Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/34624
Title: Estimation of growth, mortality and exploitation of lesser tiger toothed croaker Otolithes cuvieri (Trewavas. 1974) in Pakistan
Authors: Memon, Khadim Hussain
Liu, Qun
Kalhoro, Muhsan Ali
Chang, Mohammad Saleem
Mirjat, Abul Nabi
Keywords: Otolithes cuvieri;Growth;Mortality;Biological reference points;Pakistan
Issue Date: Jan-2015
Publisher: NISCAIR-CSIR, India
Abstract: Four demersal trawl surveys were carried out in Pakistani marine waters in 2009-2010.  Length frequency data of 3219 individuals were used to estimate growth, mortality and exploitation, whereas data of 671 individuals were used to estimate length weight relationship in Otolithes cuvieri (Trewavas, 1974).  Length ranges from 3 - 35cm and weight ranges from 1 - 208g.  Length weight relationship parameters were computed as a = 0.014, b = 2.870 and R2 = 0.952. Using the ELEFAN routine of the FiSAT computer package, the calculated von Bertalanffy growth function parameters were L= 36.75cm, K= 0.300/year. Total mortality were computed using length-converted catch curve analysis at Z=1.26/year, whereas natural M=0.740/year and fishing mortality F=Z-M= 0.52/year were calculated. The exploitation ratios (E) were computed as Emax = 0.412, E10 = 0.355, E50 = 0.278. The yield per recruit analysis showed that when tc was 1, Fmax was calculated at 0.5 and F0.1 at 0.4. When biological reference point of Fopt was `M (0.740), current fishing mortality rate of 0.52 is smaller than the target biological reference point.
Page(s): 63-68
URI: http://hdl.handle.net/123456789/34624
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.44(01) [January 2015]

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