RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (09): 1369-.doi: 10.11870/cjlyzyyhj201709009

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ESTIMATION OF GROWTH AND POPULATION PARAMETERS OF Pseudobrama simoni (BLEEKER) AT JINGJIANG SECTION OF THE YANGTZE RIVER

GUO Hong-yi1, WEI Kai2, TANG Wen-qiao1, ZHANG Xu-guang1, ZHOU Tian-shu1, LIU Dong1 LI Hui-hua1, SHEN Lin-hong3   

  1. (1. Shanghai Universities Key Laboratory of Marine Animal Taxonomy and Evolution,Shanghai Ocean University,Shanghai 201306, China; 2 Beijing Aquatic Wildlife Rescue and Conservation Center, Beijing 102100, China; 3. Administration of Fishery of Jingjiang, Jingjiang  214500,China)
  • Online:2017-09-20

Abstract: A total of 2 334 samples of Pseudobrama simoni (Bleeker) were collected at the Jingjiang section of the Yangtze River between January 2012 and December 2013. Those fish samples length data were measured, and the ELEFAN I technique was used to estimate growth and population dynamics parameters. The relationship between the fish body length (cm) and body weight (g) can well fit by the power function, W=00182×L2984. Growth of this species could be described through a von Bertalanffy mode, and the estimated parameters were: asymptotic length (L∞=1925cm), growth constant (K=02 year) and age at length 0 (t0= -159 year). Fish growth turning point for body mass growth curve of the stock was calculated as ti =355 year-1. Natural mortality coefficient (M) was estimated by Pauly’s empirical equation and could account for 0556 year-1. Length-converted catch curves were applied to estimate the total mortality coefficient (Z), which was found as 1638 year-1. Consequently, the fishing mortality coefficient (F) was calculated as 1082 year-1, and the current exploitation rate (E) was 066 year-1. Between 2012 and 2013, the average stock of Pseudobrama simoni at the Jingjiang section of the Yangtze River was estimated 12059 tons, with a number of 9 474 000 individuals. The results in this study showed that Pseudobrama simoni in the Jingjiang section has been over-exploited. In order to effectively protect P. simoni population along the coastal water, properly longer fishing ban period (from April to September) might be required in those coastal sections.

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