Analysis of fish eggs and larvae flowing into the Three Gorges Reservoir on the Yangtze River, China

Mu, Hongxia; Li, Mingzheng; Liu, Huanzhang; Cao, Weiguo

doi:10.1007/s12562-014-0729-7

Cited by 18 publications

(18 citation statements)

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“…We assumed that all eggs and larvae in the water column were carried past the sampled river section and that no eggs and larvae remained in the vicinity of the sampled section (Martin and Paller, 2008). The numbers of eggs and larvae transported over time at each sample transect were calculated by averaging the numbers of eggs and larvae transported between each pair of consecutive sampling occasions, multiplying this mean by the elapsed time between sampling occasions, and summing the intervals (Yi et al, 1988;Martin and Paller, 2008;Mu et al, 2014). No eff ort was made to compensate for potential diel fl uctuations in egg and larval abundance.…”

Section: Discussionmentioning

confidence: 99%

“…No eff ort was made to compensate for potential diel fl uctuations in egg and larval abundance. This method has been used in many other studies (Yi et al, 1988;Robinson et al, 1998;Copp et al, 2005;Martin and Paller, 2008;Jiang et al, 2010;Mu et al, 2014). The total numbers of eggs and larvae were calculated according to the following formulae (see also Mu et al, 2014),…”

Section: Discussionmentioning

confidence: 99%

“…The spawning grounds of the four major Chinese carps were determined using the formula (see also Mu et al, 2014),…”

Section: Discussionmentioning

confidence: 99%

“…A mechanical fl ow meter was attached to the mouth of the net to calculate the water volume fi ltered during sampling. Routine sampling was conducted near the shore because of the high current velocity in the middle of the river (see also Li et al, 2013;Mu et al, 2014).…”

Section: Eggs and Larvae Samplingmentioning

confidence: 99%

“…A conical net (2 m long, 0.5 m in diameter, with 500 μm in mesh size) was used to sample on the transect (Jiang et al, 2010). Five special sites (I, II, III, IV, and V) were set evenly along the river transect, each with three water depths ( Fig.2) (see also Mu et al, 2014). The routine sampling sites (sites I 1 and V 1 ) were among the transect sampling sites.…”

Section: Eggs and Larvae Samplingmentioning

confidence: 99%

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Impact of the Three Gorges Dam on reproduction of four major Chinese carps species in the middle reaches of the Changjiang River

Duan

Gao

et al. 2016

Chin. J. Ocean. Limnol.

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Silver carp ( Hypophthalmichthys molitrix ), bighead carp ( Aristichthys nobilis ), grass carp ( Ctenopharyngodon idella ), and black carp ( Mylopharyngodon piceus ) are the four major Chinese carps and are commercially important aquaculture species in China. Reproduction of these carp has declined since the construction of the Three Gorges Dam (TGD) due to an altered water fl ow and thermal regime in the Changjiang (Yangtze) River. However, details of the changes in reproduction of the four species are not well understood. To assess the impact of the TGD on reproduction of the four carp, we investigated their eggs and larvae at Yidu City, which is 80 km below the TGD, during 2005-2012. We examined diff erences in larval abundance of the four species in the Jianli section (350 km downstream of the TGD) before (1997)(1998)(1999)(2000)(2001)(2002) and after (2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012) construction of the TGD. Based on these observations, the fi rst spawning date of the four species was delayed a mean of about 25 days after the dam was constructed. Mean egg abundance in the Yidu section of the river was 249 million and mean larval abundance was 464 million, which were signifi cant decreases since the 1980s. Moreover, larval abundance in the Jianli section after the dam was constructed was signifi cantly lower than that before construction (ANCOVA, P <0.05). The observed larval abundance accounted for only 24.66% of the predicted value in 2003 when the dam was fi rst inundated. The present spawning grounds between the TGD and Yidu section of the river are very similar to those described in the 1980s, and some spawning grounds exist upstream of the TGD. Large free-fl owing stretches upstream of the TGD and the creation of artifi cially fl ooded downstream reaches are needed to stimulate spawning and eff ectively conserve these four major Chinese carps species.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…The spawning grounds of the four major Chinese carps were determined using the formula (see also Mu et al, 2014),…”

Section: Discussionmentioning

confidence: 99%

Section: Eggs and Larvae Samplingmentioning

confidence: 99%

Section: Eggs and Larvae Samplingmentioning

confidence: 99%

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Impact of the Three Gorges Dam on reproduction of four major Chinese carps species in the middle reaches of the Changjiang River

Duan

Gao

et al. 2016

Chin. J. Ocean. Limnol.

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Connectivity and flow regime direct conservation priorities for pelagophil fishes

Mollenhauer

Brewer

Perkin

et al. 2021

Aquatic Conservation

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1. Dam construction threatens global aquatic biodiversity by fragmenting stream networks and altering flow regimes. The negative effects of dams are exacerbated by increased drought periods and associated water withdrawals, especially in semi-arid regions. Stream fishes are particularly threatened owing to their mobile nature and requirement for multiple habitats to complete their life cycles. An understanding of relationships with fragmentation and flow regimes, particularly as coarse-scale (e.g. catchment) constraints on species distributions, is essential for stream fish conservation strategies. Prairie chub (Macrhybopsis australis) is a small-bodied minnow (Cyprinidae) with poorly understood ecology endemic to the North American Great Plains.Suspected declines in abundance and extirpations have resulted in conservation interest for prairie chub at state and federal levels. Prairie chub is thought to share its reproductive strategy with pelagic-broadcast spawning minnows (pelagophils). Freshwater pelagic-broadcast spawning fishes have been disproportionately affected by fragmentation and streamflow alteration globally.3. Relationships of prairie chub occurrence with coarse-scale fragmentation and streamflow metrics were examined in the upper Red River catchment. Occurrence probability was modelled using existing survey data, while accounting for variable detection. The modelled relationships were used to project the distribution of prairie chub in both a wet and dry climatic period.4. The probability of prairie chub occurrence was essentially zero at sites with higher densities of upstream dams, but increased sharply with increases in flow magnitude, downstream open mainstem, and flood duration. The projected distribution of prairie chub was broader than indicated by naïve occurrence, but similar in both climatic periods. The occurrence relationships are consistent with the hypotheses of pelagic broadcast spawning and represent coarse-scale constraints that are useful for identifying areas of the stream network with higher potential for finer-scale prairie chub conservation and recovery efforts. In addition to informing pelagophil conservation, the relationships are also applicable to pelagic-broadcast spawning fishes in marine environments.

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eDNA metabarcoding reveals differences in fish diversity and community structure in heterogeneous habitat areas shaped by cascade hydropower

Cheng

Luo

Zhang

et al. 2023

Ecology and Evolution

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Freshwater ecosystems are under great threat from humans, among which habitat heterogeneity is the most obvious, being one of the important reasons for the decline of fish diversity. This phenomenon is particularly prominent in the Wujiang River, where the continuous rapids of the mainstream have been divided into 12 mutually isolated sections by 11 cascade hydropower reservoirs. Based on the fact that conventional survey methods are more harmful to the ecological environment, the efficient and noninvasive environmental DNA metabarcoding (eDNA) approach was used in this study to conduct an aquatic ecological survey of the 12 river sections of the mainstream of the Wujiang River. A total of 2299 operational taxonomic units (OTUs) were obtained, corresponding to 97 species, including four nationally protected fish species and 12 alien species. The results indicate that the fish community structure of the Wujiang River mainstream, which was originally dominated by rheophilic fish species, has been changed. And there are differences in fish species diversity and species composition among the reservoir areas of the mainstream of the Wujiang River. The fish species in the area have gradually declined under the influence of anthropogenic factors such as terraced hydropower and overfishing. The fish populations consequently have demonstrated a tendency to be species miniaturized, and the indigenous fish are severely threatened. In addition, the fish composition monitored by the eDNA approach was found to be close to the fish composition of historical information on the Wujiang River, indicating that eDNA approach may be used as a complementary tool to conventional methods in this basin.

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Analysis of fish eggs and larvae flowing into the Three Gorges Reservoir on the Yangtze River, China

Abstract: Studies on fish eggs and larvae

Cited by 18 publications

References 20 publications

Impact of the Three Gorges Dam on reproduction of four major Chinese carps species in the middle reaches of the Changjiang River

Impact of the Three Gorges Dam on reproduction of four major Chinese carps species in the middle reaches of the Changjiang River

Connectivity and flow regime direct conservation priorities for pelagophil fishes

eDNA metabarcoding reveals differences in fish diversity and community structure in heterogeneous habitat areas shaped by cascade hydropower

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