Fishes Fisheries 20 Identification 9 Anatomy 8 Effect of water pollution on 7 Physiology 7 Diseases 6 Environmental aspects 6 Classification 5 Congresses 5 Fishing 5 Pollution 5 Water 5 Conservation 4 Parasites 4 Aquatic animals 3 Evolution 3 Feeding and feeds 3 Fish-culture 3 Fishery management 3 Freshwater fishes 3 Marine biology 3 Research 3 Analysis 2 Behavior 2 Ecology 2 Economic aspects 2 Fish culture 2 Fish populations 2 Folklore 2