S. No Prey items Numbers (%) Volume (%) Frequency of occurance(F) Index of Relative Importance (N+V)F = IRI
1 Crustaceans 17.3 23.5 7.87 202.24
2 Fish 15.8 15.3 7.09 124.27
3 Amphipods 5.1 3.4 3.94 18.49
4 Isopods 4.1 2.6 4.72 16.37
5 Polychaetes 3.9 1.7 3.15 9.25
6 Nematodes 4.3 2.6 5.51 18.62
7 Phytoplankton 5.2 4.3 9.45 45.83
8 Zooplankton 4.1 3.2 10.2 36.74
9 Gastropods 3.9 2.6 11 32.50
10 Bivalves 5.1 3.1 6.3 24.63
11 Sand 6.3 5.3 9.45 56.38
12 Detritus 5.8 9.5 7.87 80.56
13 Miscellaneous 12.8 17.3 6.3 121.79
14 Supplementary feeds 6.3 5.6 7.09 46.00
Table 8: The Index of Relative Importance (IRI) of the prey items of shrimp P. monodon during June-2012.