SS4.11 Water and Society - Science and Management in a Social and Economic Context
Date: Wednesday, June 12, 2002
Time: 3:15:00 PM
Location: Carson A
 
HeaneySI, Department of Agriculture and Rural Development, Belfast, United Kingdom, ivan.heaney@dardni.gov.uk
Kennedy, G, J, Department of Agriculture and Rural Development, Bushmills, United Kingdom, gersham.kennedy@dardni.gov.uk
Crozier, W, W, Department of Agriculture and Rural Development, Bushmills, United Kingdom, walter.crozier@dardni.gov.uk
O'Connor, W, C, Department of Agriculture and Rural Development, Bushmills, United Kingdom, 
Booth, D, , Queen's University Belfast, Belfast, United Kingdom, d.booth@qub.ac.uk
 
POPULATION DYNAMICS OF SALMON AND CATCHMENT MANAGEMENT PLANNING IN NORTHERN IRELAND
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Since 1972 research on the River Bush has provided a long-term census of salmon populations within this Irish river. Along with a microtagging programme of smolts this has permitted the calculation of survival of adults at sea and also at different stages of their life history in fresh water. In recent years the study has expanded to include examination of genetic population structure, a wider range of environmental measurements and experiments for the evaluation of river habitat refurbishment measures. The central aim has been to understand mechanisms influencing stock abundance and the scales at which they may operate. A significant finding has been a marked decline in ova-smolt survival since the mid-1980s and the main factors affecting this include increased nutrient enrichment, sedimentation, altered channel flow, predation of smolts by birds and mammals and most recently climate change. The major challenge is to mitigate or reverse this decline which will require actions within the catchment and the co-operation of different stakeholders aided by local, European and international initiatives and regulations.