Hydroacoustic survey of fish density, spatial distribution, and behavior upstream and downstream of the Changzhou Dam on the Pearl River, China

Hydroacoustic surveys were conducted to understand the relationship between fish density, spatial distribution, and behavior upstream and downstream of the Changzhou Dam on the Pearl River, China, and the condition (open/closed) of the spillways. When the spillways were open on 24 June 2010, numerous fish were observed to be densely distributed in the forebay upstream of the dam, with an average fish density was 0.22 fish m−3. When the spillways were closed on 25 June 2010, the fish upstream of the dam dispersed, and the average fish density decreased to 0.007 fish m−3. Prior to operating the spillways on 24 May 2010, the average fish density downstream of the dam was 0.28 fish m−3; in comparison, on 26 June, immediately following closure of the spillways, the average fish density downstream of the dam was 0.08 fish m−3. Fish were more active on June 24 than on 25 June: they swam faster and their positions in the water column varied greatly. On 26 June, fish did not to swim as freely in the water column as those measured on 24 May. Based on these observations, we conclude that a large number of fish are able to swim to the upstream side of the dam while the spillways are open.

[1]  R. H. Love.  Target strength of an individual fish at any aspect , 1977 .

[2]  K. Mackenzie.  Nine‐term equation for sound speed in the oceans , 1981 .

[3]  R. Francois,et al.  Sound absorption based on ocean measurements: Part I: Pure water and magnesium sulfate contributions , 1982 .

[4]  A. Aglen.  Random errors of acoustic fish abundance estimates in relation to the survey grid density applied , 1983 .

[5]  Samuel S. Blackman,et al.  Multiple-Target Tracking with Radar Applications , 1986 .

[6]  R. E. Thorne,et al.  A review of hydroacoustic studies for estimation of salmonid downriver migration past hydroeiectric facilities on the Columbia and Snake Rivers in the 1980s , 1993 .

[7]  Manuel Barange,et al.  Performance of a new phase algorithm for discriminating between single and overlapping echoes in a split-beam echosounder , 1997 .

[8]  Tracey W. Steig,et al.  Acoustic monitoring of salmonid density, target strength, and trajectories at two dams on the Columbia River, using a split-beam scanning system , 1998 .

[9]  Jan Kubečka,et al.  Horizontal beaming as a crucial component of acoustic fish stock assessment in freshwater reservoirs , 1998 .

[10]  F. Schiemer,et al.  Acoustic study of fish and invertebrate behavior in a tropical reservoir , 2003 .

[11]  D. Schindler,et al.  Changes in the Spatial Distribution of Fishes in Lakes Along a Residential Development Gradient , 2004, Ecosystems.

[12]  J. Frouz,et al.  Target strength of some European fish species and its dependence on fish body parameters , 2005 .

[13]  E. John Simmonds,et al.  Fisheries Acoustics: Theory and Practice , 2005 .

[14]  P. Brehmer,et al.  Fisheries Acoustics: Theory and Practice, 2nd edn , 2006 .

[15]  J. Guillard,et al.  Hydroacoustic fish biomass assessment in man-made lakes in Tunisia: horizontal beaming importance and diel effect , 2009, Aquatic Ecology.

[16]  Tan Xichang,et al.  Survey on Fish Distribution in the Forequarter of the Three Gorge Reservoir Using EY60 Split-beam Echosounder , 2008 .

[17]  D. S. Pavlov,et al.  Ecological and behavioural influences on juvenile fish migrations in regulated rivers: a review of experimental and field studies , 2008, Hydrobiologia.

[18]  John G. Williams,et al.  Response of downstream migrant juvenile Pacific salmonids to accelerating flow and overhead cover , 2008, Hydrobiologia.

[19]  J. Kubečka,et al.  The effect of hydropower on fish stocks: comparison between cascade and non-cascade reservoirs , 2008, Hydrobiologia.

[20]  X. Tan,et al.  Hydroacoustic study of spatial and temporal distribution of Gymnocypris przewalskii (Kessler, 1876) in Qinghai Lake, China , 2008, Environmental Biology of Fishes.

[21]  Jianbo Chang,et al.  Acoustic Observation of the Spawning Aggregation of Megalobrama hoffmanni in the Pearl River , 2009 .

[22]  J. Kubečka,et al.  The effect of depth, distance from dam and habitat on spatial distribution of fish in an artificial reservoir. , 2009 .

[23]  Jianbo Chang,et al.  Species identification of Chinese sturgeon using acoustic descriptors and ascertaining their spatial distribution in the spawning ground of Gezhouba Dam , 2009 .

[24]  David M. Warner,et al.  The Lake Huron pelagic fish community: persistent spatial pattern along biomass and species composition gradients , 2009 .

[25]  Jianbo Chang,et al.  Hydroacoustic observation of fish spatial patterns and behavior in the ship lock and adjacent areas of Gezhouba Dam, Yangtze River , 2010 .