S. No Prey items Numbers (%) Volume (%) Frequency of occurance (F) Index of Relative Importance (N+V)F = IRI
1 Crustaceans 18.3 21.3 5.71 139.923
2 Fish 15.3 13.7 7.14 113.118
3 Amphipods 5.2 6.2 4.76 34.712
4 Isopods 6.5 2.5 10 31.50
5 Polychaetes 5.9 3.8 11.9 51.12
6 Nematodes 3.1 3.6 4.76 20.236
7 Phytoplankton 3.6 6.7 7.14 51.438
8 Zooplankton 5.1 4.5 6.19 32.955
9 Gastropods 3.9 3.8 5.24 23.812
10 Bivalves 4.3 1.9 7.14 17.866
11 Sand 5.8 6.5 6.19 46.035
12 Detritus 6.2 7.5 9.05 74.075
13 Miscellaneous 10.3 12.8 6.67 95.676
14 Supplementary feeds 6.5 5.2 8.1 48.62
Table 5: The Index of Relative Importance (IRI) of the prey items of shrimp P. monodon during March-2012.
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