RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (04): 552-559.doi: 10.11870/cjlyzyyhj201604003

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RESOURCE DYNAMIC OF 4 SPECIES OF RARE IMPORTANT FISH IN COASTAL REGION OF THE JINGJIANG SECTION OF THE YANGTZE RIVER

LIU Xiao-xia, ZHOU Tian-shu, TANG Wen-qiao   

  1. Laboratory of Fishes, Shanghai Ocean University, Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai 201306, China
  • Received:2015-01-13 Revised:2015-04-26 Online:2016-04-20
  • Supported by:
    This study was supported by the Special Fund for Agro-Scientific Research in the Public Interest (201203065); the National Natural Science Foundation of China (31472280); the Ministry of Education's Doctoral Discipline Foundation (20123104110006)

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Abstract: To investigate the resource dynamic of four rare and important economic fish i.e. Myxocyprinus asiaticus, Lateolabrax maculatus, Siniperca chuatsi, Channa argus, 2 or 3 samples per month were collected using a stow net along the Jingjiang section of the Yangtze River from 2002 to 2013Totally 379 samples were collected, with the catch yield of 112 587 and 681 080.2 g in weight. The samples were classified into 14 orders, 28 families and 77 genera 119 species. 476 fish belong to the four rare and important economic fish, accounting for 4.23‰ of the total catch yield. This included 224 Siniperca chuatsi the most; followed by 121 Lateolabrax macultus, 96 Channa argus, and 35 Myxocyprinus asiaticus. The 379 samples, Siniperca chuatsi, Channa argus, Lateolabrax macultus and Myxocyprinus asiaticus were caught 93, 83, 38 and 21 times, respectively. The corresponding sample rate were 24.54%, 21.90%, 10.03% and 5.54%. According to IRI, Myxocyprinus asiaticus was a rare species, Lateolabrax macultus the general species, while Siniperca chuatsi and Channa argus were the common species. However, annual IRI data indicated that the general species Myxocyprinus asiaticus and Channa argus had become the dominant species in the past three years. Both species tended to increase in population size. Further analyses suggest that the closed fishing season from April to June could protect 31.43% of Myxocyprinus asiaticus, 29.75% of Lateolabrax macultus, 18.3% of Siniperca chuatsi and 26.04% of Channa argus juvenile fish in Jingjiang section of the Yangtze River. If the closed fishing season extended till September, the figures would increase to 48.57%, 94.21%, 92.86%, 68.75%, respectively.

Key words: Coastal region of the Yangtze River, Siniperca chuatsi, Myxocyprinus asiaticus, Resource dynamic, Resource protection

CLC Number: 

  • S932.4
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