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Abundance And Survival Rates Of Juvenile Coho Salmon Oncorhynchus Kisutch In Prairie Creek Redwood National Park
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Book Synopsis Abundance and Survival Rates of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Prairie Creek, Redwood National Park by : Kyle E. Brakensiek
Download or read book Abundance and Survival Rates of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Prairie Creek, Redwood National Park written by Kyle E. Brakensiek and published by . This book was released on 2002 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Influence of Body Size, Intra- and Inter-specific Salmonid Densities, and Habitat on Overwinter Survival of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Prairie Creek, California by : Peter Drobny
Download or read book Influence of Body Size, Intra- and Inter-specific Salmonid Densities, and Habitat on Overwinter Survival of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Prairie Creek, California written by Peter Drobny and published by . This book was released on 2016 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: I evaluated the effects of fish length, habitat attributes, and densities of Coho Salmon and trout on overwinter survival of juvenile Coho Salmon in Prairie Creek, California. Survival of PIT tagged juvenile Coho Salmon was estimated using a Cormack-Jolly-Seber Model based on mark-recapture data from seine net captures, PIT tag antenna detections, and a rotary screw trap. A zero inflated Poisson binomial model, based on a 2-pass snorkeling methodology, estimated pool-specific abundance of juvenile Coho Salmon while accounting for variable snorkeler detection efficiency as well as estimating the effect of habitat attributes on density. Trout densities were obtained using raw snorkel counts. Overwinter survival of PIT tagged juvenile Coho Salmon during 2014-2015 was estimated to be 0.35 (95% CI 0.30-0.40), similar to survival estimates for Prairie Creek in previous years. Survival increased with fish length and decreased with intraspecific density. There was no evidence that density of small (150 mm) trout, large (150 mm) trout, or habitat attributes influenced survival. Estimated density of juvenile Coho Salmon in pools averaged 0.5 fish/m2 (n= 159) and ranged from 0- 2.2 fish/m2, consistent with regional density values within the Pacific Northwest. Juvenile Coho Salmon density estimates declined with cover complexity and watershed area, and increased with pool depth. Probability of detecting a fish while snorkeling varied with habitat features and among observers; estimated probability of detection averaged 0.63 (n=318) and ranged from 0.19 to 0.96 across snorkel passes.This study not only continued valuable monitoring of juvenile Coho Salmon overwinter survival in the southern portion of their range, but also determined factors that may be contributing to survival rates. In addition, this study successfully applied a relatively new hierarchical modeling technique (N-mixture model) to estimate juvenile Coho Salmon densities using non-invasive methods.
Book Synopsis Overwinter Survival and Redistribution of Juvenile Coho Salmon, Oncorhynchus Kisutch, in Prairie Creek, California by : Tancy R. Moore
Download or read book Overwinter Survival and Redistribution of Juvenile Coho Salmon, Oncorhynchus Kisutch, in Prairie Creek, California written by Tancy R. Moore and published by . This book was released on 2014 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the summer of 2012, juvenile coho salmon (Oncorhynchus kisutch) in Prairie Creek, California and its tributaries were marked using PIT tags to monitor winter redistribution and estimate overwinter growth and survival. Since a substantial number of juvenile coho salmon in the Prairie Creek watershed may rear in freshwater for two years, a scale sample analysis was also conducted to determine what proportion of the 2012 population was exhibiting a two-year freshwater residency. The Cormack-Jolly-Seber model and Program MARK were used to examine how rearing location, size at tagging, habitat unit depth, and volume of large woody debris affected overwinter survival. I found that 98.6% of juveniles in 2012 were age 0, and apparent overwinter survival was 39.4%. On average, juveniles experienced a 0.13% increase in length per day and 0.35% increase in weight per day, with the smallest fish experiencing the highest growth rates. Fish that were larger in fall and tagged closer to the confluence of Prairie Creek had higher apparent overwinter survival, but habitat depth and quantity of large woody debris did not appear to impact survival probability. Large juveniles appeared to have low survival near the confluence of Prairie Creek; however, the model could not distinguish deaths from emigration, meaning the high mortality rate for large juveniles near the mouth may actually reflect a pattern of early emigration from the study area. Since juveniles that migrate to sea prior to spring trapping are typically treated as mortalities, these results have important implications for the way managers estimate freshwater survival for coho salmon.
Book Synopsis Survival, Growth, and Movement of Juvenile Coho Salmon (Oncorhynchus Kisutch) Over-wintering in Alcoves, Backwaters, and Main Channel Pools in Prairie Creek, California by : Ethan Bell
Download or read book Survival, Growth, and Movement of Juvenile Coho Salmon (Oncorhynchus Kisutch) Over-wintering in Alcoves, Backwaters, and Main Channel Pools in Prairie Creek, California written by Ethan Bell and published by . This book was released on 2001 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Marine Survival of Coho Salmon (Oncorhynchus Kisutch) from Small Coastal Watersheds in Northern California by : Sean M. Cochran
Download or read book Marine Survival of Coho Salmon (Oncorhynchus Kisutch) from Small Coastal Watersheds in Northern California written by Sean M. Cochran and published by . This book was released on 2015 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: California coho salmon Oncorhynchus kisutch populations are at low abundance and factors governing recruitment variability remain unclear. Changes in freshwater habitat that increase juvenile growth and size of salmon outmigrating to sea (smolts) may improve ocean survival. The best data to evaluate this among wild coho salmon populations in California come from life-cycle monitoring (LCM) stations. This study investigated whether marine survival is size-dependent (larger individuals within a cohort have higher marine survival) and whether sites and years with higher growth have higher marine survival across five LCM locations. I tested for size-dependent survival using two techniques: comparing the size of outmigrating smolts and back-calculated smolt sizes from scales of adult fish that survived to return; and using information from fish that were tagged as smolts and survived to return as adults. Analyses comparing smolt sizes back-calculated from adult scales and observed lengths from smolt traps indicated that within-year size-dependent mortality at sea occurred among many outmigrant cohorts, while analyses using smolt lengths of recaptured adult fish tagged as juveniles did not indicate any within-cohort size-selective mortality at sea. Potential explanations for the conflicting results include errors in scale back-calculation; smolts growing in habitats below smolt traps prior to ocean entrance; and fish with alternative juvenile life histories that were unaccounted for in outmigrant sampling surviving and contributing to the adult populations. In regressions across sites and years, marine survival was positively associated with early marine growth measured from the scales of surviving adult salmon and in some instances marine survival was also positively associated with mean fork length of outmigrating smolts. Although size may be an important determinant of ocean survival, this study shows that comparison of back-calculated smolts sizes from scales of adult fish and observed lengths of smolts at an upstream trapping location are unreliable approaches for testing size-selective mortality. This study also provides support for expanding studies at LCM stations to determine how juvenile coho salmon use habitat downstream of migrant trapping locations.
Book Synopsis The Influence of Habitat Characteristics on Abundance and Growth of Juvenile Coho Salmon Oncorhynchus Kisutch in Constructed Habitats in the Middle Klamath River Basin by : Michelle R. Krall
Download or read book The Influence of Habitat Characteristics on Abundance and Growth of Juvenile Coho Salmon Oncorhynchus Kisutch in Constructed Habitats in the Middle Klamath River Basin written by Michelle R. Krall and published by . This book was released on 2016 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Substantial investment has been directed toward construction of off-channel ponds in the middle Klamath River basin to benefit Coho Salmon populations. Previous research showed that abundance, retention, and growth of juvenile Coho Salmon varied across sites but were not consistently different between constructed ponds and natural habitats; instead, variation was attributed to individual site characteristics. However, the characteristics responsible for these differences are not clear. In this exploratory study, I investigated the effect of accessibility on juvenile Coho Salmon abundance within nine constructed ponds. I also assessed whether habitat conditions, Coho Salmon density, and food availability within the ponds could predict abundance, retention, and growth of Coho Salmon. Few strong relationships were found between characteristics of ponds and the response variables. Despite potentially stressful conditions at some sites, Coho Salmon occupied most ponds through the summer, suggesting that they provide suitable rearing habitats. Lack of accessibility throughout the year had potentially important effects on the survival and life history of individuals trapped in constructed ponds. Retention rates were strongly correlated with zooplankton availability, while Coho Salmon density and available benthic prey displayed little correlation with retention. While growth rate differed among ponds; while measures of prey availability did not explain variation in growth rate, growth rate was negatively correlated with Coho Salmon density in the ponds. Constructed off-channel ponds serve as important rearing habitat for Coho Salmon and an increased understanding of their role in Coho Salmon rearing and production is necessary.
Book Synopsis A Time- and State-based Approach to Estimate Winter Movement and Survival of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Freshwater Creek, California by : Nicholas Van Vleet
Download or read book A Time- and State-based Approach to Estimate Winter Movement and Survival of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Freshwater Creek, California written by Nicholas Van Vleet and published by . This book was released on 2019 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accounting for life history diversity and overwinter survival of juvenile Coho Salmon is important to inform restoration and recovery efforts for this threatened species. Multiple seaward migration patterns of Coho Salmon have been identified, including spring fry migrants, fall and winter parr migrants, and spring smolt migrants. Previous studies have indicated that spring smolt migrants have low overwinter survival rates while they are rearing in upstream habitats, suggesting that freshwater overwinter survival may be one factor that limits smolt production. However, previous research did not account for the early emigration of fall and winter parr migrants from the study area, which most likely negatively biased their overwinter survival estimates. Furthermore, previous mark-recapture methods aggregated continuous detection data into course seasonal scales in order to estimate movement and survival. In an effort to refine previous methodology, I developed a multi-state model that allowed for estimation of early emigration and survival rates in space and time by having weekly time-varying occasions paired with discrete spatial states.
Book Synopsis Effects of Logging on Growth of Juvenile Coho Salmon by : Paul M. Iwanaga
Download or read book Effects of Logging on Growth of Juvenile Coho Salmon written by Paul M. Iwanaga and published by . This book was released on 1973 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Behavior and Survival of Coho Salmon, Oncorhynchus Kisutch (Walbaum), in Sashin Creek, Southeastern Alaska by : Richard Allan Crone
Download or read book Behavior and Survival of Coho Salmon, Oncorhynchus Kisutch (Walbaum), in Sashin Creek, Southeastern Alaska written by Richard Allan Crone and published by . This book was released on 1968 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Behavior and survival in fresh water were studied for three brood years of coho salmon in Sashin Creek, Alaska, from October 1963, until September 1966. Investigations of spawning adults were conducted to determine numbers of spawners, distribution on the spawning grounds, effects on pink salmon, age composition, redd life, fecundities, and egg retention. Juvenile coho were studied to determine changes in population size, distribution in the stream, age composition of the population, food habits, and rates of mortality during fresh-water life. The number of coho spawners counted into Sashin Creek each year normally varied from 50 to 300. Weir counts and estimations of the number of spawners determined from observed spawning effort and redd life were not accurate methods of estimating the coho escapement into Sashin Creek. In 1965, a more accurate estimate was obtained by tagging a portion of the run and recording marked to unmarked ratios on the spawning grounds. I estimated that less than two percent of the viable pink salmon embryos were destroyed in 1965 by the spawning activities of coho salmon. Most coho spawners returned to Sashin Creek in 1965 and 1966 in their fourth year of life after having migrated to sea in their third year (designated 43). Smaller numbers of 32 and 54 individuals composed the remainder of the spawning population. The mean redd life of 56 females was 13 days. A small sample of coho from Sashin Creek examined for fecundity in 1966 gave a mean of 2,868 eggs per female. A weir or fyke net was fished in the spring to estimate emigration of juvenile coho. Coho smolts left Sashin Creek from April through July; peak emigration occurred in late May or early June. Coho fry left the stream in the spring and summer in widely varying numbers from year to year. I estimated from growth data, population estimates, and analysis of scale samples that most coho juveniles remained in Sashin Creek for two growing seasons before migrating to sea. Analysis of scales from juvenile coho indicated that some reabsorption of scales occurs during the winter. The possibility of reabsorption of circuli makes back-calculation of the length of younger age-groups of coho from scale measurements unreliable. Diptera were represented more often than any other order of insects in the stomachs of juvenile coho. Hemiptera were important as food items to juvenile coho in a tributary stream. The estimated survival from egg deposition to immediately prior to emergence varied between 17.5 and. 34.9 percent for the three brood years, and averaged 27. 8 percent. Early summer populations of fry were variable in size and dependent on the size of the egg deposition of the brood. Populations of fry declined rapidly during July and early August. Instantaneous mortality rates were much higher for this period than during any other time in the fresh-water life of coho salmon in Sashin Creek. Mortality dropped to a low level during the following winter period.
Book Synopsis Overwinter Survival and Movement of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Relation to Large Woody Debris and Low-velocity Habitat in Northern California Streams by : John D. Deibner-Hanson
Download or read book Overwinter Survival and Movement of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Relation to Large Woody Debris and Low-velocity Habitat in Northern California Streams written by John D. Deibner-Hanson and published by . This book was released on 2019 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Some studies suggest that Coho Salmon populations are limited by overwinter survival as a result of insufficient winter habitat. While many small-scale projects aim to define reach and basin-level habitat requirements for Coho Salmon, large-scale studies that assess multiple independent populations remain few. For my research, I quantified large woody debris (LWD) by volume and low-velocity rearing habitat (LVH) as percent area in three coastal watersheds of similar size in northern California to untangle the relationships between Coho Salmon overwinter survival, emigration timing and specific winter habitats. I used mark-recapture techniques with PIT tags to formulate Cormack-Jolly-Seber models for each of three years (2013-2015) to (1) estimate apparent overwinter survival of juvenile Coho Salmon populations, (2) determine to what extent outmigration timing varies among basins, and (3) evaluate the relationships between reach-specific survival, movement and winter habitat. LWD volume ranged from 47.8 to 109.9 cubic meters per kilometer among stream reaches while LVH area spanned from 9.3% to 23.6% of total stream area per reach. Effects of LWD on apparent overwinter survival and early emigration were absent during all three years of the study. Effects of LVH were not observed during 2013 and 2014. In 2015, LVH correlated positively with apparent overwinter survival and negatively with emigration. Larger Coho Salmon had higher apparent overwinter survival rates than small fish, whereas smaller fish had greater emigrations rates before spring. Mean apparent overwinter survival varied by basin from 0.052 to 0.567 but basins maintained consistency across years. Early emigration rates ranged even further by basin (0.023-0.773). Variation in both apparent overwinter survival and early emigration was much greater among basins than within basins. A lot remains to be learned regarding how habitat affects the migratory behavior of Coho Salmon in California and these results suggest the effects may vary significantly by stream. The drastic life history differences observed in neighboring Coho Salmon populations demonstrate the plasticity in a species once thought to be relatively inflexible. Moving forward, incorporating multi-basin approaches should be considered when evaluating freshwater survival and movement to inform large-scale restoration and conservation.
Book Synopsis Overwinter Survival and Growth of Juvenile Coho Salmon, Oncorhynchus Kisutch, in Freshwater Creek, California by : Jennifer J. Hauer
Download or read book Overwinter Survival and Growth of Juvenile Coho Salmon, Oncorhynchus Kisutch, in Freshwater Creek, California written by Jennifer J. Hauer and published by . This book was released on 2013 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effectiveness of Salmon Carcass Analogs as a Form of Nutrient Enhancement for Juvenile Coho Salmon (Oncorhynchus Kisutch) in Three Lower Columbia Watersheds by : Matthew T. Sturza
Download or read book Effectiveness of Salmon Carcass Analogs as a Form of Nutrient Enhancement for Juvenile Coho Salmon (Oncorhynchus Kisutch) in Three Lower Columbia Watersheds written by Matthew T. Sturza and published by . This book was released on 2017 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adult Pacific salmon exhibit a form of parental care after spawning and perishing by depositing a subsidy of marine derived nutrients (MDN) that may be incorporated into the stream food web and feed juvenile salmon. Adult salmon populations have significantly declined since the late 19th century, thereby reducing the amount of MDN within Pacific Northwest Streams. This loss in nutrients within stream food webs may be limiting the growth and survival of juvenile salmon and therefore reducing the population sizes of adult salmon. One strategy to mitigate for nutrient deficiencies within a stream is the use of salmon carcass analogs (SCA), pellets composed of pulverized and pasteurized marine forage fish. We investigated the effectiveness of SCA in enhancing the size and abundance of juvenile coho salmon within a complex of three watersheds (Abernathy, Germany, and Mill Creek) that empty into the lower Columbia River near Cathlamet, WA. SCA applications occurred in the fall (2010-2013) on Germany Creek and in the spring (2013-2015) on Abernathy Creek, while Mill Creek served as a reference watershed and did not receive SCA applications. We periodically gathered samples of periphyton, macroinvertebrates, and juvenile coho (fin clips) before and after SCA application at approximately two month intervals. Juvenile coho were also sampled for fork length and weight. Samples were taken at three sites at the lower, middle, and upper extent of adult coho spawning within each watershed. During the final sampling event of each year, while juvenile coho were outmigrating, fin clips were taken at smolt traps located near each river's confluence with the Columbia River. Data from smolt traps were used to estimate the average fork length and abundance of juvenile coho during each year of this project. To evaluate the timing and extent of nutrients from SCA being incorporated into the stream food web, samples were processed and analyzed for [delta] 15N, a measure of the abundance of the heavier isotope of nitrogen that occurs more abundantly in the marine environment. Seasonal trends of [delta]15N in periphyton, macroinvertebrates, and juvenile coho, as well as seasonal trends of juvenile coho fork length and weight were compared between fertilized and unfertilized watersheds. We detected SCA effects on seasonal trends of macroinvertebrate and juvenile coho [delta]15N for the fall and spring treatments, indicating SCA nutrients were incorporated by these communities. We detected SCA effects on the seasonal trends of juvenile coho fork length and weight for the spring treatment, but not for the fall treatment. We could not detect SCA effects on seasonal trends of periphyton [delta]15N for either the fall or spring treatment, potentially due to smaller than needed sample sizes. Overall the effect of fall SCA application was to disrupt the seasonal trend of [delta]15N values among trophic levels by causing an increase in [delta]15N during the late fall/early winter when values are normally decreasing. The effect of spring SCA application was to enhance the seasonal trend, causing increases in [delta]15N values greater than those seen in the absence of SCA applications. Comparing juvenile coho sizes and abundances between years with and without SCA application and between fertilized and unfertilized watersheds indicated that neither the fall or spring treatment had a significant effect on coho growth and survival. Where SCA are to be used as a salmonid recovery tool, we recommend that careful watershed selection and subsequent monitoring be employed to ensure investments are worthwhile.
Book Synopsis Abundance, Size, Habitat Utilization, and Intrastream Movement of Juvenile Coho Salmon in a Small Southeast Alaskan Stream by : Roger Dean Harding
Download or read book Abundance, Size, Habitat Utilization, and Intrastream Movement of Juvenile Coho Salmon in a Small Southeast Alaskan Stream written by Roger Dean Harding and published by . This book was released on 1993 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Winter Distribution, Movement, and Smolt Transformation of Juvenile Coho Salmon in an Oregon Coastal Stream by : Jeffrey D. Rodgers
Download or read book The Winter Distribution, Movement, and Smolt Transformation of Juvenile Coho Salmon in an Oregon Coastal Stream written by Jeffrey D. Rodgers and published by . This book was released on 1986 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: The abundance of the 1982 brood of juvenile coho salmon (Oncorhynchus kisutch) was determined in August 1983, and January and April 1984 at 20 study sites spread throughout Knowles Creek, an Oregon coastal watershed. The timing of emigration of juvenile coho from the watershed was monitored from October 1983 through June 1984. Condition factor, fork length, and gill (Na+K)-ATPase activity were measured in migrants, a captive group of Knowles Creek juvenile coho held in the laboratory, and nonmigrant fish periodically sampled from the stream. Skin guanine levels were also measured in migrant and nonmigrant groups. Juvenile coho abundance in January was significantly correlated with abundance in August. Wood volume and amount of undercut streambank were the pair of physical variables that best explained variation in the number of fish per square meter or per cubic meter in January. Two debris torrent ponds in the middle of the watershed contained large amounts of woody debris and were the most heavily used overwintering habitats for juvenile coho in the Knowles Creek. Few juvenile coho overwintered in the lower half of watershed, an area lacking woody debris. Peaks in outmigration occurred in November and May. Approximately 24% of the total number of migrants emigrated in November. Fish that reared in two of three third-order areas in summer, together with fish from the lower (fifth-order) half of the mainstem, were the first to leave the watershed. While lack of winter habitat may have been the cause of migration from the lower mainstem, low summer streamflows may have caused early migration from the low order sites. Gill (Na+K)-ATPase activity of migrants rose gradually from a low in January to a peak at the end of the study in June. Mean gill (Na+K)-ATPase activity of nonmigrants was only significantly lower than that of migrant fish during April. Gill (Na+K)-ATPase of captives was similar to that of nonmigrants until it peaked during the last two weeks in April, after which the activity fell below that of migrants or nonmigrants. Condition factor of nonmigrant fish was higher than either migrants or captives throughout the study. Migrant skin guanine levels rose sharply during the first two weeks in April and continued to rise until the end of the study in June. Approximately 8,300 juvenile coho, 44% of the estimated number of juvenile coho present in Knowles Creek in August, migrated from the watershed by the following June. An estimated 9% of the August population migrated as smolts after April 1.
Book Synopsis Endangered and Threatened Species ; Threatened Status for Southern Oregon/Northern California Coast Evolutionarily Significant Unit (ESU) of Coho Salmon by :
Download or read book Endangered and Threatened Species ; Threatened Status for Southern Oregon/Northern California Coast Evolutionarily Significant Unit (ESU) of Coho Salmon written by and published by . This book was released on 1997 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biophysical Factors Associated with the Marine Growth and Survival of Auke Creek, Alaska Coho Salmon (Oncorhynchus Kisutch) by : Joshua Benjamin Robins
Download or read book Biophysical Factors Associated with the Marine Growth and Survival of Auke Creek, Alaska Coho Salmon (Oncorhynchus Kisutch) written by Joshua Benjamin Robins and published by . This book was released on 2006 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Correlation and stepwise regression analyses were used to investigate relationships between growth in four distinct marine habitats, marine survival, and biophysical indices for Auke Creek coho salmon, a coho salmon population in Southeast Alaska. Early marine growth of males and females were positively correlated, but neither was correlated with early marine growth of jacks. Regional biophysical indices had significant effects on early marine growth of jack, but not on early marine growth of adult coho salmon. Sea surface temperature and number of hatchery pink and churn salmon juveniles released had negative and positive effects on growth in strait habitat, respectively. Hatchery pink and churn salmon abundance and pink salmon catch in Northern Southeast Alaska were negatively related to the growth of Auke Creek coho salmon in the late ocean phase. The average length-at-return of males, but not females, was negatively related to the abundance of hatchery pink and chum salmon. Female and male size-at-return were positively correlated (r = 0.68) but within-year variation was less for females, indicating possible sex-specific differences in adult size requirements associated with reproductive success. Adult survival and jack return rate were significantly related to early marine growth of adults and jacks, respectively, indicating size-selective mortality. Hatchery pink and churn salmon abundance had positive effects on adult survival and jack return rate"--Leaf iii.
Book Synopsis Survival and Movement of Juvenile Coho Salmon (Oncorhynchus Kisutch) in the Shasta River, California by : Christopher C. Adams
Download or read book Survival and Movement of Juvenile Coho Salmon (Oncorhynchus Kisutch) in the Shasta River, California written by Christopher C. Adams and published by . This book was released on 2013 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: I developed a multi-state mark-recapture model to estimate apparent survival, movement, and detection probabilities among four segments of the Shasta River during the first spring, summer, winter, and age-1 smolt outmigration periods. Apparent survival estimates in different segments of the Shasta River ranged from 0.42 to 0.74 over the summer and from 0.52 to 1.00 over the winter. The estimated apparent survival probability for age-1 smolts migrating from the upper Shasta River to the Klamath River was 0.77. Findings in this study may be used to guide restoration efforts for coho salmon in the Shasta River by focusing them on locations that are not meeting fish needs or during seasonal periods of low survival.
