 2 recapture will be conducted in principal spawning areas within the Chilkat River drainage. Data produced from this project will include spawning abundance of large Chinook salmon, age and sex compositions of the run, and when possible, age-1.2 abundance and length composition in the Chilkat River drainage. Chilkat River Chinook salmon are an exploitation rate and escapement indicator stock for the Pacific Salmon Commission Chinook Technical Committee, and it has been proposed that this stock be included in the coastwide Chinook salmon model used by the Pacific Salmon Commission to monitor coastwide abundance. Mark-recapture experiments have been conducted in the Chilkat River drainage since 1991; escapement estimates for 1991-2018 have an average coefficient of variation of 14%, which contributes toward precise stock assessment production estimates for the Chilkat River Chinook salmon stock. As part of the ongoing Chilkat River Chinook salmon coded wire tag studies, all Chinook salmon encountered in the mark-recapture experiment will be examined for adipose fin clips and the presence of a coded wire tag, which can be used for estimating juvenile production and marine harvest. Data collected from this project will be used to create full production estimates for the Chilkat stock.
Author: Brian W. Elliott Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 0
Book Description
Chilkat River large (age-1.3 and older) Chinook salmon Oncorhynchus tshawytscha inriver abundance and age and sex composition will be estimated using a 2-event mark–recapture experiment in 2019. Event 1 capture and marking will be conducted in the lower Chilkat River, and event 2 recapture will be conducted in principal spawning areas within the Chilkat River drainage. Data produced from this project will include spawning abundance of large Chinook salmon, age and sex compositions of the run, and when possible, age-1.2 abundance and length composition in the Chilkat River drainage. Chilkat River Chinook salmon are an exploitation rate and escapement indicator stock for the Pacific Salmon Commission Chinook Technical Committee, and it has been proposed that this stock be included in the coastwide Chinook salmon model used by the Pacific Salmon Commission to monitor coastwide abundance. Mark–recapture experiments have been conducted in the Chilkat River drainage since 1991; escapement estimates for 1991–2018 have an average coefficient of variation of 14%, which contributes toward precise stock assessment production estimates for the Chilkat River Chinook salmon stock. As part of the ongoing Chilkat River Chinook salmon coded wire tag studies, all Chinook salmon encountered in the mark–recapture experiment will be examined for adipose fin clips and the presence of a coded wire tag, which can be used for estimating juvenile production and marine harvest. Data collected from this project will be used to create full production estimates for the Chilkat stock.
Author: Philip John Joy Publisher: ISBN: Category : Chinook salmon fisheries Languages : en Pages : 56
Book Description
An age-structured state-space spawner–recruit model was fit to estimates of relative and absolute abundance, harvest, and age composition for Copper River Chinook salmon (Oncorhynchus tshawytscha) from 1980 to 2018. Bayesian statistical methods were employed to assess uncertainty in the presence of measurement error, serial correlation, and missing data. Ricker spawner–recruit parameters and management reference points were estimated, including the escapement that provides for maximum sustained yield (SMSY). An additional analysis was performed on a subset of data from 1999 to 2018 that used only mark–recapture estimates of escapement and excluded abundance indices used in the full data set. The full data set produced an SMSY of 22,844 spawners (95% credibility interval of 12,920–84,942 spawners) and the 1999–2018 data set produced an SMSY of 26,951 spawners (95% credibility interval of 15,371–98,262 spawners). Different results may be partially explained by differences in data structure and may also indicate reduced productivity in more recent years. It is important to note that many escapements observed since 1999 were greater than those observed prior to 1999 and the increased contrast in observed escapements increased information and our understanding of true underlying stock production. After examining both analyses, it is recommended that a sustainable escapement goal range of 21,000 to 31,000 fish be adopted for Copper River Chinook salmon. Escapement is evaluated by subtracting estimates of inriver harvest from estimates of inriver abundance. Escapements within this range have a high probability of producing sustainable yields.
Author: Brian W. Elliott Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 0
Book Description
Chilkat River large (age-1.3 and older) Chinook salmon Oncorhynchus tshawytscha inriver abundance and age and sex composition will be estimated using a 2-event mark–recapture experiment in 2020. Event 1 capture and marking will be conducted in the lower Chilkat River, and event 2 recapture will be conducted in principal spawning areas within the Chilkat River drainage. Data produced from this project will include spawning abundance of large Chinook salmon, age and sex compositions of the run, and when possible, age-1.2 abundance and length composition in the Chilkat River drainage. Chilkat River Chinook salmon are an exploitation rate and escapement indicator stock for the Pacific Salmon Commission Chinook Technical Committee, and it has been proposed that this stock be included in the coastwide Chinook salmon model used by the Pacific Salmon Commission to monitor coastwide abundance. Mark–recapture experiments have been conducted in the Chilkat River drainage since 1991; escapement estimates for 1991–2019 have an average coefficient of variation of 14%, which contributes toward precise stock assessment production estimates for the Chilkat River Chinook salmon stock. As part of the ongoing Chilkat River Chinook salmon coded wire tag studies, all Chinook salmon encountered in the mark–recapture experiment will be examined for adipose fin clips and the presence of a coded wire tag, which can be used for estimating juvenile production and marine harvest. Data collected from this project will be used to create full production estimates for the Chilkat stock.
Author: Nicholas James Smith Publisher: ISBN: Category : Animal radio tracking Languages : en Pages : 38
Book Description
A 2-sample mark-recapture experiment was conducted to estimate the abundance and upriver migration characteristics of adult Chinook salmon Oncorhynchus tshawytscha returning to the Kuskokwim River in 2016. Tagging occurred downriver from all known spawning tributaries, except the Eek River. A total of 621 Chinook salmon were marked with radio and spaghetti tags, of which 527 continued upriver migration and were used to estimate abundance. Radiotagged fish were tracked throughout the study area using a network of telemetry stations and a series of aerial telemetry surveys. Upriver escapement monitoring weirs served as 7 recapture locations, representing lower, middle, and upper river tributaries. A total of 21,590 Chinook salmon were evaluated for tags, and total tag recoveries was estimated at 94. Inriver abundance of Chinook salmon upstream of rkm 67 was 120,000 fish (95% CI: 99,304-147,502). Radiotagged Chinook salmon traveling to upriver tributaries were captured and tagged earlier in the run compared to tagged fish migrating to middle river tributaries. Chinook salmon returning to lower river tributaries were captured and tagged throughout the entire run. Chinook salmon swam at a median speed of 36 rkm/day (range: 31-41 rkm/day) through all portions of the mainstem Kuskokwim River upstream from Bethel.
Author: Jordan Head Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 34
Book Description
We conducted a 2-sample mark-recapture experiment using radiotelemetry methods to estimate the abundance of adult Chinook salmon in the middle and upper Kuskokwim River in 2014. Fish were captured using drift gillnets and fish wheels in the mainstem Kuskokwim River at river kilometer (rkm) 270 near the community of Kalskag. Chinook salmon were marked with radio and T-bar anchor tags. Tagged fish were tracked throughout the study area using stationary and aerial telemetry methods. Four weirs located upriver from the tag site were used to recapture tagged Chinook salmon. The abundance of Chinook salmon upriver of rkm 294 was 61,255 (95% CI: 49,021-80,985).
Author: Jeffrey L. Estensen Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 74
Book Description
This report provides a description of the chinook salmon, Oncorhynchus tshawytscha, fisheries in the Unalakleet Area; summarizes available harvest, escapement, age and sex information for returns to the Unalakleet River; and provides recommendations for improved data collection and escapement goals.
Author: Suzanne L. Maxwell
Author: Suzanne L. Maxwell
Author: Suzanne L. Maxwell
Author: Jordan Head
Author: Brian W. Elliott
Author: Brian W. Elliott
Author: Philip John Joy
Author: Brian W. Elliott
Author: Nicholas James Smith
Author: Jordan Head
Author: Jeffrey L. Estensen