51 | Report on two electrofishing surveys carried out between July 10-25 1978 and July 9-12 1979 on the proposed Kielder Water
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52 | An investigation into the presence of high levels of cadmium in sea-water samples from Mounts Bay, Cornwall |
53 | Further monitoring of the impact of Crown Dale waste water treatment works final effluent on water quality |
54 | Analysis of growth and survival of sea trout from the Welsh Dee: Interim Report, 2nd April 2000 |
55 | Developing Quality Assurance for Fish Counter Data - Phase 1: An Assessment of the Salmonid Fish Counter Network in England and Wales |