International Journal of Marine Science 2015, Vol.5, No.56: 1-5
1
A Letter Open Access
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)
Corresponding author email
International Journal of Marine Science, 2015, Vol.5, No.56 doi
Received: 29 Jul, 2015
Accepted: 28 Aug, 2015
Published: 28 Sep., 2015
Copyright
©
2015 Bin.,et al This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted
use, distribution, and reproduction in any medium, provided the original work is properly cited.
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
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 > E
0.5
, 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
1 Introduction
Coilia nasus
, also called Japanese grenadier anchovy,
are widely distributed in the northwest Pacific, including
the Yellow Sea and East Sea as well as penetrating
over 1400 km (middle reaches) up the Yangtze River.
Matured fish make productive migration in succession
from near ocean to river when reproductive season
comes. Guo et al. (2014) found the rise of water
temperature off Yangtze River Estuary may be an
important environmental factor, which can induce
C.
nasus
to start migration
．
They also found the peak
fishing period usually started from late March to
middle April with the high yield in each year based on
the catch analysis. The junction of the Poyang Lake
with the Yangtze River was at Hukou. Poyang Lake is
China's largest seasonal fresh water lake, is rich in
fishing resources. But the shallow depth of the lake,
the short water cycle, and water area of high water
period, low water period, normal water period is large
differences, causing this system stability and anti-
amming capability poor, fish resource security risk.
With increasing commercial demand for its delicacy,
C. nasus
has become an important fishery resource of
Poyang Lake in recent years. Especially in the
background of actively promote the Poyang Lake
water conservancy project construction, high perfor-
mance scientific assessment of fish resources will
provide strong support for the ecological environment
protection in Poyang Lake.
Through the consult literature and identify, to 2014,
the accumulated number of 134 fish species was recorded
in Poyang lake, belonging to 26 families, 12 orders.
The largest of families was the Cyprinidae (71
species), contributing 53.0% to the total. The mainly
fish in Poyang lake showed a trend of low age
miniaturization, and low-quality, one-year old fishes.
According to the main fishery resources exploitation
