ONTHESPOT - NRS HOSPITAL The pond at NRS; (above) litter dumped on the bank. Pictures by Bishwarup Dutta To battle the mosquito menace on its premises, Nil Ratan Sircar Medical College and Hospital (NRS) will use its 1.3-acre pond for pisciculture. The NRS authorities had written to the Calcutta Municipal Corporation (CMC) four months ago to take up the pond