In order to control algal bloom, which causes environmental problems such as eutrophication
in freshwater ecological environments, many attempts have recently been made using biological approaches.
Among them is filtration using bivalve. Algae control with filter-feeding bivalves is emerging as an eco-friendly
method. In this study, bivalves collected at Baekje weir in Geum River in Korea from Jun to Sep 2020 were tested
to find out the possibility of algae control using filter-feeding bivalves through laboratory experiments. The Unio
douglasiae, Anodonta woodiana, and Anodonta arcaeformis collected from Baekje weir were put into a water
tank (2 L) containing Clorella vulgaris, and as a result, the average filtration rate was 95.9% per animal after 24
hrs. Calculating this with the Chl-a concentration converted to a calibration curve, it was found that the average
of 154.84 μg L-1 of Chl-a was reduced. Based on this calculation, the possibility that one bivalve can eliminate
Chl-a in one month is 0.0005%. It is expected that the effect is 20.14% when there are 40,000 animals. These
results indirectly showed how effective bivalve’s ability to control Chl-a in their habitat is. Although this study
was limited to calculating the algae control ability of aquatic ecosystem based on the filtration rate of bivalve
and the corresponding Chl-a reduction rate, it is thought that it will be used as basic data for integrated research
from various factors and viewpoints (phytoplankton, aquatic plants, benthic organisms, and sediments) through
additional research.