Recruitment Pattern, Virtual Population Analysis (VPA) and Exploitation Status of Coilia nasus Exploited in the Poyang Lake through the Yangtze River Waterway, Jiangxi Province, China  

Bin W. , Chunlin F. , Huiyun F. , Peifeng F. , Huiming Z. , Yanping Z. , Gang H. , Sheng W.
(Fisheries Research Institute of Jiangxi Province, Scientific Observing and Experimental Station of Fishery Resources and Environment in Poyang Lake,Ministry of Agriculture,Nanchang, China)
Author    Correspondence author
International Journal of Marine Science, 2015, Vol. 5, No. 56   doi: 10.5376/ijms.2015.05.0056
Received: 29 Jul., 2015    Accepted: 28 Aug., 2015    Published: 20 Oct., 2015
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Bin W., Chunlin F., Huiyun F., Peifeng F., Huiming Z., Yanping Z., Gang H., Sheng W.., 2015, Recruitment Pattern, Virtual Population Analysis (VPA) and Exploitation Status of Coilia nasus Exploited in the Poyang Lake through the Yangtze River Waterway, Jiangxi Province, China, International Journal of Marine Science, 5(56): 1-5 (doi:10.5376/ijms.2015.05.0056)

Abstract

In order to ascertain the population dynamics of Coilia nasus, a study was conducted to investigate the growth parameters, mortality and recruitment pattern of C. nasus collected in the Poyang Lake through the Yangtze River Waterway fish landing site, northern part of the Poyang Lake. C. nasus were collected from April to July (C. nasus Only can be fished in reproductive season in the Poyang Lake through the Yangtze River Waterway, and our investigation including the whole breeding season) three years in a row, 2012-2014. Individuals of C. nasus were collected from locations, the length-frequency data was analyzed using FAO-ICLARM Stock Assessment Tools (FiSAT) software. Bhattacharya’s plot produced one group of C. nasus at modal length 25.00 ± 1.32 cm. Population parameters were estimated by using various models including Powell-Wetherall plot, ELEFAN I, growth performance index, mortality estimation and recruitment pattern. Overall, growth parameters, asymptotic length (L∞) = 40.95cm and growth coefficient (K) = 0.25 year-1. Growth performance index(Ø′) =2.62, total mortality (Z) = 1.58 year-1, natural mortality (M) = 0.54 year-1, fishing mortality (F) = 1.04 year-1 and exploitation rate (E) = 0.66year-1. The length at first capture at 50%, (Lc) was 22.84cm. The observation of the annual recruitment of C. nasuswas found to occur from March to July. The Y′/R analysis showed that Epresent > E0.5 , which exceeded the optimization (Eopt) criterion of 0.5 for sustainable exploitation of fisheries, so this species was over-exploited in Poyang Lake.

Keywords
Coilia nasus; growth; mortality; population dynamics; Poyang Lake
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