Download or read book Mortality and Development of Wild Atlantic Salmon Salmo Salar Embryos Associated with Environmental Conditions Over Winter in the Miramichi River Basin written by Jacqueline Michelle Lavery and published by . This book was released on 2017 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic winter conditions in northern streams present considerable challenges for incubating wild Atlantic salmon (Salmo salar) embryos. How these winter conditions affect embryo mortality and development in nature is poorly understood. The goals of the present study were to 1) identify abiotic variables associated with the mortality of wild salmon embryos and 2) assess the accuracy and precision of embryonic developmental prediction methods currently used for conservation and basic research purposes. Over two study years (2013-2014 and 2014-2015), embryos were reared in artificial redds in five active spawning reaches in the Miramichi River basin and mortality was quantified at two sampling events (late March, pre-freshet and late May, post-freshet). Through partial least squares regression analyses, 37.6% of the total variation in embryo mortality was explained by abiotic predictor variables from five continuous measurements of incubation conditions in each reach (water temperature, water level, dissolved oxygen, ice conditions, and substrate characteristics). Each of the five groups of predictor variables contributed uniformly to the explained variation, which suggests that mortality is influenced by multiple interacting abiotic conditions, rather than a single variable. Developmental states based on external morphology were assigned to live embryos and alevins at various points through the incubation periods. Corresponding temperature records were used to calculate predicted developmental progression using three temperature-based relative age methods (cumulative degree-days, effective degree-days, and tau somites). Embryonic development was not observed to match any of the prediction methods. However, a linear model fitting effective degree-days to assigned developmental state was suggested as a first step to improve predictions. Population-specific adjustments to parameters within the effective degree-day or tau somite methods and the inclusion of other abiotic variables are recommended. Results from the present study support a multi-faceted ecological perspective of embryonic mortality and development in nature and may provide a baseline from which to measure the impacts of further environmental change.

Download or read book Advances in the Ecology of Stream Dwelling Salmonids written by Javier Lobon-Cervia and published by Springer Nature. This book was released on with total page 733 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Age Growth and Mortality of Juvenile Atlantic Salmon in Streams written by Patrick W. Bley and published by . This book was released on 1987 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Smolt Production and Overwinter Mortality of Atlantic Salmon Salmo Salar Stocked as Fry written by Kevin G. Whalen and published by . This book was released on 1998 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Early Life Stage Mortality of Atlantic Salmon Salmo Salar written by Jeffrey Paul Fisher and published by . This book was released on 1995 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Migration Route and Timing of Miramichi River Salmon salmo Salar as Indicated from Recaptures of Tagged Smolts and Adults written by Canada. Fisheries and Marine Service. Maritimes Region. Resource Development Branch and published by halifax : fisheries and marine service. This book was released on 1975 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Production of Juvenile Atlantic Salmon Salmo Salar in Natural Waters written by National Research Council Canada and published by NRC Research Press. This book was released on 1993 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Up-to-date information, knowledge and research in progress in scientific fields related to natural production of juvenile Atlantic salmon and some other ecologically similar fluvial salmonids is contained in the 25 papers and 12 abstracts contained in this publication, which were prepared for an international symposium held in St. John's, Newfoundland. Studies relate to stream ecology, invertebrates and predators, habitat improvement, competitive effects, behaviour and dispersal, habitat and production of juvenile salmon, population dynamics and relationships of juvenile salmon estimates to smolt yields. A list of participants at the conference is also provided.

Download or read book Age Growth and Mortality of Juvenile Atlantic Salmon in Streams written by Patrick W. Bley and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Atlantic Salmon Restoration to New England Waters written by and published by . This book was released on 1989 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Freshwater Migration and Behaviour of Wild Adult Atlantic Salmon Salmo Salar in the Miramichi River New Brunswick Canada written by Ryan M. Carrow and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Historically, the Miramichi River, New Brunswick, Canada, had the largest population of Atlantic Salmon (Salmo salar) in North America but has now failed to consistently meet conservation targets set by Fisheries and Oceans Canada for over two decades. Miramichi River salmon return as mature adults to their natal river in either an early (June/early July) or late (September/October) run group, where they enter the river and migrate upstream to spawning areas. The specific, in-river migratory behaviour of the two temporally distinct runs and the habitats utilized during migration are poorly understood in the Miramichi River. In this thesis, radio telemetry was used to monitor adult migration behaviour and habitat selection for early and late run salmon in the Miramichi River. On average, early run salmon migrated 1.5 river km per day (rkm/d), and selected deep habitat (>0.5 m) with large substrate sizes. Salmon started to use thermal refugia when river temperatures reached 19 °C, and increasingly at temperatures > 22 °C. In autumn, river conditions appeared to delay late run salmon from entering freshwater for weeks. Late run salmon migrated between 1.0 – 2.4 rkm/d on average, selected deep habitat types (>0.5 m) with cobble substrate, spawned between mid-October to late November, and began migrating downstream after spawning. Fisheries managers can use this information for better conservation, restoration and rehabilitation of Miramichi Atlantic Salmon population and their critical habitat.

Download or read book Factors Affecting Overwinter Mortality and Early Marine Growth in the First Ocean Year of Juvenile Chinook Salmon in Quatsino Sound British Columbia written by Katherine Rose Middleton and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Evidence suggests that the variability in recruitment of adult Pacific salmon is related to smolt survival during the first ocean year. Specifically, the first few weeks and first marine winter may be two critical periods of high mortality during early marine life. Mortality during early marine residency has been attributed to predation and size-dependent factors while high mortality during the first winter may be due to energy deficits and failure to reach a certain size by the end of the growing season. My study assessed factors influencing overwinter mortality and early marine growth in juvenile Chinook salmon (Oncorhynchus tshawytscha) from Marble River, Quatsino Sound, British Columbia. Juvenile salmon were collected during November 2005 and 2006 (fall) and March 2006 and 2007(winter). Mortality rates over the first winter derived from catch per unit effort across seasons ranged between 80-90% in all years. These are the first estimations of overwinter mortality in juvenile Pacific salmon. Fish size distributions showed no evidence of size-selective overwinter mortality between fall and winter fish in either 2005-2006 or 2006-2007. Otolith microstructure analyses showed no significant difference in circulus increment widths during the first four weeks after marine entry. Similarities in increment width indicated that early marine growth did not differ between fall and winter fish during early marine residency in 2006. These observations show that the high overwinter mortality rates of juvenile Chinook salmon in Quatsino Sound are not size-dependent. Total plankton biomass was significantly lower in the winter season but size distribution, gut fullness and energy density data did not show evidence of starvation. No correlation was found between early marine growth, size, energy accumulation and high mortality in Marble River juvenile Chinook salmon during their first ocean winter in Quatsino Sound. Possible factors influencing these high mortality rates may include non size-selective predation, disease, local environmental influences or an as yet unknown source. Future work should continue to focus on understanding the relationship between early marine survival and adult recruitment. The expansion of growth comparisons geographically and chronologically while determining the effects of predatory mortality on juvenile Chinook salmon along the north Pacific continental shelf and beyond are imperative to fully understanding this complex marine life stage.

Download or read book Mortality of Juvenile Atlantic Salmon Salmo Salar Exposed to Water Withdrawn from the Hypolimnion of a Headpond on the Mersey River Nova Scotia written by Gilbert J. Farmer and published by . This book was released on 1989 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic Analysis of Development Mortality in Oiled and Unoiled Lines of Pink Salmon written by William W. Smoker and published by . This book was released on 1998 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Offspring of oil-exposed salmon show reduced reproductive fitness. Eggs cultured in replicate laboratory incubators from factorial matings of adult offspring of pink salmon exposed to Exxon Valdez crude oil were 60% less likely to complete early embryonic development than eggs cultured from salmon in a control line. This fitness loss occurred despite the success of the offspring of oil-exposed salmon in completing their anadromous life cycle in the North Pacific Ocean. Further loss of reproductive fitness was evident in that embryonic development of the remaining viable eggs of the oil-exposed line was disrupted; hatching was significantly advanced (four days) compared to embryos derived from the control line. Total phenotype variation both of embryo mortality and of embryo development time in offspring of oil-exposed salmon was nearly double total phenotype variation in offspring of the control line." -- leaf 2.

Download or read book Atlantic Salmon Salmo Salar Parasites as Biological Tags in the Miramichi River System New Brunswick written by Gerard Murdock Hare and published by . This book was released on 1974 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Diel Thermal Cycles on Growth and Performance of Wild Atlantic Salmon Salmo Salar written by Stephanie McKenna and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Marine Mortality of Atlantic Salmon Salmo Salar L Methods and Measures written by E. C. E. Potter and published by . This book was released on 2003 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Temperature induced Deformities in Atlantic Salmon Salmo Salar Embryos written by Harald Takle and published by . This book was released on 2005 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: