Aquatic ecology-- Fresh water ecology-- Pond ecology-- Limnology 66 Aquatic ecology-- Fresh water ecology-- Pond ecology-- Limnology (biology)-- groundwater ecology 49 Aquatic ecology-- Fresh water ecology-- Pond ecology-- Limnology (biology)-- groundwater ecology-- Periph 32 Aquatic biology, organisms, plankton, freshwater biology 15 Ecology 6 Fresh water 6 Freshwater ecology 6 Freshwater fishes 6 Fish culture 5 Fish culture in freshwater 5 Fishes 5 Pisces 5 Vertebrates-- Cold-blooded vertebrates-- Pisces (Fishes)-- Cat fishes 5 Zoology 5 Fresh water ecology 4 Freshwater fishes - India 4 MPhil Dissertations 4 Aquaculture 3 Dissertations, Academic (Ph.D) 3 Environment 3 Fishes-India 3 Fresh water fisheries - India 3 Freshwater biology 3 Limnology 3 fresh water ecology 3 Animal ecology-- Animals of specific environments 2 Aquatic environment 2 Bryozoa 2 Climatic changes 2 Economics 2