RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (09): 1309-1316.doi: 10.11870/cjlyzyyhj201609001

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AN ESTIMATE OF EXPLOITATION RATE OF ANGUILLA JAPONICA ELVERS UPSTREAM RUNNING ACROSS WATERS OF YANGTZE ESTUARY

HOU Jun-li, WANG Yu, ZHANG Tao, YANG Gang, GAO Yu, ZHAO Feng, ZHUANG Ping   

  1. Scientific Observing and Experimental Station of Fisheries Resources and Environment of East China Sea and Yangtze Estuary, Ministry of Agriculture;East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090
  • Received:2015-12-16 Revised:2016-05-25 Online:2016-09-20
  • Supported by:
    Special Fund for Agro-scientific Research in the Public Interest(201203065)

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Abstract: Based on the daily catch data of Anguilla japonica elvers of DFXS station (121°15'45"E, 31°40'18"N) in the west waters of south branch of Yangtze Estuary from December 2014 to March 2015, the number of shoals immigrated upstream was determined by CPUE fluctuation analyses, and their resource indices were estimated by the Leslie method and Delury method. The present study indicated that there were six dominant elver shoals immigrated upstream, and these two methods were found to produce the same result of shoal fluctuant features in this period. The duration of fishing days for each shoal was different. The longest period lasted for 27 days, while the shortest one lasted only 5 days. The average fishing period was 10.17 days. Their exploitation rate estimated by the Leslie method reached 43.38%-96.30% with an average of 77.14%, and that estimated by the Delury method reached 43.36%-105.37% with an average of 81.43% of the initial immigrating population size. The exploitation rates of elvers in the DFXS station upstream were at high levels. High exploitation rates of elvers suggested that the approach of stake-set stow net in DFXS station waters reduced numbers of elver upstream and influenced adult resources of Anguilla japonica in the Yangtze Basin. The average daily fishing mortality coefficient and average daily fishing mortality rate of DFXS station waters estimated by Leslie method were 0.23 and 20.02%, respectively, lower than that estimated by the Delury method (0.27 and 22.79%, respectively). Fishing mortality coefficient is very useful for estimating Anguilla japonica elvers resources of waters of Yangtze Estuary.

Key words: Anguilla japonica elvers, upstream running, immigrating shoal, initial population size, exploitation rate, fishing mortality coefficient

CLC Number: 

  • S932.4
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