TY - Generic T1 - Conservation of freshwater fish in the British Isles: the status of fish in National Nature Reserves Y1 - 1992 A1 - Lyle, A.A. A1 - Maitland, P.S. JF - Aquatic Conservation: Marine and Freshwater Ecosystems VL - 2 ER - TY - Generic T1 - Conservation of freshwater fish in the British Isles: the current status and biology of threatened species. Aquatic Conservation Y1 - 1991 A1 - Maitland, P.S. A1 - Lyle, A.A. JF - Marine and Freshwater Ecosystems VL - 1 ER -