Don Fishery Management Plan - RAFTS

Figure 3.1.1 Distribution of Atlantic Salmon4030SALMONDAFF data pre 2003Shields’ data 1996Don DSFB data 2000-2006Other data (see text)2010Includes material based on spatial digital data from the Centre for Ecology and Hydrology. Copyrigh t CEH.8 Includes material based on Ordnance Survey 1:50,000 maps with the permission of the controller of H er Majesty’s Stationery Office. Crown copyright.00310 20 30 40 50 60 70 80 90For reasons of map clarity not all Don DSFB electric fishing sites containing juvenile salmon have been illustrated as site locations changed slightly from year to year.Those that are shown include the up-and downstream limits where salmon were found on each tributary fished.3.1.2 Brown and Sea Trout Salmo truttaMigratory sea trout and non-migratory brown trout are members of the same specieswhich have adopted different life styles; brown trout remain resident in freshwaterthroughout their life whilst sea trout migrate to sea after two or more years in the river,returning to freshwater to spawn. Both are present in the Don.The distribution of trout extends to all parts of the catchment accessible to adult fish;resident trout populations have been found upstream of the obstacles mentioned abovealthough access for sea trout, like salmon, is obstructed. The detailed juvenile surveys ofShields found trout fry and/or 1+ parr at all 103 study sites spread throughout thecatchment, with the greatest densities in the tributary sites (Shields, 1996).8