Download or read book Age Composition Size Migration Timing and Estimation of Smolt to adult Survival of Natural origin Sockeye Salmon Oncorhynchus Nerka in the Wenatchee River WA Watershed 1997 to 2019 written by Braden Judson and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Lake Wenatchee is the dominant producer of Sockeye Salmon (Oncorhynchus nerka) within Washington State, and one of only two self-sustaining populations of Sockeye Salmon within the Columbia River watershed. The Lake Wenatchee Sockeye population is monitored by Chelan Public Utility District, and those data are used to estimate smolt-to-adult returns (SAR) for natural origin Sockeye as an index of marine survival"--Abstract.
Download or read book Temporal and Spatial Differences in Smolting Among Sockeye Salmon Oncorhynchus Nerka Populations Throughout Fresh and Seawater Migration and the Effect of Water Temperature on the Smolt Window written by Marley Carter Bassett and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Salmon smolts undergo physiological changes in the spring that are important for successful migration to seawater. Species that are widely distributed may differ in timing of physiological changes associated with smelting. In my first study, I compared indices of smolt characteristics among populations that differ in migration distance to the ocean. Fraser River sockeye salmon from four regions in the watershed were intercepted at different times during migration to characterize the parr-smolt transformation. Gill Na+/K+-ATPase (NKA) activity was highly variable at the start of migration, and was not explained by the distance from the ocean. Gill NKA activity changes with migration were also highly variable, but consistently smolts in the ocean had the highest gill NKA activities. The nature of smelting appears to be dynamic and variation was not based on the region of origin, timing during migration, or on the year of migration. The duration of time when anadromous salmon are able to survive in seawater – the smolt window – is influenced by temperature. In my second study, I found that warm water temperature abbreviated the smolt window. Additionally, isoforms of the gill NKA enzyme and endocrine signals suggest that the stimulus for smelting occurred prior emigration from the natal lake. Modeling the thermal experience that smolts encountered as they migrated downstream to the ocean in 2012 suggested Chilko fish did not experience temperatures as warm as the temperatures that abbreviated the smolt window in my study. Furthermore, climate change projections for temperature may not limit successful emigration of Chilko sockeye salmon smolts from central British Columbia to the ocean – but changes in other abiotic and biotic factors may confound this prediction."--Leaf ii.
Download or read book Age Composition Scale Circuli Measurements of Sockeye Salmon Oncorhynchus Nerka Smolts from Stamp River 1960 61 1970 Sproat Lake 1971 Sproat River 1961 1970 Somass River 1961 British Columbia and Lake Washington Washington State U S A 1967 1969 written by W. E Barraclough and published by . This book was released on 1975 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Migratory Pattern of Adult Sockeye Salmon Oncorhynchus Nerka in Bristol Bay as Related to the Distribution of Their Home river Waters written by Richard Robert Straty and published by . This book was released on 1969 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Migration of Adult Sockeye Salmon in Puget Sound and Fraser River written by Henry O'Malley and published by . This book was released on 1919 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Migration Timing of Sockeye Salmon Oncorhynchus Nerka in the Wood River Lake System Alaska written by Melinda L. Rowse and published by . This book was released on 1985 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Variation in the Early Life History of Sockeye Salmon Oncorhynchus Nerka written by Caryn A. Abrey and published by . This book was released on 2005 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Age Composition Scale Circuli Measurements of Sockeye Salmon Oncorhynchus Nerka Smolts Emigrating from Great Central Lake Via Robertson Creek British Columbia 1969 to 1974 written by W. E Barraclough and published by . This book was released on 1975 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Regional and Climate driven Factors Affecting the Migrations of Sockeye Salmon Oncorhynchus Nerka Smolts in Alaska written by Christopher R. Dailey and published by . This book was released on 2020 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The downstream migration of salmon smolts is triggered by a combination of responses to multiple environmental indicators, imposed on internal circannual rhythms, that result in variation between populations in timing. Using long-term data on daily smolt counts and associated environmental variables from multiple sources across Alaska, I tested the hypothesis that variation in migration timing between different sockeye salmon populations could be explained by differences in local environmental conditions. I first analyzed the peak, width, and interannual variation of the smolt migration period for eight populations from southwestern and southcentral Alaska. I then modeled the median emigration date and width of the emigration period as a function of stream temperature, air temperature, and precipitation to assess how each population responds to combinations of seasonal environmental cues that serve as indicators for the onset of downstream migration or conditions in the recipient environment (sea surface temperature). Lastly, I used the results of my analysis to identify spatial variation in the response of distinct salmon populations to environmental factors and identify trends in the migration timing of those populations. Through my analysis, I found that sea surface temperature and freshwater temperature are the primary environmental factors that control median smolt emigration date, while the width of the smolt emigration window is influenced primarily by freshwater temperatures and precipitation, with significant site-by-site variation.
Download or read book The Migratory Pattern of Adult Sockeye Salmon Oncorhynchus Nerka in Bristol Bay as Related to the Distribution of Their Home river Waters written by Richard R. Straty and published by . This book was released on 1969 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: The individual stocks of sockeye salmon that make up the annual spawning migration to the Bristol Bay region of Western Alaska are produced in the lakes and streams of ten major river systems, which discharge into the bay over a shoreline distance of 120 miles. The hypothesis adopted in this study was that the bay distribution of the waters from these river systems and controlling factors such as tide, wind and bottom topography determine the distribution of the individual stocks of sockeye salmon in Bristol Bay. This hypothesis was based on the premise that mature sockeye salmon return to their river system of origin to spawn and in doing so utilize recognizable characteristics of their home-river waters to guide them to its source. Hydrographic studies were carried out in upper Bristol Bay to determine the seaward course and distribution of the waters of major sockeye salmon-producing river systems draining into Bristol Bay. These studies included determination of the vertical and horizontal salinity distribution in the upper bay, tracking and plotting the distribution and course of individual river waters, which had been tagged with Rhodamine B dye, during flood and ebb tide and plotting the seaward course of plastic drift cards released at various strategic locations in upper Bristol Bay. From the results of these studies the course and distribution of the waters of each major sockeye salmon-producing river system was described for upper Bristol Bay. The distribution and migration routes of the individual stocks of Bristol Bay sockeye salmon were determined from analysis of the results of exploratory fishing operations carried out by research vessels of the United States and offshore and inshore adult sockeye salmon tagging studies conducted by the United States and Japan. The results of this analysis showed that the main migration route of all stocks of Bristol Bay sockeye is in the offshore waters of the southern half of the entrance to the bay and in the bay itself. All stocks remain in the offshore waters until within 20 to 50 miles of their home-river systems. They were, however, already beginning, to segregate according to, river of origin in the offshore waters when still as much as 150 miles from the mouths of their home-river systems. From this point to the head of Bristol Bay there was a progressive segregation of sockeye salmon stocks according to their river of origin. From these studies the general distribution and migration route of all major stocks of Bristol Bay sockeye salmon was described and illustrated on a chart of the area. Comparison of the distribution of the major river-system waters with that of their respective sockeye salmon stocks showed that the distribution of river water in outer Bristol Bay did not conform to the distribution of sockeye salmon whereas in the upper bay the individual sockeye stocks assumed a distribution which was very similar to that of their river-system waters. The conclusions reached were that the migration route, distribution and initial segregation of sockeye- stocks in the clear offshore waters of Bristol Bay are not influenced by the distribution of river water, but once in the turbid upper bay these features must somehow be related to the distribution of home-river waters and the recognizable properties they contain.
Download or read book Influences of Spawning Habitat and Geography written by Molly T. McGlauflin and published by . This book was released on 2010 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nineteen Eighty Four Migration Patterns Abundance Age Size and Sex Composition of Hobiton Lake Adult Sockeye Salmon Oncorhynchus Nerka written by Canada. Department of Fisheries and Oceans and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Migration Patterns Abundance Age Size and Sex Composition of Hobiton Lake Adult Sockeye Salmon Oncorhynchus Nerka 1984 written by K. D. Hyatt and published by . This book was released on 1985 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Smolt Size and Marine Growth Rates on Adult Sockeye Salmon Oncorhynchus Nerka Returns and Possible Implications for the Cost written by Ryall, Paul J. (Paul James) and published by National Library of Canada. This book was released on 1985 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Survival Estimates for the Passage of Spring Migrating Juvenile Salmonids Through Snake and Columbia River Dams and Reservoirs 2003 2004 Annual Report written by and published by . This book was released on 2004 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: For juvenile chinook salmon Oncorhynchus tshawytscha, sockeye salmon O. nerka, and steelhead O. mykiss that migrate through reservoirs, hydroelectric projects, and free-flowing sections of the Snake and Columbia Rivers, survival estimates are essential to develop effective strategies for recovering depressed stocks. Many management strategies were based on estimates of system survival (Raymond 1979; Sims and Ossiander 1981) derived in a river system considerably different from today's (Williams and Matthews 1995; Williams et al. 2001). Knowledge of the magnitude, locations, and causes of smolt mortality under present passage conditions, and under conditions projected for the future, are necessary to develop strategies that will optimize smolt survival during migration. From 1993 through 2002, the National Marine Fisheries Service (NMFS) and the University of Washington (UW) demonstrated the feasibility of using three statistical models to estimate survival of PIT-tagged (Prentice et al. 1990a) juvenile salmonids passing through Snake River dams and reservoirs (Iwamoto et al. 1994; Muir et al. 1995, 1996, 2001a, 2003; Smith et al. 1998, 2000a, b; Hockersmith et al. 1999; Zabel et al. 2001, 2002). Evaluation of assumptions for these models indicated that all were generally satisfied, and accurate and precise survival estimates were obtained. In 2003, NMFS and UW completed the eleventh year of the study. Flow levels during the early portion of the 2003 spring migration were similar to 2002, and only slightly higher than in the drought conditions during 2001. However, flow levels were much greater during the later part of the migration in 2003. Spill levels were similar to 2002, much higher than in 2001. Research objectives were to: (1) estimate reach survival and travel time in the Snake and Columbia Rivers throughout the yearling chinook salmon and steelhead migrations; (2) evaluate relationships between survival estimates and migration conditions; and (3) evaluate the performance of the survival-estimation models under prevailing operational and environmental conditions. Additionally, as adult return information becomes available, as part of this study we will evaluate relationships between juvenile survival and subsequent adult returns for fish with different juvenile migration histories.
Download or read book Migration and Movement Patterns of Adult Sockeye Salmon Oncorhynchus Nerka in Lake Washington written by Jennifer Newell and published by . This book was released on 2005 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Relating the Sockeye Salmon Oncorhynchus Nerka Spawning Migrating Experience with Offspring Fitness written by David A. Patterson and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adult Pacific salmon arrive at the Fraser River with a finite supply of energy to allocate between reproductive development and river migration, yet it is unknown if environmental conditions experienced by parents cause energetic trade-offs that ultimately affect offspring fitness. This thesis examined populations of Fraser River sockeye salmon (Oncorhynchus nerka) that differed in their mirgration distance (Weaver - 100 km, Gates - 363 km, and Early Stuart - 1086 km) to assess the hypothesis that migratory stress exerts an intergenerational effect on offspring fitness. When compared among three year classes of Early Stuart sockeye salmon, metrics for ovarian development at six locations along the migration route revealed no evidence of facultative adjustments of either egg number or egg size en route. In contrast, significant interannual variation existed for final ovary mass, egg size and egg number over a 16-year period, with reductions in ovary mass and egg size associated with years of high river discharge rate during the migration. Selection against maternal phenotypes with a high ovarian investment strategy was postulated as a mechanism to reconcile both data sets. Maternal and paternal gamete origin significantly influenced offspring survival. However, egg viability did not correlate with phenotypic variation in maternal energetic condition, osmoregulatory status, reproductive hormonal state, egg composition, stress, or moribund condition. Nevertheless, at the population level, migration severity may have impacted overall egg quality because (a) the two populations that experienced more severe migration conditions in 1999 and 2000 had the lowest overall embryo survival (Gates = 77%; Early Stuart = 81%; Weaver = 94%; - artifical fertilizations), and (b) a poor maternal condition (using pre-spawn mortality as surrogate of poor condition and adverse migration conditions) was positively correlated with low egg to fry survival in Early Stuart sockeye salmon over a 15 year period. Given that changes in egg size and the number of surviving offspring associated with parental influences are clear examples of intergenerational effects in sockeye salmon, the weight of evidence suggests that migratory stress associated with the parental spawning migration can contribute to an alteration in intergenerational gene flow and offspring size.
