earticle

영어

In order to control the exotic fish species that live in the Togyo reservoir using native carnivores fish in Korea, we conducted preliminary investigation and control of the exotic fish species from August 2011 to November 2016. The release of carnivores fish was carried out from the end of May, 2012 to the end of July, 2016, taking into account the closed season of Siniperca scherzeri. The total volume of released of carnivores fish was 1,900 kg for S. scherzeri and 900 kg for Channa argus. Result of control effect analysis of exotic species by carnivores fish, the relative abundance of Lepomis macrochirus population by survey period was 36.65% in the first survey. Thereafter, although the relative abundance repeated the increase and decrease, that was decreased to 0.80% at the final survey. According to the analysis by year, relative abundance of L. macrochirus was 12.83% at first year. Relative abundance was somewhat increased after release of Carnivores Fish. It was 3.92%at final year that was less than 5%. Population of Micropterus salmoides showed a tendency to increase. But this is the result of habitat segregation by interspecific competition with S. scherzeri populations, because M. salmoides, which was mainly inhabited into the reservoir, moved to the edge of the reservoir and influent habitat. Based on the fish survey of the Togyo reservoir, the yearly rank abundance curve was calculated. As a result, the inflowing fish community was disturbed by the inflow of exotic fish species after the release of carnivorous fish, but the fish community in the lake was temporarily disturbed and gradually stabilized at the early stage of carnivorous species release.