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limnology fisheries rajasthan fisheries environmental education udaipur environment rajasthan education environment youth & environment environmental awareness environmental conservation recycling-upcycling green technology environmental research in past environmental crusader my teacher-my pride conservation mahseer fish newsletter aquatic environ college of fisheries udaipur dr ravishankar magada dr karanveer singh dr l l sharma dr george jhon dr sd singh ddg fisheries memories tributes dr s ayyappan educational tour report my teacher-mypride environmental heritage field biology field studies wildlife research awareness environmental research wildlife protection fish