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Book Mark recapture Experiment to Estimate the Spawning Escapement of Sockeye Salmon in the Akwe and Italio Rivers 2004

Download or read book Mark recapture Experiment to Estimate the Spawning Escapement of Sockeye Salmon in the Akwe and Italio Rivers 2004 written by Jason J. Smith and published by . This book was released on 2006 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study estimated the total spawning abundance of sockeye salmon Oncorhynchus nerka in the Akwe and Italio river systems located near Yakutat, Alaska. The abundance of sockeye salmon in 2004 was estimated using a two-event mark-recapture experiment.

Book A Mark recapture Experiment to Estimate the Spawning Escapement of Sockeye Salmon in the East Alsek River 2003

Download or read book A Mark recapture Experiment to Estimate the Spawning Escapement of Sockeye Salmon in the East Alsek River 2003 written by David L. Waltemyer and published by . This book was released on 2005 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Mark recapture Experiments to Estimate the Abundance of Sockeye Salmon in the Lost River in 2003 and 2004

Download or read book Mark recapture Experiments to Estimate the Abundance of Sockeye Salmon in the Lost River in 2003 and 2004 written by David L. Waltemyer and published by . This book was released on 2005 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Multiple Mark recapture Estimators of Salmon Spawning Run Sizes

Download or read book Multiple Mark recapture Estimators of Salmon Spawning Run Sizes written by Stephen Dennis Sykes and published by . This book was released on 1984 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Spawning Escapement of Okanogan River Blueback Salmon Oncorhynchus Nerka 1957

Download or read book Spawning Escapement of Okanogan River Blueback Salmon Oncorhynchus Nerka 1957 written by Donovan R. Craddock and published by . This book was released on 1958 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Inriver Abundance and Spawner Distribution of Kenai River Sockeye Salmon Oncorhynchus Nerka 2006 2008

Download or read book Inriver Abundance and Spawner Distribution of Kenai River Sockeye Salmon Oncorhynchus Nerka 2006 2008 written by T. Mark Willette and published by . This book was released on 2012 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Inriver Abundance and Distribution of Spawning Susitna River Sockeye Salmon Oncorhynchus Nerka 2007

Download or read book Inriver Abundance and Distribution of Spawning Susitna River Sockeye Salmon Oncorhynchus Nerka 2007 written by Richard Yanusz and published by . This book was released on 2011 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Procedures for Estimating Tag Loss Rate and Spawning Escapement in a Mark recapture Study of Metolius Kokanee Oncorhynchus Nerka

Download or read book Procedures for Estimating Tag Loss Rate and Spawning Escapement in a Mark recapture Study of Metolius Kokanee Oncorhynchus Nerka written by Peter F. Galbreath and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mark-Recapture/Resight procedures were used to estimate the 2007 spawning escapement of kokanee Oncorhynchus nerka migrating from Lake Billy Chinook into the Metolius River, Jefferson County, Oregon. An initial analysis of data, which included an adjustment for a presumed 25% tag loss rate (without confidence limits), provided an escapement estimate of 101,854 ± 11,151 (± 10.9%; 95% confidence interval). Here we present an expanded analysis of the data to look for effects of the survey protocols, and we have re-estimated abundance, incorporating the additional uncertainty associated with estimation of tag loss rate based on recapture (resight) counts of double-tagged fish. The resight procedures in this project involved subdivision of the spawning area in the Metolius into five sections, each of which was surveyed once in each of three different weeks. A two-way analysis of variance of these data indicated no significant effect on the proportion of marked fish among observed spawners (overall average = 2.42%) for either survey section or survey week. Among the 3,298 fish tagged in 2007, 491 received a second tag. A total of 59 of these double-tagged fish were resighted - 35 with both tags and 24 with a single tag. A binomial likelihood analysis of these data indicated a tag loss rate of 25.6% ± 9.9%. Incorporation of the uncertainty associated with tag loss estimation into a hypergeometric likelihood procedure to calculate escapement yielded an estimate of 106,630 ± 16,393 (± 15.4%). Several scenarios based on the 2007 data were run using these likelihood procedures, to illustrate the effects on precision of the estimate from an increase or decrease in the total number of tagged fish, in the number of double-tagged fish, and in the total number of fish observed during the surveys, as well from an increase or decrease in observed tag loss rate. The most dramatic improvement in precision of the abundance estimate per unit change in 2007 tagging/survey effort could have been obtained from increasing the proportion of double-tagged fish - to increase certainty of the tag-loss estimate. We propose adoption of the binomial-hypergeometric likelihood estimator procedures to incorporate tag loss rate and its uncertainty into a Mark-Recapture/Resight analysis for estimation of abundance, and provide suggestions for modifications of the Metolius kokanee tagging and survey procedures for spawning escapement estimation in future years.

Book A Review of Survey Life Estimates as They Apply to the Area under the curve Method for Estimating the Spawning Escapement of Pacific Salmon

Download or read book A Review of Survey Life Estimates as They Apply to the Area under the curve Method for Estimating the Spawning Escapement of Pacific Salmon written by Canada. Department of Fisheries and Oceans and published by Nanaimo, B.C. : Fisheries and Oceans, Canada. This book was released on 1990 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Review of Survey Life Estimates as They Apply to the Area under the curve Method for Estimating the Spawning Escapement of Pacific Salmon

Download or read book A Review of Survey Life Estimates as They Apply to the Area under the curve Method for Estimating the Spawning Escapement of Pacific Salmon written by C. J. Perrin and published by . This book was released on 1990 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: Escapement estimates provide a basis for setting exploitation rates and for assessing the effect of exploitation or habitat manipulation on stocks, as well as for comparing and contrasting management policies using stock-recruitment relationships. Several methods are available to estimate escapement, but for any one spawning run they can field widely different results. This report reviews estimates of `survey life' (SL) (the number of days that mature salmon are alive in a survey area) for Pacific salmon. SL is an important parameter in the area-under-the-curve (AUC) method often used to estimate the spawning escapement of Pacific salmon. The report assembles data from many sources to determine if variation in SL measurements collected for the 5 species of Pacific salmon found in B.C. can be explained by biological and environmental variables. The study determined if extrapolation of SL estimates among streams and years is valid when the AUC method is used to estimate escapement.