Species identification of Chinese sturgeon using acoustic descriptors and ascertaining their spatial distribution in the spawning ground of Gezhouba Dam

Tao, Jiangping; Qiao, Yunfeng; Tan, Xiaoming; Chang, Junjun

doi:10.1007/s11434-009-0557-9

Cited by 17 publications

(29 citation statements)

References 24 publications

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“…The main procedures to identify the echo-signals of Chinese sturgeon were referenced from Zhang et al (2014) . The accuracy for discriminating the echosignals of Chinese sturgeon from those of other targets could reach 90.9% ( Tao et al, 2009 ). The spawning stock size of Chinese sturgeon was estimated using the equations of Qiao et al (2006).…”

Section: Hydroacoustic Survey To Estimate Spawning Stock Sizementioning

confidence: 99%

Impact of the Three Gorges Dam on the spawning stock and natural reproduction of Chinese sturgeon in Changjiang River, China

Gao

Lin

et al. 2016

Chin. J. Ocean. Limnol.

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Chinese sturgeon ( Acipenser sinensis ) is the fl agship species of the Changjiang River. The migration route of this species is blocked by the fi rst dam, the Gezhou Dam, and its reproduction is aff ected by the Three Gorges Dam (TGD), one of the largest dams in the world. We studied the impact of the impoundment of the Three Gorges Reservoir (TGR) since 2003 on the spawning stock and the natural reproduction of the Chinese sturgeon by using our monitoring data from 1997 to 2013. Results indicate that TGR impoundment has delayed the fi rst spawning dates of the fi sh from middle-late October to late November, decreased the amount of spawning activities from twice to only once each year, and signifi cantly reduced egg production. In particular, the fi sh did not demonstrate any spawning activities in 2013. Therefore, TGR impoundment signifi cantly aff ects the natural reproduction of the fi sh downstream of the TGD. The spawning stock size of the fi sh is also predicted to further decrease in the future, which will lead to a risk of population extinction. Ecological regulations must be imposed on decreasing the water temperature to 20°C before mid-October and increasing water discharge downstream of the TGD in October to induce spawning of the Chinese sturgeon.

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Section: Hydroacoustic Survey To Estimate Spawning Stock Sizementioning

confidence: 99%

Impact of the Three Gorges Dam on the spawning stock and natural reproduction of Chinese sturgeon in Changjiang River, China

Gao

Lin

et al. 2016

Chin. J. Ocean. Limnol.

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“…The survey area, from the Grezhouba Dam to the Yanshou Islet, was ~10 km in length with a surface area of ~10 km 2 ( Figure 1). The river width ranged from 600 to 1700 m, and the water depth ranged from 15 to 40 m [15].…”

Section: Data Acquisitionmentioning

confidence: 99%

“…Acoustic surveys were conducted using a SIMRAD EY60 echo sounder, the procedure for which is detailed elsewhere [15]. A description of the sampling data is given in Figure 1 and Table 1.…”

Section: Data Acquisitionmentioning

confidence: 99%

“…The hydroacoustic identification of individual species is at an early stage of development and is limited by serious physical uncertainties [15,16]. We used the contribution (%) of a species to the total catch in gillnet surveys to allocate the relative proportion of species in the acoustic surveys, as described previously [39,40].…”

Section: Accuracy Of Datamentioning

confidence: 99%

“…Conversely, acoustic surveys offer an alternative technique for quantifying fish density, abundance, and size distribution that allows for absolute abundance estimates [14]. However, this type of approach is frequently limited in terms of species identification [15,16] and by highly skewed distributions of fish density [17].…”

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confidence: 99%

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Spatiotemporal patterns of the fish assemblages downstream of the Gezhouba Dam on the Yangtze River

Tao¹,

Gong²,

Tan

et al. 2012

Sci. China Life Sci.

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An explicit demonstration of the changes in fish assemblages is required to reveal the influence of damming on fish species. However, information from which to draw general conclusions regarding changes in fish assemblages is insufficient because of the limitations of available approaches. We used a combination of acoustic surveys, gillnet sampling, and geostatistical simulations to document the spatiotemporal variations in the fish assemblages downstream of the Gezhouba Dam, before and after the third impoundment of Three Gorges Reservoir (TGR). To conduct a hydroacoustic identification of individual species, we matched the size distributions of the fishes captured by gillnet with those of the acoustic surveys. An optimum threshold of target strength of 50 dB re 1 m 2 was defined, and acoustic surveys were purposefully extended to the selected fish assemblages (i.e., endemic Coreius species) that was acquired by the size and species selectivity of the gillnet sampling. The relative proportion of fish species in acoustic surveys was allocated based on the composition (%) of the harvest in the gillnet surveys. Geostatistical simulations were likewise used to generate spatial patterns of fish distribution, and to determine the absolute abundance of the selected fish assemblages. We observed both the species composition and the spatial distribution of the selected fish assemblages changed significantly after implementation of new flow regulation in the TGR, wherein an immediate sharp population decline in the Coreius occurred. Our results strongly suggested that the new flow regulation in the TGR impoundment adversely affected downstream fish species, particularly the endemic Coreius species. To determine the factors responsible for the decline, we associated the variation in the fish assemblage patterns with changes in the environment and determined that substrate erosion resulting from trapping practices in the TGR likely played a key role.

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

Tan

Kang²,

Tao

et al. 2011

Fish Sci

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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.

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Species identification of Chinese sturgeon using acoustic descriptors and ascertaining their spatial distribution in the spawning ground of Gezhouba Dam

Cited by 17 publications

References 24 publications

Impact of the Three Gorges Dam on the spawning stock and natural reproduction of Chinese sturgeon in Changjiang River, China

Impact of the Three Gorges Dam on the spawning stock and natural reproduction of Chinese sturgeon in Changjiang River, China

Spatiotemporal patterns of the fish assemblages downstream of the Gezhouba Dam on the Yangtze River

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

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