Previously Sword lake where sewage waste. The surrounding restaurants that also pour water discharged into lakes, severely degraded, the food web of the lake changed much.
The Management Board annual Hoan Kiem Lake still drop a certain amount of fish in the lake, in order to landing create food sources for turtles and stable balance of ecosystems, not to the algae and plankton overgrowth causes eutrophication status.
Previously, Hoan Kiem Lake was planted in the lotus pond. in addition to the beautiful landscape, the lotus also provide dissolved oxygen in the water to help breathing organisms.
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