Inriver Abundance and Spawner Distribution of Kenai River Sockeye Salmon Oncorhynchus Nerka, 2006-2008 PDF Download
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Author: T. Mark Willette
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 56
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Book Description
Estimates of sockeye salmon Oncorhynchus nerka escapement to the Kenai River were determined using mark-recapture methods. Radiotelemetry was used to determine the distribution of sockeye salmon spawners within the Kenai River watershed and estimate the migratory timing of major spawning stocks and the migration rates of scokeye salmon in the Kenai River in 2006-2008.
Author: T. Mark Willette
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 56
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Book Description
Estimates of sockeye salmon Oncorhynchus nerka escapement to the Kenai River were determined using mark-recapture methods. Radiotelemetry was used to determine the distribution of sockeye salmon spawners within the Kenai River watershed and estimate the migratory timing of major spawning stocks and the migration rates of scokeye salmon in the Kenai River in 2006-2008.
Author: Richard Yanusz
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 38
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Book Description
Estimates of sockeye salmon Oncorhynchus nerka escapement to the Susitna River drainage were determined via a capture-recapture experiment, which was conducted using radio tags, fish wheels, and weirs in 2008.
Author: T. Mark Willette
Publisher:
ISBN:
Category : Exploratory fishing
Languages : en
Pages : 38
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Book Description
This study investigated the temporal and spatial distributions of Kenai and Susitna river sockeye salmon (Oncorhynchus nerka) and coho salmon (O. kisutch; all stocks combined) in Upper Cook Inlet using southern offshore test fishery (OTF) catch per unit effort (CPUE) and sockeye salmon genetic data from 2006-2012 and 2014 and northern OTF CPUE and genetic data from 2012-2014. Spatial and temporal opportunities to harvest Kenai River sockeye salmon while minimizing harvests of Susitna River sockeye salmon or coho salmon were investigated using CPUE ratios for these stocks. Mean daily ratios of Kenai to Susitna river sockeye salmon CPUE's generally exceeded 10:1 after about July 20. Mean daily ratios of Kenai River sockeye salmon to coho salmon CPUE's generally exceeded 10:1 prior to July 11 along the southern transect and prior to July 18 along the northern transect. These temporal CPUE patterns indicate that in general Kenai River sockeye salmon may be harvested at a higher rate compared to Susitna River sockeye salmon after July 20, but harvest rates on coho salmon will also be higher during this period. Mean CPUE ratios of Kenai to Susitna river sockeye salmon exceeded 10:1 on the eastern end of the northern transect. Mean CPUE ratios of Kenai River sockeye salmon to coho salmon exceeded 10:1 on the eastern end of both transects with the pattern more pronounced along the northern transect. These spatial CPUE patterns indicate that in general Kenai River sockeye salmon may be harvested at a higher rate compared to Susitna River sockeye salmon and coho salmon along the eastern side of Cook Inlet, but harvest rates on Kenai River sockeye salmon would be highest near the center of the inlet. Additional years of sampling will be needed to better estimate stock-specific spatial and temporal distributions and their variability.
Author: Richard Yanusz
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 60
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Book Description
Author: Robert J. Ellis
Publisher: Forgotten Books
ISBN: 9781333895938
Category : Business & Economics
Languages : en
Pages : 70
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Book Description
Excerpt from Distribution, Abundance, and Growth of Juvenile Sockeye Salmon, Oncorhynchus Nerka, and Associated Species in the Naknek River System, 1961-64 In the summers of 1961 to 1963, juvenile sockeye salmon in the pelagic areas had a characteristic pattern of abundance. For the entire system: abundance (catch per tow) of age 0 increased from early summer to midsummer and then declined to late August. The abundance in late August varied about threefold and, in general, was independent of variations in the number of parents from 1960 to 1963. In July the abundance of age 0 fish in each basin was proportional to the amount of known contiguous spawning ground, but by late August this relation no longer existed. This change was at least partly due to migration of the age 0 fish - generally from basins of greater abundance of fish to those of lesser abun dance. The larger and faster growing fish were the first to migrate. Not all basins were involved in these migrations. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Robert J. Ellis
Publisher:
ISBN:
Category : Auke Bay (Juneau, Alaska)
Languages : en
Pages : 64
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Book Description
Author: Richard Yanusz
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 44
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Book Description
Estimates of sockeye salmon Oncorhynchus nerka escapement to the Susitna River were determined via a capture-recapture experiment, which was conducted using radio tags, fish wheels, and weirs in 2007.
Author: Kristin Courtney
Publisher:
ISBN:
Category : Fish stock assessment
Languages : en
Pages : 0
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Book Description
The 2022 forecast of Stikine River sockeye salmon, Oncorhynchus nerka, run abundance is poor and we anticipate very little harvest opportunity for either U.S. or Canadian fisheries. Since 1994, we have almost exclusively relied on the Canadian lower river commercial fishery to provide the stock-specific information that is used to complete the mixed stock run reconstruction for Stikine River sockeye salmon. It is highly likely there will be little commercial fishing opportunity in 2022 to gather this pertinent information. To obtain stock composition data necessary to estimate the inriver abundance, we will continue to conduct a sockeye salmon stock assessment program at Kakwan Point that began in 2021. The project will be conducted in conjunction with the existing Stikine River Chinook salmon, O. tshwaytscha, stock assessment program, and will extend the project through the end of the sockeye salmon run in mid-August. Tissue samples will be collected from sockeye salmon for genetic mixed stock analysis and for use in a genetic mark–recapture study to estimate inriver abundance based on an expansion of the Tahltan stock that is monitored via weir. We will also gather daily CPUE information, capture and spaghetti tag sockeye salmon, and estimate the age, sex, and length composition for sockeye salmon captured at Kakwan Point.
Author: Ronald Albert Iverson
Publisher:
ISBN:
Category : Sockeye salmon
Languages : en
Pages : 144
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Book Description
The life history of juvenile sockeye salmon (Oncorhynchus nerka) resident in Chignik River, Alaska, represents a departure from the lacustrine, pelagic existence typical of juveniles of this species. For this reason, the distribution, relative abundance in different parts of the river, growth, and upstream and downstream movements of juvenile sockeye in the river were studied during the summers of 1963 and 1964. The objectives of the study were to gain information on the possible origins of juvenile sockeye resident in Chignik River, and on the role of Chignik River in production of sockeye salmon. Distribution and abundance were estimated by seining and underwater observation. Juvenile sockeye appeared to be restricted to quiet waters along the shore. Catches of sockeye fry tended to increase through the summer, whereas catches of yearlings decreased. Smolts were taken in significant numbers only in June and July. early summer, large numbers of yearling sockeye were concentrated in Chignik River just below the outlet of Chignik Lake. In sockeye fry and yearlings captured in the lower river were generally larger than those captured in the upper river. Juvenile sockeye in the upper river grew slower than those in most other parts of the watershed. Scale analysis of sockeye salmon spawning in Chignik River showed that these fish entered the ocean at a larger size than did fish reared in Chignik Lake or Chignik River. This suggests that at least part of the progeny of river spawners do not remain in the river, but descend as fry to the brackish estuary, where growth conditions are superior. Upstream movement of schools of yearling sockeye was observed in the upper portions of the river. Such a movement has been observed many times in Chignik River in past years and has at times involved large numbers of fish. Schools of yearling sockeye have been observed to enter Chignik Lake. Fish of the same size group were captured while moving downstream at the lake outlet at night, suggesting a circular movement involving displacement of fish into the river at night and a positive rheotactic response causing them to re-enter the lake during the day. Juvenile sockeye salmon resident in Chignik River may include both progeny of river spawners, and fish which have moved down from Chignik Lake; Chignik Lake is probably the more important source. Chignik River is judged to have a minor role in the production of sockeye salmon, relative to the other rearing areas in the watershed.
Author: Alyssa Frothingham
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 55
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Book Description
In 2017, the southern offshore test fishery (OTF) conducted from July 1 through July 31 captured 2,586 sockeye salmon Oncorhynchus nerka, which represented 2,194 catch per unit of effort (CPUE) index points. The midpoint of the 2017 sockeye salmon run at the southern OTF occurred on July 20. A formal inseason estimate of the 2017 run size was made on July 24 and this analysis predicted a total run to Upper Cook Inlet (UCI) of 7.11 million sockeye salmon. Therefore, the first best-fit total run estimate from the formal inseason projection of the 2017 run was approximately 54.2% higher than the actual run size. An inseason estimate was also made for the Kenai River sockeye salmon run on July 24; the July 24 analysis predicted a total run to the Kenai River that range of 1.6-4.3 million fish. Sockeye salmon and coho salmon O. kisutch genetic samples were collected from the OTF and archived for future analysis.
