Section 7(2)(e) in The Tamil Nadu Aquaculture (Regulation) Act, 1995
(e)aquaculture unit shall not be established-(A)in the buffer zone ranging from-(i)fifty to one hundred metres width in the case of sea water based farm; and(ii)twenty to twenty-five metres width in the case of estuarine water based farms;(B)(i)within one hundred metres from the outer border of a village having a population of less than five hundred;(ii)within three hundred metres from the outer border of a village or town having a population of more than five hundred; and(iii)within two kilometers from any place of heritage.