Salmon: River Dee Ben Chapman To ask the Secretary of State for Environment, Food and Rural Affairs whether his Department has made a recent estimate of the size of the population of salmon in the River Dee. Huw Irranca-Davies The Environment Agency carries out an annual assessment of the number of adult salmon entering the River Dee using data from a fish trap at Chester Weir. The latest available assessment indicates a population of 5,437 adult salmon entering the River Dee in 2008.