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20th May 21st-May 3rd-May 8th 8th May 9th-May 9th-May A. C. Hardy Age of smolts Age.determination AGRICULTURE AND FISHERIES April 24th-May 2nd April 24th-May 6th average length B.Sc Bassindale brown trout Chironomid D.Sc Department of Scientific E. S. Russell English Channel F. M. Davis Findhorn found above Stockton frequency curves Inches Investigations J. N. Carruthers J. O. Borley large numbers larvae M.Sc Mav 21st-May 29th Menzies Michael Graham migrate early migrating in 1930 migration period miles MINISTRY OF AGRICULTURE numbers of smolts Oyster Pentelow Percentage Plaice Marking Pollution Research Board pupae R. E. Savage River Tees River Tyne Salmo salar salmon and sea Scientific and Industrial sea trout smolts season seawards second winter showing extra growth smolts examined smolts of salmon Southern North Sea Stockton Bridge stomachs Table Tees estuary Trawl Trout smolts migrating two.year.old migrants Water Movements Water Pollution Water Pollution Research winter ring