Aquatic biology, organisms, plankton, freshwater biology 65 Freshwater fishes 46 Fish culture in freshwater 41 Freshwater ecology 35 Dissertations, Academic (Ph.D) 18 Fishes 17 Freshwater Fisheries- Database 14 Freshwater fishes - India 14 Aquatic ecology-- Fresh water ecology-- Pond ecology-- Limnology 11 Limnology 11 Aquatic ecology-- Fresh water ecology-- Pond ecology-- Limnology (biology)-- groundwater ecology 10 Ecology 9 Fishing in freshwater 9 Biology 8 Freshwater biology 8 Life sciences 8 Fish culture in aquariums 6 Freshwater 6 Freshwater animals 6 Thesis (Ph.D)-Zoology 6 Aquaculture 5 Aquatic biology 5 Freshwater & Marine Ecology 5 Freshwater invertebrates 5 Wetland ecology 5 Aquatic ecology 4 Environmental monitoring 4 Freshwater algae 4 Freshwater plants 4 Freshwater productivity 4