The present study was carried out the all the shrimp farm of
Muthupettai, Station-1, situated in the outlet of the pond. Station- 2,
situated in the farm discharges mixing in the back water area (junction
of Kandakruchnar and Koraiar). Station- 3, situated in the mouth of
the Muthupettai lagoon (Lat 10° 20’ 58N: Long 79° 32’ 07E), (Lat 10° 19’
47N: Long 79° 33’ 07 E), (Lat 10° 18’ 44 N; Long 79° 31’ 32E) is bounded
by a part of the Bay of Bengal and the northeast and Palk Strait on the
Southwest and which embraces as vast swamp area (Figure 1). Three
different points where selected at equidistance downstream from the
farm, where the discharge water from a shrimp farm gradually mixes
with the river water and flows into mouth of the Muthupettai lagoon.