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Greenback Mullet, Chelon subviridis (Valenciennes, 1836) is a member of the family Mugilidae occurring in the fresh, brackish and coastal marine waters of the tropical and subtropical regions. This family recognized due to its highly specialized adaptation of feeding on surface sediments associated with organic components (Odum 1970). Stomach contents analysis of animals are the corner stones for explaining the nutritional requirements and their interactions with other organisms (Windell and Bowen 1978). Research publication on feeding habit of this mullet was in Malaysia especially on Merbok is very scarce. In the present study, fish samples were collected from the upstream of Lalang and Sameling River from January to December 2011 on monthly interval. The samples were collected from artisanal fishermen who operate the barrier nets, with the dimensions of the net at 100 – 120 m long, 3 – 5 m deep, and with 2.5 cm mesh size and without bunt. Fishing operations were carried out 3-4 days before and after the full moon and new moon associated with spring tides of the month. Fishing activities were normally halted during neap tides. During the low tide nets were set by anchoring the bottom rope to the river bed. Then the head rope was raised and secured to poles during the high water. Finally, the fish was harvested during the low-water period for about 12 h after the net was set. Before transporting the fish samples to the laboratory for further analysis, they were preserved in labeled polyethylene bags with 10% formalin to prevent digestion of food materials and to stop the enzymatic activity of the stomach contents. The stomach contents were analyzed following two methods: (i) Numerical method: In numerical method, at first the number of individuals in each food category was recorded for all stomachs. Then, the total was expressed as a proportion, usually a percentage, of the total individuals in all food categories (Ikusemiju and Olaniyan 1977).

Analysis of stomach contents in green back mullet, Chelon subviridis from Merbok Estuary, Malaysia