Download or read book Do Smolt Data Improve Adult Sockeye Salmon Forecasting Models in the Chignik Management Area written by Nyssa Baechler and published by . This book was released on 2018 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preseason forecasts of adult returns for commercially-important Pacific salmon species provide initial guidance for fishery managers to meet escapement and harvest goals and serve to help the fishing industry plan appropriately for their fishing seasons. The goal of such forecasts is to reduce uncertainty in the management and harvesting processes, yet preseason forecasts often have limited predictive performance. This study compares predictive performance and forecast error of existing models – which use sibling relationships (returning adults of the same freshwater age and brood year) to forecast returns – to models with smolt and environmental predictor variables. I selected predictor variables related to the effects of smolt abundance, size, migration timing and water temperatures on subsequent adult returns and tested these in a nested set of model runs. In general, the simpler sibling models performed better in the most recent 5-year prediction periods than the more-complex smolt models. The two most common and consistent predictor variables across smolt models were the length of the smolt outmigration season (number of days between 5% and 95% total smolt run) and the temperature of the river at the date of 95% of the total smolt outmigration. This prompted me to create a class of hybrid sibling models using sibling predictor variables and the mid-June average river temperature. Results from all model classes suggest that the standard sibling forecast model remains the simplest and best predictive model to use in the Chignik Management Area. The relatively high performance of sibling-return models probably derives from the fact that the biological information captured implicitly in sibling relationships are redundant to the types of information smolt data reflect.
Download or read book The 2013 Chignik River Sockeye Salmon Smolt Outmigration written by Adam St. Saviour and published by . This book was released on 2014 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the results of the sockeye salmon Oncorhynchus nerka smolt monitoring and enumeration project conducted by the Alaska Department of Fish and Game (ADF&G) in the Chignik River system in 2013. The research was designed to estimate smolt population size and age structure, assess fish body condition, describe limnetic habitat conditions and forage base, collect samples for genetic stock identification, and provide data for the Chignik River preseason adult sockeye salmon forecast.
Download or read book Chignik River Sockeye Salmon Smolt Outmigration written by Adam St. Saviour and published by . This book was released on 2013 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the results of the sockeye salmon Oncorhynchus nerka smolt monitoring and enumeration project conducted by the Alaska Department of Fish and Game (ADF&G) in the Chignik River system in 2012. The research was designed to estimate smolt population size and age structure, assess fish body condition, describe limnetic habitat conditions and forage base, collect samples for genetic stock identification, and provide data for the Chignik River preseason adult sockeye salmon forecast.
Download or read book The 2014 Chignik River Sockeye Salmon Smolt Outmigration written by Mary E. Loewen and published by . This book was released on 2015 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the results of the sockeye salmon Oncorhynchus nerka smolt monitoring and enumeration project conducted by the Alaska Department of Fish and Game (ADF&G) in the Chignik River system in 2014. The research was designed to estimate population size and age structure of outmigrating smolt, assess fish body condition, describe limnetic habitat conditions and forage base in rearing lakes, collect samples for genetic stock identification, and provide data for the Chignik River preseason adult sockeye salmon forecast.
Download or read book Chignik River System Sockeye Salmon Smolt Sampling Project Operational Plan 2020 2022 written by Matthew Olson and published by . This book was released on 2020 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: This operational plan describes the procedures for the sockeye salmon Oncorhynchus nerka smolt sampling project conducted by the Alaska Department of Fish and Game (ADF&G) in the Chignik River system. The project goal is to evaluate and document size and abundance trends of sockeye salmon smolt in the Chignik River system to understand rearing capacity and habitat use. The research is designed to assess age structure, fish body condition, and provide additional context for the adult sockeye salmon forecast. Age structure of the population will be estimated from scales of sockeye salmon smolt collected using a beach seine. Juvenile salmon habitat use will be examined by beach seining in near-shore marine environment. Findings from this project are vital for understanding effects of the commercial fishery and environmental changes occurring in the Chignik River system on the sockeye salmon population.
Download or read book The 2015 Chignik River Sockeye Salmon Smolt Outmigration written by Mary E. Loewen and published by . This book was released on 2016 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the results of the sockeye salmon Oncorhynchus nerka smolt monitoring and enumeration project conducted by the Alaska Department of Fish and Game in the Chignik River system in 2015. The research was designed to estimate population size and age structure of outmigrating smolt, assess fish body condition, describe limnetic habitat conditions and forage base in rearing lakes, collect samples for future genetic stock identification analysis, and provide data for the Chignik River preseason adult sockeye salmon forecast. The abundance of sockeye salmon smolt was estimated using a rotary-screw trap array and mark-recapture techniques. In 2015, a total of 9.4 million (95% CI 6.94 million to 11.87 million) sockeye salmon smolt were estimated to have outmigrated from April 17 to June 15. Of these, 133,103 (1.4%) were freshwater-age-0; 7.15 million (76.0%) were freshwater-age-1; 2.11 million (22.4%) were freshwater-age-2; and approximately 11,860 (
Download or read book The 2016 Chignik River Sockeye Salmon Smolt Outmigration written by Mary E. Loewen and published by . This book was released on 2017 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the results of the sockeye salmon Oncorhynchus nerka smolt monitoring and enumeration project conducted by the Alaska Department of Fish and Game in the Chignik River system in 2016. The research was designed to estimate population size and age structure of outmigrating smolt, assess fish body condition, collect samples for future genetic stock identification analysis, and provide data for the Chignik River preseason adult sockeye salmon forecast. The abundance of sockeye salmon smolt was estimated using a rotary-screw trap array and mark-recapture techniques. In 2016, 3.5 million sockeye salmon smolt were estimated to have outmigrated from April 21 to June 11. Of these, approximately 10,600 (0.3%) were freshwater-age-0; 1.33 million (37.5%) were freshwater-age-1; 2.19 million (62.1%) were freshwater-age-2; and approximately 1,800 (
Download or read book Sockeye Salmon Smolt Investigations on the Chignik River 2011 written by Adam St. Saviour and published by . This book was released on 2012 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the results of the sockeye salmon Oncorhynchus nerka smolt monitoring and enumeration project conducted by the Alaska Department of Fish and Game (ADF&G) in the Chignik River system in 2011. The research was designed to estimate smolt population size and age structure, assess fish body condition, describe limnetic habitat conditions and forage base, collect samples for genetic stock identification, and provide data for the Chignik River sockeye salmon forecast.
Download or read book Karluk Lake Sockeye Salmon Smolt Sampling Project 2011 to 2013 written by M. Birch Foster and published by . This book was released on 2017 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Karluk Lake is located on the southwest side of Kodiak Island and supports the largest sockeye salmon (Oncorhynchus nerka) run in the Kodiak Management Area. Sockeye salmon smolt studies have been conducted sporadically on Karluk Lake since the 1920s. This project reinstituted a Karluk Lake sockeye salmon smolt program to estimate the size and condition of outmigrating smolt; in addition, individual smolt were collected on an annual basis for stable isotope analysis. Sockeye salmon smolt outmigrating from Karluk Lake were sampled for size and condition from 2011 to 2013. Annually, a total of three strata samples (early, middle, late), with a goal of 280 fish per stratum, were collected and used to quantify the average length, weight, and condition of the outmigration. Whole fish samples were frozen for isotope analysis. Modeling experiments using body size as a parameter in a total adult run forecasting were conducted. Results demonstrated no statistically significant differences in body size estimates between strata within years; however, 2013 body size was significantly larger than 2011 and 2012 and the largest recorded in the history of the project time series. Isotope analysis yielded variable results over years but, overall, demonstrated isotopic signatures differing between systems, years, outmigration timing, and size. The forecast model performed well, albeit under a limited range of climate variability as well as fairly robust escapements, but it is potentially suitable for forecasting future salmon returns.
Download or read book Circular written by and published by . This book was released on 1969 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Possible Management Procedures for Increasing Production of Sockeye Salmon Smolts in the Naknek River System Bristol Bay Alaska written by Robert J. Ellis and published by . This book was released on 1979 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Forecasting the Abundance of Sockeye Salmon Migrations to Chignik Alaska written by Steven S. Parker and published by . This book was released on 1987 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chignik River System Sockeye Salmon Smolt Sampling Report 2021 2022 written by Matthew Olson and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the results of the sockeye salmon Oncorhynchus nerka smolt monitoring project conducted by the Alaska Department of Fish and Game in the Chignik River system in 2021 and 2022. The research was designed to assess fish body condition and document relative abundance and outmigration timing in the Chignik River watershed. Sockeye salmon smolt were captured using a beach seine in Chignik Lagoon. In 2021, 1,348 ageable scale samples were collected. Of these, 974 (72.3%) were freshwater-age-1 and 370 (27.5%) were freshwater-age-2 smolt. In 2022, 1,378 ageable scale samples were collected. Of these, 752 (54.6%) were freshwater-age-1 and 377 (27.4%) were freshwater-age-2 smolt. Sockeye smolt were of above-average body condition in 2021 and 2022 when compared to historical data.
Download or read book The 2013 Chignik River Sockeye Salmon Outmigration an Analysis of the Population and Lake Rearing Conditions written by Adam St. Saviour and published by . This book was released on 2014 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the results of the sockeye salmon Oncorhynchus nerka smolt monitoring and enumeration project conducted by the Alaska Department of Fish and Game (ADF&G) in the Chignik River system in 2013. The research was designed to estimate smolt population size and age structure, assess fish body condition, describe limnetic habitat conditions and forage base, collect samples for genetic stock identification, and provide data for the Chignik River sockeye salmon forecast.
Download or read book Chignik River System Sockeye Salmon Smolt Sampling Report 2019 2020 written by Matthew Olson and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the results of the sockeye salmon Oncorhynchus nerka smolt monitoring project conducted by the Alaska Department of Fish and Game in the Chignik River system in 2019 and 2020. The research was designed to assess fish body condition and document relative abundance and timing in the Chignik watershed. Sockeye salmon smolt were captured using a beach seine in Chignik Lagoon. In 2019, 1,175 usable samples were collected. Of these, 504 (43.0%) were freshwater-age-0; 645 (54.9%) were freshwater-age-1; and 26 (2.2%) were freshwater-age-2 smolt. In 2020, 1,663 usable samples were collected. Of these, 56 (3.4%) were freshwater-age-0; 1,569 (94.3%) were freshwater-age-1; and 38 (2.3%) were freshwater-age-2 smolt. Sockeye smolt were of above-average body condition in 2019 whereas in 2020, smolt were about average compared to historical data.
Download or read book Grant in Aid for Fisheries Program Activities written by United States. National Marine Fisheries Service and published by . This book was released on 1973 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Annual Report written by Alaska. Department of Fish and Game and published by . This book was released on 1977 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
