Lowering Pond Water Temperature With Water Lettuce
Agriculture|April 2017

ONE OF THE NEGATIVE IMPACTS of climate change on aquaculture in our country is the high temperature of water in fishponds, especially during the dry season months of April to May. In freshwater ponds that are shallow (less than 1 meter) and without any supplemental water supply from irrigation or pumps, “fish kills” can occur when the water temperature exceeds 32 degrees Celsius.

Dr. Rafael D. Guerrero Iii
Lowering Pond Water Temperature With Water Lettuce

In an experiment done at the fish farm of Aquatic Biosystems in Bay, Laguna from April to May 2016, the water lettuce (Pistia stratiotes), locally known as “kuyapo,” was used as a shade plant for reducing the water temperature of freshwater ponds and was found to be effective for fish growth during the hot months. The “kiyapo” is a floating aquatic plant that is a common weed in lakes, rivers, and rice paddies throughout the country.

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