In order to use fundamental data for conservation of species diversity and stream health with
dam development, fish investigation in up- and downstream of Pyeonglim Dam was
seasonally conducted in 2007~2008. In addition, data of water qualities, investigated for
environmental impact assessment, were used to determine a water quality standard level in
Pyeonglim Stream, and it revealed that water environment condition was good in the stream.
During the study period, a total number of fish caught from the 4 study sites was 5,449
representing 9 families 25 species, and there were 8 Korean endemic species (32.0%) including
Rhodeus uyekii, Squalidus gracilis majimae, and Microphysogobio yaluensis. Two species of Zacco
temminckii (37.5%) and Zacco platypus (26.3%) were dominant and subdominant in all sites.
There were few individuals of the 2nd-class endangered species (Sand lamprey, Lampetra
reissneri) and the introduced species (Bluegill, Lepomis macrochirus), found in the upstream of the
dam. and further investigation for conservation of the endangered species and for prevention of
the introduced species is needed in future. With fish fauna and multi-metric health assessment
model in each sampling attempt, index of biotic integrity(IBI) was evaluated and it resulted
mostly in good(26~35) and excellent(36~40) condition in all sites. The results indicate that it is
very important to study not only environmental impact assessment with fish composition but
also stream health assessment in order to conserve healthy aquatic ecosystem.