Author: Katherine W. MyersPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 32
Book Description
Ocean Distribution and Migration Patterns of Yukon River Chinook Salmon
Author: Katherine W. MyersPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 32
Book Description
Abundance, Distribution, and Migration Patterns of Summer Chum Salmon in the Yukon River Drainage, 2014-2015
Author: Sean LarsonPublisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 16
Book Description
Summer chum salmon (Oncorhynchus keta) in the Yukon River support robust commercial and subsistence fisheries; however, fishery managers have had incomplete information about their run timing, spawning distribution, stock composition, and abundance. To address this, a radiotelemetry study was implemented on summer chum salmon in 2014 and 2015. A total of 1,232 (2014) and 1,199 (2015) summer chum salmon were fitted with radio transmitters. Radiotagged summer chum salmon were mapped, travel rates were estimated, and proportions of tagged fish recovered within different tributaries were determined. Basic mark-recapture assumptions were tested and abundance above the tagging site was estimated. Summer chum salmon were found to be widely distributed within the Yukon River drainage. Although a few tagged fish were observed in most locations, roughly 50% of tagged fish were observed in the Anvik, Koyukuk, and Bonasila rivers each year. Summer chum salmon destined for upper river spawning areas traveled faster than those to lower river areas. Summer chum salmon tended to recover quickly after being tagged, and traveled relatively fast within the mainstem Yukon River, but slowed down after entering their spawning tributaries. The 2014 mark-recapture abundance estimate was about 2,100,000 fish, which corresponded with summer chum salmon passage at the mainstem Yukon River sonar near Pilot Station. The 2015 mark-recapture abundance estimate was also about 2,100,000 fish, which was larger than the summer chum salmon passage at the sonar near Pilot Station. Results from this study help to evaluate sonar passage estimates and provide fishery managers with more detailed information about distribution and migratory patterns of individual summer chum salmon stocks within the Yukon River drainagewide population.
Distribution and Movements of Chinook Salmon, Oncorhynchus Tshawytscha, Returning to the Yukon River Basin
Author: John Heinrich EilerPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 296
Book Description
[Cont.] Although not surprising considering the extensive variation in migration rates observed among individual fish, this finding does suggest that these pulses do not represent cohesive aggregates of fish moving upriver. Unlike the well established methods used to estimate other life history characteristics, the development of quantitative methods for analyzing and modeling fish movements has lagged noticeably behind, due in part to the complexity associated with movement data and (prior to the advent of telemetry) the difficulty of collecting this type of information on free-ranging individuals. Two fundamentally different analytical approaches, hierarchical linear regression models and multivariate ordination, were used during this study to evaluate factors thought to influence the upriver movements of the fish. In spite of the inherent differences, both methods provided strikingly similar results, indicating that the study findings were not dependent on the approach used, and suggesting that the results were plausible based on the information available and the weight of evidence. Both analytical methods had advantages, and provided complementary information. With hierarchical linear models, it was possible to simultaneously evaluate a wide range of explanatory variables (in our case, both biological and environmental), which provided standardized comparisons and simplified the interpretation of the results. Since both fixed and random effects were incorporated in the models, it was possible to account for sources of variation when insufficient information was available to identify the underlining factors - an important consideration since few field studies provide comprehensive data. With multivariate ordination, separate analyzes were needed to examine the relationships between the migration rates and the biotic and physical variables. In addition to being cumbersome, this limitation made it more difficult to compare the relative influence of the different factors and interactions between factors. However, ordination was very useful as an exploratory tool. Although compartmentalized by stock, across fish comparisons were simple and relatively straightforward. Because the explanatory variables were evaluated separately in relation to the ordination score assigned to the fish, it was possible to examine and compare highly correlated variables. Ordination was also able to identify overall patterns within the data and assess the relative importance. While this can be accomplished within the framework of linear regression using mixture models to determine whether multiple distributions exist within the data, the process is much simpler with ordination. The migratory patterns of the fish were influenced by a wide range of factors, with evidentiary support for complex, multi-faceted relationships. Physical features of the basin demonstrated stronger explanatory power, accounting for over 70% of the observed variation in migration rate compared to 18% for the biological characteristics of the fish. Parameter estimates associated with the steepness of the migratory route and remaining distance the fish had to travel to reach their natal rivers were most strongly correlated with migration rate, with consistent relationships observed across stocks. Migration rates were also noticeably slower in extensively braided reaches of the basin. The weaker relationships between migration rate and biotic factors may reflect stabilizing selection on long-distance migrants. Smaller fish exhibited minimally faster swimming speeds on average than larger individuals. This relationship was stronger in highly braided reaches. Run timing was positively related to migration rate for most stocks. Surprisingly, upper basin stocks traveling farther upriver displayed progressively negative relationships, suggesting that late-run fish were moving slower. Ancillary information suggests that this decline may relate to deteriorating fish condition later in the season.
A King Salmon Journey
Author: Debbie S. MillerPublisher: University of Alaska Press
ISBN: 9781602232303
Category : Juvenile Fiction
Languages : en
Pages : 0
Book Description
Two thousand miles is a staggering distance for any kind of journey. But imagine making it not by car or even foot—but by fin. That’s what faces Chinook, a female king salmon, as she takes a dramatic trip to safely deliver her eggs. From the Bering Sea, up the Yukon River, and on to the Nisutlin River, A King Salmon Journey takes young readers on an engaging ride through the waters of Alaska and Canada, bringing to life the biology—and mystery—of one of the world’s most popular fish. Based on the story of a real-life Chinook, this beautifully illustrated book deftly combines science with a fast-paced tale of survival and perseverance.
Distribution and Movement Patterns of Chinook Salmon Returning to the Yukon River Basin in 2000-2002
Author: Local Traditional Knowledge of the Freshwater Life Stages of Yukon River Chinook and Chum Salmon in Anvik, Huslia, Allakaket, and Fort Yukon
Author: Alida TrainorPublisher:
ISBN:
Category : Alllakaket (Alaska)
Languages : en
Pages : 74
Book Description
This report summarizes the results of research conducted in 2014 on the local traditional knowledge of Chinook and chum salmon freshwater spawning and migration patterns in four Yukon River drainage communities. Researchers worked with respondents in Anvik, Huslia, Allakaket, and Fort Yukon to map environmental changes that may have affected salmon migration and spawning. Respondents interviewed for this study shared their lifetime experiences traveling, hunting, and fishing on the land and waters around their communities and shared their personal observations of change and changes they had heard of from others in their community or in neighboring communities. The study communities were chosen because of their proximity to an existing or an historical enumeration project. Proximity to enumeration projects gave researchers the opportunity to compare local observations of fluctuating salmon presence with existing data sets. Although this study intended to document possible changes to Chinook salmon spawning and migration, an abundance of environmental and ecological changes were also recorded. Over time, and especially in recent years, respondents have observed a variety of ecological changes. Some of these changes have impeded respondents' ability to participate in subsistence harvesting activities. Although more research is needed to explore each of these observations and their possible effects on Chinook salmon, it is clear that the environment that respondents are living in is rapidly changing and affecting all aspects of the natural world that they rely upon.
Estimation of Abundance and Distribution of Chinook Salmon in the Yukon River Using Mark-recapture and Radio Telemetry in 2000 and 2001
Author: Ted R. SpencerPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 54
Book Description
The goal of this multi-year (1999-2002) cooperative study between the Alaska Department of Fish and Game and the National Marine Fisheries Service was to determine the migratory characteristics and escapement distribution of Yukon River chinook salmon. Primary objectives in 2000 and 2001 were to assess and refine fish capture and radio-tracking methods for a full-scale program in 2002, and to estimate drainage-wide population size using mark-recapture techniques.
NOAA Technical Report NMFS.
Author: The Distribution and Abundance of Chinook Salmon (Oncorhynchus Tshawytscha) in the Upper Yukon River Basin as Determined by a Radio-tagging and Spaghetti Tagging Program, 1982-1983
Author: Milligan, P. APublisher: Whitehorse : Department of Fisheries and Oceans
ISBN:
Category : Chinook salmon
Languages : en
Pages : 161
Book Description
Funded by the Yukon River Basin Committee. Objectives of the study were to quantify the number of chinook salmon returning to the Canadian portion of the Yukon River and to examine the distribution, relative abundance and migratory behaviour of specific spawning stocks.
Author: