10:15 DETERMINATION OF REFERENCE CONDITIONS AND GUIDELINES FOR THE ASSESSMENT OF BIOTIC INTEGRITY OF FISH ASSEMBLAGES: A GENERIC APPROACH WITH APPLICATION TO RIVERS IN SOUTH AFRICA.
C.J. Kleynhans. Institute for Water Quality Studies, Department of Water Affairs and Forestry, Pretoria South Africa

10:30 INDEX OF BIOTIC INTEGRITY FOR A EUROPEAN RIVER BASIN, THE MEUSE : COMPARISON OF TWO METHODS TO CHARACTERIZE REFERENCE CONDITIONS.
N. Roset¹, D. Goffaux², J. Breine³, J.J. De Leeuw⁴, T. Demol⁵, T. Oberdorff¹, C. Belpaire³, and P. Kestemont². ¹Conseil Supérieur de la Pêche, Metz, France, ²Facultés Universitaires Notre Dame de la Paix, Namur, Belgium, ³Instituut voor Bosbouw en Wildbeheer, Groenendaal, Belgium, ⁴Netherlands Institute for Fisheries Research, Ijmuiden, The Netherlands, ⁵Centre de Recherche de la Nature de la Forêt et du Bois, Gembloux, Belgium

10:45 DISTINGUISHING REFERENCE FROM GRADUALLY DISTURBED SITES: THE CASE OF FISH ASSEMBLAGES IN FRENCH RIVERS.
T. Oberdorff¹, D. Pont², B. Hugueny², J.P. Porcher³, and D. Chessel². ¹Institut d'Ecologie et de Gestion de la Biodiversité. Laboratoire d'Ichtyologie. Muséum National d'Histoire Naturelle. Paris, France, ²Laboratoire d'Ecologie des Hydrosystèmes Fluviaux. Université Lyon I. 69622 Villeurbane cedex, France, ³Conseil Supérieur de la Pêche. 35510 Cesson-Sévigné, France

11:00 QUANTIFICATION OF THE ACCEPTABLE RANGE OF BIOLOGICAL INTEGRITY IN MAINE RIVERS AND STREAMS.
S.P. Davies¹, D.L. Courtemanch¹, L. Tsomides¹, and F. Drummond². ¹Maine Department of Environmental Protection, Augusta, ME, ²University of Maine, Orono, ME

11:15 UNCERTAINTY IN ESTIMATES OF THE BIOLOGICAL CONDITION OF RIVER SITES IN THE UK BASED ON RIVPACS.
R. Clarke and J. Wright. Institute of Freshwater Ecology, River Laboratory, East Stoke, Wareham, Dorset, England.

11:30 COMPOSITIONAL SIMILARITY AS AN INTUITIVE, INTERPRETABLE, AND ECOLOGICALLY MEANINGFUL WAY OF DESCRIBING DEGREE OF BIOLOGICAL IMPAIRMENT.
C.P. Hawkins. Fisheries and Wildlife and Ecology Center, Utah State University, Logan, UT 84322-5210

11:45 THE REFERENCE CONDITION APPROACH: WHAT DO WE DO WHEN PRISTINE NO LONGER EXISTS?.
R.H. Norris. CRC for Freshwater Ecology, University of Canberra, Canberra AUSTRALIA 2601