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Title: River Fisheries Habitat Inventory Phase 2: Methodology Development for Juvenile Salmonids
Author: R Wyatt
Author: Environment Agency
Document Type: Monograph
Annotation: Environment Agency Project ID:EAPRJOUT_1211, Representation ID: 386, Object ID: 2428
Salmonid management requires an understanding of the relationship between juvenile abundance and habitat, and fishery management tools, such as salmon conservation limits (CLs), require the enumeration of habitat quantity and quality throughout a catchment. The objectives of this project were to refine the current Agency habitat inventory for calculating salmon CLs, and to develop a modelling framework that would integrate a number of related techniques such as CLs, the Fish Classification Scheme (FCS) and HabScore. The approach taken was to combine hydrological models of river networks based on geographical information systems (GIS) with statistical models of fish and habitat data. These models provide a quantitative inventory of the juvenile salmonid habitat and populations present within a catchment. The models to quantify habitat were calibrated on reference sites throughout England and Wales that were not considered to be affected by factors such as limited access for migratory adults, poor water quality or sedimentation problems. The models to quantify juvenile populations are based on annual electrofishing data, and interpolate and/or extrapolate these data throughout a catchment using the habitat models described above. The primary application for these models is the quantitative assessment of freshwater impacts on juvenile salmonids at a catchment scale. This report provides a summary of the work undertaken and gives some example outputs from the method. Details of the modelling methods are provided in separate papers.
Publisher: Environment Agency
Subject Keywords: HabitatsSalmonidaeFisheriesJuvenilesSalmon fisheriesPopulation dynamicsModellingFreshwater ecology
Geographic Keywords: EnglandWales
Taxonomic Keywords: Salmonidae
Extent: 60
Total file downloads: 29

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