Making the fish feed on the natural food organisms in the aquatic environment is the least expensive way of rearing. In Laguna de Bay, as much as 4.5 kilograms of algae accumulate in cages after two weeks. Diatoms (navicula, fragilaria, and gomphonema) predominated followed by blue-green algae and green algae.

Phytoplankton. (1986, February 5). Bulletin Today, p. 1.