Effects of Environmental Factors on Natural Reproduction of the Four Major Chinese Carps in the Yangtze River, China

Li, Mingzheng; Gao, Xin; Yang, Shaorong; Duan, Zhonghua; Cao, Weiguo; Liu, Huanzhuang

doi:10.2108/zsj.30.296

Cited by 34 publications

(38 citation statements)

References 37 publications

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“…By monitoring changes in several environmental variables associated with reproduction of the four Chinese major carps, Li found that a water temperature range of 18-24°C, especially coupled with a diurnal increase in the water level greater than 0.55 m day -1 , favored spawning activities. The results of that study indicated that the drifting density of the eggs of these four species was mainly influenced by diurnal variations in water levels and water discharge [24].…”

Section: Reproduction Strategiesmentioning

confidence: 91%

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

Liu

et al. 2014

Fish Sci

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Section: Reproduction Strategiesmentioning

confidence: 91%

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

Liu

et al. 2014

Fish Sci

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“…A number of studies have indicated that the operation of the Three Gorges Reservoir has influenced river discharge and sediment transport in the Yangtze River basin. All of these changes will strongly affect fish communities in the Yangtze River (Li, Gao et al ., ; Sun, Huang, Opp, Hennig, & Marold, ).…”

Section: Introductionmentioning

confidence: 99%

The eco‐hydrologic influence of the Three Gorges Reservoir on the abundance of larval fish of four carp species in the Yangtze River, China

Ban

Chen

Pan³

et al. 2016

Ecohydrology

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The natural abundance of larval fish of four carp species has been affected adversely by the Three Gorges Reservoir in the Yangtze River. One of the methods to conserve fish is to regulate hydrology regimes to keep them optimal for species spawning. Thirty‐two hydrologic indicators (HIs) associated with the hydrologic regime of the spawning sites at the Jianli reach were analyzed with the range of variability approach. Outputs were correlated with abundance of larval fish by a genetic programming approach to explore the relationship between the hydrologic regime and fish abundance. Results showed that rate of rise for discharge and average monthly discharge in June, October, and December; rate of rise for water level, average monthly water level in May, June, July, October, and November, and 1‐, 3‐, 7‐, and 30‐day maximum water level; and high pulse duration for sediment concentration and average monthly sediment concentration in June, July, and October were key factors that affected fish species abundance. All of these HIs changed greatly after impoundment of the Three Gorges Reservoir since 2003. Discharge and water level played the dominant role in reproduction of four carp species when the change of sediment concentration kept stable. However, when the sediment concentration declined over the limited range, it replaced discharge and water level as having the dominant role in reproduction. Two relationships between abundance of larval fish and HIs were identified from genetic programming results to explore an indicator impact matrix for use in eco‐hydrologic management through change of some HIs to improve fish abundance.

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“…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%

“…Eggs were incubated in a tank (20 cm diameter and 18 cm high) for 6-10 days and identifi ed to species level. Water temperature was maintained at 22-24°C with air conditioning, each aquarium was stocked with 5-10 eggs at the same development stage, and the water was aerated (see also Li et al, 2013). The larvae were preserved in 5% sodium phosphate-buff ered formalin (Kelso and Rutherford, 1996).…”

Section: Eggs and Larvae Samplingmentioning

confidence: 99%

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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Effects of Environmental Factors on Natural Reproduction of the Four Major Chinese Carps in the Yangtze River, China

Cited by 34 publications

References 37 publications

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

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

The eco‐hydrologic influence of the Three Gorges Reservoir on the abundance of larval fish of four carp species in the Yangtze River, China

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

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