scholarly journals Native bighead carp Hypophthalmichthys nobilis and silver carp Hypophthalmichthys molitrix populations in the Pearl River are threatened by Yangtze River introductions as revealed by mitochondrial DNA

2020 ◽  
Vol 96 (3) ◽  
pp. 651-662 ◽  
Author(s):  
Chao Li ◽  
Junjie Wang ◽  
Jiaqi Chen ◽  
Kevin Schneider ◽  
Radhakrishnan K. Veettil ◽  
...  
Keyword(s):  
Mitochondrial Dna ◽  
Yangtze River ◽  
Silver Carp ◽  
Bighead Carp ◽  
Pearl River ◽  
Hypophthalmichthys Molitrix ◽  
Hypophthalmichthys Nobilis ◽  
The Pearl River

Fishery Resources, Environment, and Conservation in the Mississippi and Yangtze (Changjiang) River Basins

2016 ◽  
Keyword(s):  
Water Quality ◽  
Mississippi River ◽  
Yangtze River ◽  
Silver Carp ◽  
River Basins ◽  
Bighead Carp ◽  
The Yangtze River ◽  
Changjiang River ◽  
Hypophthalmichthys Nobilis ◽  
Anthropogenic Modifications

<em>Abstract</em>.—Bighead Carp <em>Hypophthalmichthys nobilis </em>and Silver Carp <em>H. molitrix </em>are native in the Yangtze River and extremely important economically and culturally as food fishes; however, the two species have declined due to overfishing and anthropogenic modifications to hydrology and water quality. Bighead Carp and Silver Carp were imported to North America in the early 1970s, escaped confinement, and have now become undesirable and problematic invasive species. The two carps have become the most abundant fish species in many portions of their invaded range, which continues to expand. We compare the biology, status, and management of these species between their natal range in the Yangtze River and their invaded habitats of the Mississippi River basin.

Mitochondrial DNA diversity, population structure, and conservation genetics of four native carps within the Yangtze River, China

1997 ◽  
Vol 54 (1) ◽  
pp. 47-58 ◽  
Author(s):  
G Lu ◽  
S Li ◽  
L Bernatchez
Keyword(s):  
Mitochondrial Dna ◽  
Population Structure ◽  
Grass Carp ◽  
Yangtze River ◽  
Juvenile Fish ◽  
Silver Carp ◽  
Bighead Carp ◽  
The Yangtze River ◽  
Black Carp ◽  
Dna Diversity

Silver carp (Hypophthalmichthys molitrix), grass carp (Ctenopharyngodon piceus), bighead carp (Aristichthys nobilis), and black carp(Mylopharyngodon piceus) rank first, second, fourth, and seventh in world fish production. In China, the Yangtze River harbours the most important natural populations of these species. We performed a polymerase chain reaction - restriction fragment length poymorphism analysis on 365 juvenile fish representing three nursery grounds to provide a first assessment of the mitochondrial DNA diversity in these species and test the hypothesis that they are composed of more than one genetic stock. The mitochondrial DNA diversity was high in silver, bighead, and black carp, and much less in grass carp. Analysis of heterogeneity of genotype frequency, fixation indices, intersite molecular variance, and localization indices indicated that juvenile silver, bighead, and black carp from different nursery areas belong to genetically distinct populations. These results suggest that their population structure may be determined by the number of environmental settings that permit closure of their life cycle. They also imply that carp from the Yangtze River cannot be managed as a single unit and that human disturbance through exploitation and habitat modifications, in particular the construction of the Three Gorges Dam, will have differential impacts on fish abundance for different parts of the river.

scholarly journals Elevated Temperatures Shorten the Spawning Period of Silver Carp (Hypophthalmichthys molitrix) in a Large Subtropical River in China

2021 ◽  
Vol 8 ◽  
Author(s):  
Yuguo Xia ◽  
Xinhui Li ◽  
Jiping Yang ◽  
Shuli Zhu ◽  
Zhi Wu ◽  
...  
Keyword(s):  
Time Series ◽  
Elevated Temperatures ◽  
Silver Carp ◽  
Pearl River ◽  
Fish Reproduction ◽  
Hypophthalmichthys Molitrix ◽  
Spawning Period ◽  
Start Date ◽  
Suitability Index ◽  
The Pearl River

Global warming is influencing the life history traits of fishes globally. However, the impacts of elevated temperature on fish reproduction are diverse in different regions. Previous studies have revealed that the spawning timing of silver carp (Hypophthalmichthys molitrix) in the Pearl River, in China, has changed over the past decade. However, few studies have explored the potential reasons, which are critical for determining fishing-moratorium periods and developing sustainable fisheries. The current study used discharge suitability index (DSI), temperature suitability index (TSI), correlation and time-series analyses to determine (i) the optimal discharge and temperature for silver carp spawning; (ii) relationships among the thermal regime, hydrological parameters, and spawning timing based on an 11-year time-series dataset. Our results indicated that the most suitable discharge and temperature for silver carp spawning were 13,000–15,000 m3/s and 25–26°C, respectively. The start date of spawning fluctuated with a slight tendency to delay, while the spawning peak and end date obviously occurred earlier during the study period. Correlation analyses suggested that the increasing average temperature between January and March likely caused the initial spawning delay. Moreover, elevated temperatures in August and September probably promoted the anticipated end of silver carp spawning. However, increases in discharge did not significantly correlate with the start of spawning but were significantly and positively correlated with the spawning peak. These results indicated that elevated temperatures shorten the spawning period of silver carp in the Pearl River. Moreover, the initial spawning of silver carp seems to be triggered by temperature rather than changes in discharge; flow pulses can probably create more suitable spawning niches for H. molitrix. This study enhances our understanding of the effect of warming on fish reproduction in subtropical regions.

Comparison of high-throughput sequencing analysis of gut contents between silver carp Hypophthalmichthys molitrix and bighead carp Hypophthalmichthys nobilis in mesotrophic and eutrophic lakes

2020 ◽  
Vol 71 (7) ◽  
pp. 761
Author(s):  
Chaoqun Su ◽  
Wenjing Hu ◽  
Zhongjun Hu ◽  
Zhen Zhang ◽  
Oranich Wedchaparn ◽  
...  
Keyword(s):  
High Throughput ◽  
High Throughput Sequencing ◽  
Lake Taihu ◽  
Silver Carp ◽  
Bighead Carp ◽  
Gut Contents ◽  
Sequencing Analysis ◽  
Hypophthalmichthys Molitrix ◽  
Eutrophic Lakes ◽  
Hypophthalmichthys Nobilis

High-throughput sequencing analysis of gut contents was used to study the feeding habits of two filter-feeding fish, namely silver carp Hypophthalmichthys molitrix and bighead carp Hypophthalmichthys nobilis, in mesotrophic Lake Qiandao and eutrophic Lake Taihu. Silver carp feed primarily on phytoplankton, with a feeding preference for Chlorophyta, in Lake Qiandao and rely on phytoplankton in Lake Taihu. Bighead carp feed more on zooplankton in Lake Qiandao and on phytoplankton in Lake Taihu. With increasing levels of algae, bighead carp feed more on phytoplankton. The dietary shifts suggest that bighead carp would be useful in controlling nuisance algae in lakes.

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