중국 Changzhou댐의 방수로 운용에 따른 어류밀도와 분포에 관한 음향조사
A Hydroacoustic Survey Analyzing Fish Populations and Their Distribution Upstream and Downstream of Changzhou Dam, China, Based on Spillway Conditions
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Hydroacoustic surveys were performed to clarify the density and spatial distribution of fish upstream and downstream of Changzhou Dam in the Pearl River, China, with regard to the condition of the spillways. Fish were densely distributed in the forebay of the upstream dam and the average fish density was 0.22 individuals/㎥ under open spillways on 24 June 2010, but when the spillways were closed on 25 June 2010, the fish in the upstream dam dispersed and the average fish density decreased to 0.007 individuals/㎥. Meanwhile, the average fish density in the downstream region was 0.28 individuals/㎥ before the spillway was opened on 24 May 2010, but it decreased to 0.08 individuals/㎥ on 26 June, just after the spillway was closed. The vertical distribution of fish upstream of the dam was not consistent. The target strength (TS) of fish upstream of the dam was larger than that of fish in the downstream region, although the distribution of TS was similar between the upstream and downstream regions. Therefore, we concluded that while numerous fish could swim to the upstream region while the spillways were open, closed spillways obstructed fish migrating upward from the downstream region.
Abstract
Hydroacoustic surveys were performed to clarify the density and spatial distribution of fish upstream and downstream of Changzhou Dam in the Pearl River, China, with regard to the condition of the spillways. Fish were densely distributed in the forebay of the upstream dam and the average fish density was 0.22 individuals/㎥ under open spillways on 24 June 2010, but when the spillways were closed on 25 June 2010, the fish in the upstream dam dispersed and the average fish density decreased to 0.007 individuals/㎥. Meanwhile, the average fish density in the downstream region was 0.28 individuals/㎥ before the spillway was opened on 24 May 2010, but it decreased to 0.08 individuals/㎥ on 26 June, just after the spillway was closed. The vertical distribution of fish upstream of the dam was not consistent. The target strength (TS) of fish upstream of the dam was larger than that of fish in the downstream region, although the distribution of TS was similar between the upstream and downstream regions. Therefore, we concluded that while numerous fish could swim to the upstream region while the spillways were open, closed spillways obstructed fish migrating upward from the downstream region.
참고문헌 (23)
- Aglen A, "Random errors of acoustic fish abundance estimates in relation to the survey grid density applied", FAO Fish Rep, 300, pp.293~298 (1983)
- Blackman SS, "Multiple-target tracking with radar applications", pp.1~464 (1986), Artech House Press
- Chen DQ, "Hydroacoutic study of spatial and temporal distribution of Gymnocypris prezewalskii in QinghaiLake", China Environ Biol Fish, 84, pp.231~239 (2009)
- Coetzee J, "Use of a shoal analysis and patch estimation system(SHAPES) to characterise sardine schools", Aquat Living resour, 13, pp.1~10 (2000)
- Djemali I, "Hydroacoustic fish biomass assessment in man-made lakes in Tunisia: Horizontal beaming importance and diel effect", Aquat Ecology, 43, pp.1121~1131 (2008)
- Frouzova J, "Target strength of European freshwater fish and its dependence on fish body parameters", Fish Res, 75, pp.86~96 (2005)
- Henderson MJ, "Comparison of in situ, ex situ, and backscatter model estimates of Pacific hake(Merluccius productus) target strength", Can J Fish Aquat Sci, 64, pp.1781~1794 (2007)
- 강명희, "Effective and accurate use of difference in mean volume backscattering strength to identify fish and plankton", ICES JOURNAL OF MARINE SCIENCE, 59(4), pp.794~804
- Kang M, "Age characteristics of walleye pollock school echoes", ICES JOURNAL OF MARINE SCIENCE, 63(8), pp.1465~1476 (2006), OXFORD UNIV PRESS
- Kubecka J, "Horizontal beaming as a crucial component of acoustic fish stock assessment in freshwater reservoirs", Aquat Living resour, 16, pp.325~331 (2003)
- Lawson GL, "Species identification of pelagic fish schools on the South African continental shelf using acoustic descriptors and ancillary information", ICES J Mar Sci, 58, pp.275~287 (2001)
- Li YF, "Fisheries resources of the Zhaoqing section the Pearl River", Chinese J Reservoir fishery, 28, pp.80~83 (2008)
- Love RH, "Target strength of a fish at any aspect", J Acoust Soc Am, pp.1397~1403 (1977)
- "Help file 4.90.33 for Echoview"[URL]
- Simmonds EJ, "Fisheries Acoustics: Theory and Practice. 2nd edn", pp.1~437 (2005), Blackwell Science Press
- Soule M, "Performance of a new phase algorithm for discriminating between single and overlapping echoes in a split-beam echo sounder", ICES J Mar Sci, 54, pp.934~938 (1997)
- Steig TW, "Acoustic monitoring of salmonid density, target strength, and trajectories at two dams on the Columbia River, using a split-beam scanning system", Fish Res, 35, pp.43~53 (1998)
- Tan XC, "Survey on fish distribution in the forequarter of the three gorge reservoir using EY60 split-beam echosounder", Chinese J Ecological Sci, 27, pp.329~334 (2008)
- Tan XC, "Observation of the Spawning Aggregation of Megalobrama hoffmanni in the Pearl River", J Fresh Ecology, 24, pp.293~299 (2009)
- Tao JP, "Hydroacoustic observation of fish behavior and spatial patterns in the ship lock and adjacent areas of the Gezhouba Dam, Yangtze River", Acta Ecologica Sinica, 30, pp.233~239 (2010)
- Tao JP, "pecies identification of Chinese sturgeon using acoustic descriptors and ascertaining their spatial distribution in the spawning ground of Gezhouba Dam", Chinese Sci Bull, 54, pp.3972~3980 (2009)
- Thorne RE, "A review of hydroacoustic studies for estimation of salmon downriver migration past hydroelectric facilities on the Columbia and Snake Rivers in the 1980s", Rev Fish Sci, 1, pp.27~56 (1993)
- "Water level data at the Changzhou dam"[URL]