| 6 | | EDA 2.0 (Eel Density Analysis) is a modelling tool based on a GIS river network database to predict yellow eel densities and silver escapement. The principle of this approach is (1) to relate observed yellow eel densities to different parameters: fishing method, environmental conditions (distance to the sea, relative distance, temperature, Strahler stream order, elevation and slope…), anthropogenic conditions (obstacles, fisheries…) and time (year trends), (2) to calculate the yellow eel density in each reach by applying the statistical model calibrated in step 1, (3) to calculate the yellow eel stock abundance by multiplying these densities by the surfaces of the reaches (4) to calculate a potential escapement from the catchment (mortality during downstream mortality are neglected) from the yellow eel stock estimate in step 3. |
| | 6 | ''' EDA 2.0 (Eel Density Analysis) ''' is a modelling tool based on a GIS river network database to predict yellow eel densities and silver escapement. The principle of this approach is (1) to relate observed yellow eel densities to different parameters: fishing method, environmental conditions (distance to the sea, relative distance, temperature, Strahler stream order, elevation and slope…), anthropogenic conditions (obstacles, fisheries…) and time (year trends), (2) to calculate the yellow eel density in each reach by applying the statistical model calibrated in step 1, (3) to calculate the yellow eel stock abundance by multiplying these densities by the surfaces of the reaches (4) to calculate a potential escapement from the catchment (mortality during downstream mortality are neglected) from the yellow eel stock estimate in step 3. |
