Limnology 468 Fisheries 388 England 368 Management 363 Inland waters 316 Freshwater fish 276 Rivers 274 Fishery management 231 River fisheries 220 Fishery Advisory Committee 197 Water quality 149 Migratory species 147 Licensing 127 Iran 123 Ecology 119 Fishery regulations 113 North West 92 Fish catch statistics 81 Stocking 80 Aquaculture 78 Mortality 75 Water management 72 Hatcheries 63 Pollution 59 Biology 52 Florida 51 Freshwater pollution 50 Fishery data 49 Oceanography 39 Environment 35