Download or read book Contribution to the modeling of Atlantic salmon salmo salar population dynamics at the scale of stock complexes written by Victor Bret and published by . This book was released on 2012 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Une méta-analyse de la survie en eau douce du saumon Atlantique a été développée pour améliorer la modélisation de la population à l'échelle de complexes de stocks. Des séries temporelles de données oeufs-smolts provenant de 21 rivières-ateliers de l'aire de répartition du saumon Atlantique, associées à plusieurs covariables caractérisant les cours d'eau, ont été rassemblées pour mener cette étude. La méta-analyse a été développée à travers un modèle hiérarchique Bayésien. Le modèle de Bevedon & Holt classique a été revisité par une reparamétrisation en termes de taux de mortalité densité-dépendant et densité-indépendants. Un modèle hiérarchique partiellement échangeable a été construit pour intégrer des co-variables (comme la longitude et la latitude) pour capturer une part de la variabilité inter-rivière. Cette approche offre un cadre efficace pour prédire les paramètres de la survie densité-dépendante (et l'incertitude associée) pour n'importe quelle nouvelle rivière pour laquelle sont connues la latitude, la longitude, la surface et l'âge moyen des smolts. Les sorties de cette études ont été utilisées en tant qu'information a priori de la productivité en eau douce dans un modèle de cycle de vie structuré en âge pour l'Écosse-Est. Cela fournit une estimation de la série temporelle du taux de survie en mer du saumon Atlantique pour ce complexe de stock.

Download or read book Stock Recruitment and Reference Points written by Etienne Prévost and published by Editions Quae. This book was released on 2001 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book collects the available knowledge about the ecology of Atlantic salmon and contemporary stock assessment methods supporting the specific task of establishing reference points. Bayesian approaches for incorporating uncertainty are front and centre in the book. Stock and recruitment analysis methods, transport of reference points, risk analysis and use of index measures of abundance are presented in a format which can be readily understood and applied by scientists, educators, professionals and undergraduate students.

Download or read book The Atlantic Salmon written by Eric Verspoor and published by John Wiley & Sons. This book was released on 2008-04-15 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atlantic Salmon is a cultural icon throughout its North Atlantic range; it is the focus of probably the World’s highest profile recreational fishery and is the basis for one of the World’s largest aquaculture industries. Despite this, many wild stocks of salmon are in decline and underpinning this is a dearth of information on the nature and extent of population structuring and adaptive population differentiation, and its implications for species conservation. This important new book will go a long way to rectify this situation by providing a thorough review of the genetics of Atlantic salmon. Sponsored by the European Union and the Atlantic Salmon Trust, this book comprises the work of an international team of scientists, carefully integrated and edited to provide a landmark book of vital interest to all those working with Atlantic salmon.

Download or read book Habitat Suitability Index Models written by Jon G. Stanley and published by . This book was released on 1995 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Model was developed by evaluating individual suitability indices of 17 environmental variables that have been shown to affect productivity or survival of nonmigratory freshwater life history stages of Atlantic salmon (Salmo salar L.).

Download or read book Atlantic Salmon Salmo Salar L Life History Variation written by Stewart M. McKinnell and published by . This book was released on 1998 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book In Atlantic Salmon Space Use of Potential Breeders Stabilises Population Dynamics and Shapes Sexual Selection written by Colin Bouchard and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Habitat fragmentation and reduction in the availability of suitable habitats are significant threats to ecosystems in particularly for freshwater ones. For instance, accessibility, availability, and quality of breeding sites of Atlantic salmon, \textit{Salmo salar}, can be restricting in some rivers due to human activities and dams. Such threats may affect distribution of potential breeders because after their up-river migration, salmon females distribute within available breeding sites. Spatial distribution of females determines the spatial distribution of breeder males. Dominant males try to monopolise several females, whereas subordinate males adopt a sneaky behaviour. Access to females by males depends on the spatial distribution of females and on males' displacements within a river. The spatial distribution of females generates the spatial distribution of juveniles, aggregating them at some breeding sites. The latter aggregation of juveniles may raise the density-dependent mortality with potential consequences on population dynamics. The thesis aims to assess how space use of potential breeders, namely mature individuals able to spawn or fertilise eggs, influence population dynamics and sexual selection.I combined different approaches and different temporal and spatial scales to potential effects of space use of potential breeders. Time series of stock (deposited eggs) and of recruitment (juveniles) for the salmon population of the Nivelle River were combined with measures of spatial aggregation of nests. The effects of displacements and spatial distribution of potential breeders on their participation in reproduction were tested through inferring the sexual network of the population.I found that spatial aggregation of nests improved the recruitment variability but did not affect the average recruitment. The spatial aggregation of nests resulting from female aggregation was also linked to the number of effective breeders through a U-shaped curve. Such relationships suggested mate monopolization dependent on the spatial aggregation of females. The negative effect of the spatial isolation of females on their number of mates also suggest such mate monopolization. Then, the inferred sexual network enabled me to highlight a local social structure within the population. The latter structure and social competitors impacted the reproductive success of anadromous males. The participation of mature parr was one of the factors diminishing the sexual competition faced by anadromous males. Finally, mature parr were more mobile and moved more upstream than immature parr. Spatial behaviours of mature parr were linked to their participation in reproduction, individuals exhibiting wider home ranges had a higher probability to encounter females.Altogether my results show that space use of potential breeders affect both population dynamics and sexual selection. Then, spatial aggregation of females and of their nests can be beneficial for population dynamics as shown by combining different temporal and spatial scales. Females seemed to aggregate within the best breeding sites with a better environmental stability. The spatial distribution of females affected the ability of males to monopolise several females and participation of sneaky males. The availability of suitable good breeding habitats seemed restricting in the Nivelle, potentially due to the presence of impassable upstream dams. The lack of suitable breeding sites seemed impacting the mating system of the population and the sexual selection operating in. Some management actions to improve the quality of breeding sites and their availability could be planned.

Download or read book Aspects of the Life History Biology and Population Dynamics of Atlantic Salmon Salmo Salar L in Eastern Canada written by M. F. O'Connell and published by . This book was released on 2006 with total page 47 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 Evolutionary Biology of the Atlantic Salmon written by Tomislav Vladić and published by CRC Press. This book was released on 2015-08-10 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atlantic salmon (Salmo salar, L) is an anadromous species contributing to major fishery catches and comprising a significant part of the aquaculturally produced fish for human consumption. The aim of this book is to incite the interest in the field of knowledge gathered from a broad scope of disciplines that have investigated this fish species. Und

Download or read book Atlantic Salmon Ecology written by Øystein Aas and published by John Wiley & Sons. This book was released on 2010-10-18 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Atlantic salmon is one of the most prized and exploited species worldwide, being at the centre of a massive sports fishing industry and increasingly as the major farmed species in many countries worldwide. Atlantic Salmon Ecology is a landmark publication, both scientifically important and visually attractive. Comprehensively covering all major aspects of the relationship of the Atlantic salmon with its environment, chapters include details of migration and dispersal, reproduction, habitat requirements, feeding, growth rates, competition, predation, parasitsm, population dynamics, effects of landscape use, hydro power development, climate change, and exploitation. The book closes with a summary and look at possible future research directions. Backed by the Norwegian Research Council and with editors and contributors widely known and respected, Atlantic Salmon Ecology is an essential purchase for all those working with this species, including fisheries scientists and managers, fish biologists, ecologists, physiologists, environmental biologists and aquatic scientists, fish and wildlife department personnel and regulatory bodies. Libraries in all universities and research establishments where these subjects are studied and taught should have copies of this important publication. Comprehensive and up-to-date coverage of Atlantic Salmon Atlantic Salmon is one of the world's most commercially important species Backed by the Norwegian Research Council Experienced editor and internationally respected contributors

Download or read book Ecology of Atlantic Salmon and Brown Trout written by Bror Jonsson and published by Springer Science & Business Media. This book was released on 2011-05-03 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: Destruction of habitat is the major cause for loss of biodiversity including variation in life history and habitat ecology. Each species and population adapts to its environment, adaptations visible in morphology, ecology, behaviour, physiology and genetics. Here, the authors present the population ecology of Atlantic salmon and brown trout and how it is influenced by the environment in terms of growth, migration, spawning and recruitment. Salmonids appeared as freshwater fish some 50 million years ago. Atlantic salmon and brown trout evolved in the Atlantic basin, Atlantic salmon in North America and Europe, brown trout in Europe, Northern Africa and Western Asia. The species live in small streams as well as large rivers, lakes, estuaries, coastal seas and oceans, with brown trout better adapted to small streams and less well adapted to feeding in the ocean than Atlantic salmon. Smolt and adult sizes and longevity are constrained by habitat conditions of populations spawning in small streams. Feeding, wintering and spawning opportunities influence migratory versus resident lifestyles, while the growth rate influences egg size and number, age at maturity, reproductive success and longevity. Further, early experiences influence later performance. For instance, juvenile behaviour influences adult homing, competition for spawning habitat, partner finding and predator avoidance. The abundance of wild Atlantic salmon populations has declined in recent years; climate change and escaped farmed salmon are major threats. The climate influences through changes in temperature and flow, while escaped farmed salmon do so through ecological competition, interbreeding and the spreading of contagious diseases. The authors pinpoint essential problems and offer suggestions as to how they can be reduced. In this context, population enhancement, habitat restoration and management are also discussed. The text closes with a presentation of what the authors view as major scientific challenges in ecological research on these species.

Download or read book Modeling Uncertainty in Fish Population Dynamics written by Yan Jiao and published by . This book was released on 2004 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Ice Conditions on Behaviour and Population Dynamics of Atlantic Salmon Salmo Salar L Parr written by Tommi P. Linnansaari and published by . This book was released on 2009 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Atlantic Salmon in Maine written by National Research Council and published by National Academies Press. This book was released on 2004-09-07 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because of the pervasive and substantial decline of Atlantic salmon populations in Maine over the past 150 years, and because they are close to extinction, a comprehensive statewide action should be taken now to ensure their survival. The populations of Atlantic salmon have declined drastically, from an estimated half million adult salmon returning to U.S. rivers each year in the early 1800s to perhaps as few as 1,000 in 2001. The report recommends implementing a formalized decision-making approach to establish priorities, evaluate options and coordinate plans for conserving and restoring the salmon.

Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 2013 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Atlantic Salmon Brood Stock Management and Breeding Handbook written by Harold L. Kincaid and published by . This book was released on 1989 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Best Practices for Constructing Size structured Population Dynamics Models Used for Stock Assessments written by Lee Cronin-Fine and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: All models are predicated on assumptions which makes them simplified versions of reality. An important goal of stock assessment scientists is to expand the capability of stock assessment models to improve their ability to estimate the size of fished populations and how they will change over time. Several types of population dynamics models can be used for stock assessment, with age-structured models, which track the population by age, being the most popular. Unfortunately, there are valuable fished species such as crabs and lobsters that are difficult to age. Size-structured models that track the population by size are good alternatives. The objective of this dissertation is to improve the performance of size-structured models used for stock assessments. Three aspects of size-structured models are explored: growth, selectivity, and natural mortality. Size-transition matrices define growth in size-structured models. They are constructed from an underlying growth curve, typically the von Bertalanfy growth curve, defined by three parameters: the growth rate (k), the asymptotic height (L[infinity]), and the variation in the size increment. Most assessments assume individuals follow a single growth curve with process error, which is unrealistic. A new size-transition matrix construction method that allows L∞ and k to vary among individuals through numerical integration was developed and compared with methods that allow individuals to follow (a) a single growth curve with process error, or (b) one of three growth curves, each with process error. The number of size-classes in the size-transition matrix and how the data are generated heavily dictate performance. Not accounting for temporal variation in selectivity can lead to biased estimates of abundance and mortality. Simulations suggest that discrete time blocking of selectivity can adequately capture time-varying selectivity as this could reduce the number of estimated parameters and hence the variance of estimated quantities. As for likelihood functions for size-composition data, the results reveal that multinomial, Dirichlet-multinomial and multivariate normal are all valid options. Natural mortality (M) has a strong influence on stock assessment model outputs including estimates of spawning stock biomass, MSY and fishing mortality. Estimating M is difficult since it is confounded with several factors including catchability, recruitment, and growth. Simulation shows that terminal molt does not affect the ability to estimate M. However, estimating growth simultaneously with M has a negative impact on the ability to estimate M but a positive effect on the quality of the estimates for spawning stock biomass.