Fertilizers for Fish Ponds for more detailed information on fertilizer use. of pond water and the pounds of fish that these waters produced (9). When inorganic fertilizers were used the entire food supply of the pond was dependent upon the production of phytoplankton but when organic fertilizers were used, they were partly utilized directly by animal organisms and the phytoplankton phase was more or less omitted. The inorganic fertilizer treatment yielded the least with 3.0±0.05 tonnes/hectare. Further experiments were conducted to determine the types of inorganic fertilizer mixtures required for most economical plankton growth (15). The net fish production was highest (5.6±0.03 tonnes/ hectare) in grass carp + organic fertilizer treatment followed by organic fertilizer (4.0±0.06 tonnes/hectare). Use of organic fertilizers, such as animal manures, is discouraged since it often pro-motes development of undesirable algae. Also fish will be in better condition, and the quality of catch by fishermen usually improves. The control ponds with no fertilizer was applied produced only 0.29±0.01 tonnes/hectare. The composition of inorganic and organic fertilizers forms the basis for selection of dose and quality of fertilizer application. Inorganic Fertilizers Use only inorganic fertilizers in sportfishing ponds. An inorganic fertilizer proved best, producing the greatest amount of plankton and fish. Although yields will be lower than those obtained with exogenous feeding, fertilizer application will reduce the quantity and expense of feeding. Inorganic fertilizers are most commonly available in granular form, but liquid formulations are more effective for fish pond fertilization because of their increased nutrient solubility. chemical/inorganic fertilizers - manufactured fertilizers containing nitrogen, phosphorous and potassium in varying proportions. Granular fertilizers can be dissolved in water prior to application to improve their effectiveness (Boyd 1990). As primary elements of the food web, algae are eaten by microscopic animals called zooplankton and insects which serve as food for bream, which in turn are eaten by bass. It is also difficult to deter-mine and control the amounts of various nutrients added in organic fertilizers. While inorganic fertilizers produce perceptible results within a short period, organic manure is extremely cheap and is of considerable significance in developing countries. Fertilizers used in ponds stimulate the growth of microscopic plants called algae or plankton. fish kills. Results from tests with various commercial GLOSSARY OF TERMS assimilate - to take in and appropriate as nourishment. Inorganic fertilizers promote the production of phytoplankton on which zooplankton production depends. 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