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 Salmonid Fisheries eBook

Salmonid Fisheries


eBook Publisher: John Wiley & Sons
Imprint: Wiley-Blackwell

Format: ePub Encrypted (DRM)


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Salmonid Fisheries is a landmark publication, concentrating on river management, habitat restoration and rehabilitation, disseminating lessons learnt in relation to the intensively studied salmonids that are applicable to future interventions, not just for salmonid species but for other non-salmonid species, biota and ecosystems. The contents of this book are the product of the Atlantic Salmon Trust’s 40 th Anniversary Conference, held in association with the Game and Wildlife Conservation Trust.

Drawing together carefully-edited contributions from many of the world leaders in river restoration from academia, commercial management and government agencies, this important book highlights the need to view river management from the context of the catchment and to adopt an ecosystem-based approach to restoration. The book is broadly divided into two sections which discuss first, the status of current understanding concerning the relationship between lotic habitat management, the response of salmonid fisheries and the theory of river restoration, and secondly, the application of this to habitat management and river restoration.

Salmonid Fisheries is an extremely valuable work of reference for fisheries managers, ecologists, environmental scientists, fish biologists, conservation biologists and geomorphologists. Libraries in all universities and research establishments where biological and earth sciences, and fisheries management are studied or taught should have copies of this book on their shelves. Contributions from a wide range of well known experts Published in association with the Atlantic Salmon Trust Habitat management is crucial for dwindling wild salmon populations Of great importance to aquatic ecologists and fisheries managers

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Title of Technology eBook: Salmonid Fisheries
Release Date: 04-22-2010
Publisher: Wiley-Blackwell

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Parent title Salmonid Fisheries
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Salmonid Fisheries


Chapter One

Variation in Habitat Quality for Drift-Feeding Atlantic Salmon and Brown Trout in Relation to Local Water Velocity and River Discharge

John Armstrong

Summary

There is a requirement to determine the effect of water discharge on the qualities of rivers and streams for resident drift-feeding salmon and trout. Two main categories of predictive biological model have been widely considered to address this issue, both of which link to an underlying template of variation in structure of hydrology and physical topology across flows. The first approach, typified by physical habitat simulation modelling (PHabSim), ascribes values to each of the local habitat types as functions of the densities and frequency of occurrence of animals that occupy them. This approach has the advantage of being relatively easily applied but has been criticised on the basis that local fish density can be a poor indicator of patch quality and does not easily relate overall habitat quality to meaningful population parameters. The second approach ascribes values to the local habitat types in terms of the food intakes, net energy gains or fitness of animals that occupy them. This concept has found favour in being potentially more robust in structure than the PHabSim approach, but parameterisation of the models cannot be achieved by simple field observations. Here, the application of energy and fitness value models to salmon and trout is explored. Morphological differences between salmon and trout are related to patch quality in terms of energetics through linking optimal food intake models to energy budgets. Using these models, relationships are establish

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