Bacteria are abundant and form floccule by agglutination in fertile fish ponds, most of ¹⁴C was used to investigate the digestion and absorption rate of bacteria floccules Results obtained were 45.1% and 81.4% by Hypophthalmichthys molitrix and Oreochromis niloticus respectively. Beef extractpeptone, leaf extract of Eichhornia sp. and organic residue of pond as organic source were used to culture bacteria. The floccules thus analysed contained 50.1%, 36.5% and 36.7% crude protein respectively and all necessary amino acids for fish larva growth. Floccules were employed to feed fish larva successfully. After 13 days of feeding, the wight of H. molitrix (338. lmg) and O. niloticus (252.7mg) increased by 67.3%and 104.1% respectively. The above results show the satisfactory effects of fluccole as fish feed and confirm its role as an important producer in pond ecosystem. They also suggest that apart from the generally conception of phytoplankton-zooplankton-fish food chain, there may be other processes of organic mass flow beginning from bacterium such as bacterium-protozoan-fish, bacterium-zooplankton-fish and bacterium-fish in pond ecosystem, which are ignored at present