Abstract
Population parameters of Notopterus notopterus (Pallas, 1769) from length-frequency data collected from Kaptai Reservoir of Rangamati, Bangladesh from January, 2013 to December, 2013 were calculated by using FiSAT software. The asymptotic total length (L?) and growth coefficient (K) were estimated to be 34.91cm and 0.38 y?1respectively. The instantaneous rate of natural mortality (M), fishing mortality (F) and total mortality (Z) were estimated to be as 0.91 y?1, 0.28 y?1and 1.19 y?1 respectively. The value of exploitation rate (E) was found to be 0.24 which clearly pointed toward moderate or less fishing pressure (E<0.50) of N. notopterus in the Kaptai reservoir of Bangladesh. The recruitment of the species was found throughout the year with two peaks - one from March-April; and another from May- June. Virtual population analysis (VPA) estimated that the maximum numbers of N. notopterus were caught between 10.50 cm to 32.50 cm with maximum F value (0.80 y?1) in the mid length of 18.30 cm. During the year 2013 the total catch of N. notopterus was found to be 664.5 MT, which contributed about 7.78% of the total catch of Kaptai Lake. Relative yield per recruit (Y/R) and biomass per recruit (B/R) suggested that the natural mortality should be reduced to 0.91 y?1 by proper management to obtain a maximum sustainable exploitation rate (Emax= 0.828) for the species in the reservoir. DOI: http://dx.doi.org/10.3329/sja.v12i2.21923 SAARC J. Agri., 12(2): 112-122 (2014
Highlights
Notopterus notopterus (Pallas, 1769) is a member of the family Notopteridae, commonly known as grey featherback and bronze featherback but locally known as Foli and Pholoi in Bangladesh
The minimum and maximum total lengths of N. notopterus (Pallas, 1769) were varied between 10.00 cm and 33.25 cm with the estimated value of asymptotic length ( L ) 34.91cm which is higher than the value (33.8 cm) found by Kiran et al (2004) and Sani et al (2010); lower than the value (40 cm) found by Parameswaran and Sinha (1966)
Mortality (Total, Natural and Fishing) and Exploitation Rate The values of total mortality (Z), natural mortality (M) and fishing mortality (F) were 1.19 y−1, 0.91 y−1 and 0.28 y−1 respectively (Figure 2); of which natural mortality was dominated over the fishing mortality which indicate that low fishing pressure is prevailing for N. notopterus in the Kaptai reservoir
Summary
Notopterus notopterus (Pallas, 1769) is a member of the family Notopteridae, commonly known as grey featherback and bronze featherback but locally known as Foli and Pholoi in Bangladesh This species is locally important for its taste and abundance in the Kaptai reservoir. Effective management of any fishery requires considerable knowledge on population parameters such as length-weight relationship, age and growth, mortality, recruitment pattern and stock position of important species. Estimation of these parameters leads towards the better prediction on fish stock assessment from which fisheries managers can know about the present status of any fishery. The present research was aimed to determine the population parameters of N. notopterus using length-frequency based analysis collected from Kaptai reservoir of Rangamati, Chittagong, Bangladesh
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