Semi-natural Rearing Ponds (SNRP) have been shown in studies elsewhere to possibly increase the yield of returning adults by a factor of 3 to 5 times more than stocked out fry. The objective of the SNRP technique is to produce a fitter, tougher and better adapted smolt, whilst not placing any natural populations at risk. The historic spawning and nursery areas on the River Burn system have largely been lost due to the creation of Leighton and Roundhill reservoirs. At the time the reservoirs were built, little concern was paid to the salmon, brown trout and sea trout populations. More recently when reservoirs have been created, hatcheries have been set up to mitigate for the loss of spawning and nursery areas. The most famous of these being the Kielder Hatchery on the River Tyne. According to historic Ure and Ouse Fishery Board reports, the Burn used to be very significant in providing smolts to the River Ure system. As previously mentioned, we are adipose fin clipping all the salmon we release from the pond in order to assess the adult return rate.