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보분: 인공호의 부영양화에 따른 피라미 (Zacco platypus) 개체군의 전장-체중 관계 및 비만도 지수
고대근 ( Dae Geun Ko ),한정호 ( Jeong Ho Han ),안광국 ( Kwang Guk An ) 한국하천호수학회 2012 생태와 환경 Vol.45 No.2
The objective of this study was to determine the weight-length relations and condition factor (K) of Zacco platypus, along the trophic gradients from oligotrophic to eutrophic state in six reservoir ecosystems (BaR, YyR, JyR, GpR, YdR, and MsR), during 2008~2010. The species was selected as a sentinel species for the study, due to its wide distribution and wide trophic gradient. The analysis of trophic state index (TSI), based on total phosphorus (TP) and chlorophyll-a (Chl-a), indicated that reservoirs of YyR and BaR were classified as to be in an oligotrophic state (30~40), the JyR and GpR as mesotrophic (40~50), and the YdR and MsR as eutrophic state (50~70). Total 47 species and 26,226 individuals were sampled from 6 reservoirs and sensitive species dominated in the oligotrophic reservoirs (YyR and BaR). In the mean time, the tolerant speciesdominated the community in the mesotrophic (JyR and GpR) and eutrophic (YdR and MsR) reservoirs. Regression analysis of body weight, against the total length, indicated that the regression coefficient (b value) was lower in the ligotrophic reservoir (2.77~2.79) than the mesotrophic (3.07~3.17) and eutrophic reservoirs (3.15~3.21). This result suggests that the population growth rate Zacco platypus reflected the trophic gradients of the reservoirs. The analysis of condition factor (K) against the total length showed positive slopes (b¤3.0) in mesotrophic and eutrophic reservoirs, and a negative slope (b/3.0) in oligotrophic reservoir. The variation of the regression slope of "b" in Z. platypus was accounted for 79.7% [b=0.012×TSI (TP)+2.395, p=0.017] by the variation of TSI (TP) and 82.2% [b=0.013×TSI (Chl-a)+2.36, p=0.013] by the variation of TSI (Chl-a). The proportion of DELT abnormality increased as the trophic state increases in the reservoirs. The overall data suggest that the growth of the fish populations, based on the length-weight relations and condition factor, reflected the trophic state of nutrient and phytoplankton biomass of the reservoir waters. Thus, in spite of the tolerant characteristics of Z. platypus, hypertrophic states might negatively affect the health of the population.
연구논문 : 죽산보의 어도에서 트랩 샘플링 기법을 이용한 하절기, 일주기별 어류 이동성 평가
한정호 ( Jeong Ho Han ),고대근 ( Dae Geun Ko ),임병진 ( Byung Jin Lim ),박종환 ( Jong Hwan Park ),안광국 ( Kwang Guk An ) 한국환경영향평가학회 2012 환경영향평가 Vol.21 No.6
The objective of this study was to evaluate seasonal patterns and diel variations of fish movements in the Juksan Weir which was constructed in 2010 at the down-stream of Yeongsan- River watershed. For this study, we monitored day-and-night movement(24 Hr cycle) and seasonal fish migration(June ~ August) patterns in 2011 along with species compositions and abundances depending on the locations of the traps within the fishway. Total number of species sampled was 14 and the total number of individuals was 1,263 with only the size-fractions(as total length) of the fish < 20 cm during the study. Seasonal analysis of fish movement in the fish way showed that highest frequency in the movement occurred in June - July, which is closely associated with a spawning peak season. The most dominant species using the fishway was Squalidus chankaensis tsuchigae, and this species turned out to be 26.9% of the total in the use rate of fishway. Daily monitoring of fish movements showed that most frequent movements occurred between 18:00 PM and 21:00 PM when the fish have a feeding time generally. The migratory fish were not found in the fishway during the study. Mean current velocity during the study 0.42 ± 0.02 ms-1(n = 42), and there were no significant statistical differences(p > 0.05) among the daily and monthly velocities in the fishway. The use rate of fish passage, in terms of fish species, was 48%, compared with total sampling of fish species(29 species) at the down- river regions during the same period, indicating a low use rate. Further continuous long-term monitoring should be conducted to evaluate the impacts of the weir construction in the river.