Waterworks Chemist of the Water Supplies Department, Mr TANG Ho-wai, says that to ensure an ecological balance and to maintain good water quality, the department will maintain a certain quantity of fish, which feed on algae, in the reservoirs by stocking fish fry into them every year.

Waterworks Chemist of the Water Supplies Department, Mr TANG Ho-wai, says that to ensure an ecological balance and to maintain good water quality, the department will maintain a certain quantity of fish, which feed on algae, in the reservoirs by stocking fish fry into them every year.

Waterworks Chemist of the Water Supplies Department, Mr TANG Ho-wai, says that to ensure an ecological balance and to maintain good water quality, the department will maintain a certain quantity of fish, which feed on algae, in the reservoirs by stocking fish fry into them every year.