NDLI: Population dynamics of Japanese threadfin bream Nemipterus japonicus from Pakistani waters

Content Provider	Springer Nature Link
Author	Kalhoro, Muhsan Ali Liu, Qun Memon, Khadim Hussain Chang, Mohammad Saleem Zhang, Kui
Copyright Year	2014
Abstract	Japanese threadfin bream Nemipterus japonicus (Bloch, 1791) is among the most abundant and commercially important species in Pakistan. From the coast of Pakistan, four demersal trawl surveys in October–November 2009 and May–June, August, October and November in 2010 were carried out. The purpose of this study is to estimate the population dynamics and status of the stock of the N. japonicus from Pakistani waters based on the research trawl surveys from the research area. The data consist of n=784 length-weight pairs and n=7 530 length frequency with the maximum length and weight of 29 cm and 358 g respectively. The length frequency data were analyzed using ELEFAN method in FiSAT computer package. The parameters of length and weight relationship were b=2.778, a=0.032 and R $^{2}$=0.973. The estimated von Bertalanffy growth function parameters were L $_{∞}$=30.45 cm, K=0.270 year$^{−1}$. Based on length-converted catch curve analysis the total mortality (Z) during this study was estimated at 0.960 year$^{−1}$. The natural mortality coefficient (M) was 0.74 year$^{−1}$ using Pauly’s equation (the annual average sea surface temperature was 27°C), therefore, the fishing mortality coefficients (F) were 0.22 year$^{−1}$. The yield per recruit analysis indicated that when t $_{c}$ was 2, F $_{max}$ was estimated at 1.2 and F $_{0.1}$ at 1.1. When t $_{c}$ was 1, F $_{max}$ was estimated at 0.95 and F $_{0.1}$ at 0.8. Because current age at first capture is about 1 year and F $_{current}$ was 0.22, F $_{current}$ is smaller than F $_{0.1}$ and F $_{max}$, which indicated that the fishery is about in a safe condition. When using Gulland (1971) biological reference point, F $_{opt}$ was equals to M (0.74). The current fishing mortality rate of 0.22 was smaller than the target biological reference point.
Starting Page	49
Ending Page	57
Page Count	9
File Format	PDF
ISSN	0253505X
Journal	Acta Oceanologica Sinica
Volume Number	33
Issue Number	10
e-ISSN	18691099
Language	English
Publisher	The Chinese Society of Oceanography
Publisher Date	2014-10-03
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pakistan Nemipterus japonicus length-weight relationship growth mortality Oceanography Climatology Ecology Engineering Fluid Dynamics Marine & Freshwater Sciences Environmental Chemistry
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Oceanography

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