The embellished traffic engineering works Lake area including the clean lakes and lake water changes with the Red River water has caused in the past. Most scientists believe that the turtles will die, and algae in it will no longer. A preliminary study on the pollution status of hoan Kiem Lake and water situation by biologist Professor Ha Dinh Duc presided over Lake water showed hundreds of species of algae are water features, including 33 species not found in other countries. After dredging the Lake from September to November 1993, the German Professor Dr. lake water color Lath comment moved from green to blue to dull, dirty, and dark blue in the middle of the Lake. In the research paper "sword Lake algae micro system" by Professor Rajesh Yang (1994) compare: micro-algae species list in previous sword Lake (1982, 1989, 1991) and the time of the time discrepancy, especially the ones that Scenedesmus species in the genus. Not caught the endemic species: pseudoarmatus Hortob Scenedemus Hortob Pocssi, Scenedesmus, Scenedesmus pseudocopoliensis Hortob. Species Pediastrum tetras (Ehr.) Ralfts var vacum Hortob can't see during the observation and identification.
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