1. Introduction

   EditorialNotes Pages: 135 - 136

2. Asking the right questions: ecotoxicology and statistics

   Guest Editorial Pages: 137 - 138

3. ED points and NOELs: how they are used by UK pesticide regulators

   • P. J. Campbell
   • S. P. Hoy

   Papers Pages: 139 - 144

4. Regulatory use of ecotoxicity statistics: a US perspective

   • Michael C. Harrass

   Papers Pages: 145 - 154

5. Aquatic toxicity tests for the control of effluent discharges in the UK — the influence of test precision

   • Paul Whitehouse
   • Mark Crane
   • Craig Turner

   Papers Pages: 155 - 168

6. Improving the quality of statistics in regulatory ecotoxicity tests

   • Peter F. Chapman
   • Mark Crane
   • Eddie McIndoe

   Papers Pages: 169 - 186

7. Time-to-event analyses of ecotoxicity data

   • Michael C. Newman
   • John T. McCloskey

   Papers Pages: 187 - 196

8. Resampling methods for ecotoxicological data

   • T. H. Sparks
   • P. Rothery

   Papers Pages: 197 - 207

9. The determination of the toxic influences to Gammarus pulex (amphipoda) caged in urban receiving waters

   • R. M. Mulliss
   • D. M. Revitt
   • R. B. E. Shutes

   Papers Pages: 209 - 215