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2 V. Roche La Direction des Peches intensifia immediatement ]'inspection des activites d'elevage du bassin versant et, avec d'autres services, commenga des prelevements hebdoma- daires systematiques de 13 affluents au lac dans un but d'evaluer les apports en phos- phate. Les deux actions continuent. La Direction des Peches a aussi travaille avec une compagnie d'Etat de recolte de la tourbe pour reduire les depots de tourbe et est en relation etroite avec les autorites forestieres pour s'assurer que les arrivees de limon, de fertilisants, etc... issues des activites forestieres sont minimales. Les rejets d'usines et les fosses septiques du bassin versant sont aussi regulierement inspectes. L'objet de ce papier est d'illustrer les aspects pratiques de la gestion des peches en Irlande et ('importance prise par les decouvertes de la recherche scientifique en pratique. Mots-cles. - Salmonides - Peche - Gestion - Eau - Qualite. 1 INTRODUCTION Seven Regional Fisheries Boards are responsible for conservation, develop- ment and promotion of inland fisheries in Ireland. The Boards were estab- lished under the Fisheries Act 1980. The work of the Regional Boards is co-ordinated by the Central Fisheries Board. As well as providing a co-ordi- nating role, the Central Board pro- vides various technical services for the Regional Boards including fisher- ies research. The findings of many years of research are applied by the Boards in their work in managing and overseeing management of fisheries generally. 2 FUNCTIONS OF THE NORTH WESTERN REGIONAL FISHERIES BOARD 2.1 The main functions of the Board are: - Enforcement of the fisheries laws - Development of fisheries - Protection of water quality - Administrative functions e.g. issue of licences etc. 2.2 The Board has a permanent staff of around 30 persons and this is supplemented by employment of tem- porary staff during the summer period. Enforcement of the fisheries laws rep- resents the largest part of the Board's work, particularly prevention of illegal salmon fishing. For this purpose, the Board carries out patrols around the coast of the region and on all salmon bearing rivers and lakes. This paper concentrates on the work carried out by the Board on managment of a large salmonid lake namely Lough Conn, with particular reference to measures aimed at maintenance and improvement of water quality. 3 LOUGH CONN Lough Conn is a large limestone lake covering approximately 13,000 acres. It is part of the River Moy system and the Moy is, of course, internationally renowned as a salmon fishery. The lake is best known, however, as a wild