Length-weight relationship and condition factor for cyprinid fish species found in lower Zhob river, northern Balochistan, Pakistan

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Research Paper 01/04/2020
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Length-weight relationship and condition factor for cyprinid fish species found in lower Zhob river, northern Balochistan, Pakistan

Nadia Naseeb, Asmatullah Kakar, Wali Mohammad, Mahrukh Naseem, Zafarullah, Farah Naz
Int. J. Biosci.16( 4), 277-289, April 2020.
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This research study was conducted with the aim to evaluate the length-weight relationship (LWR) parameters and condition factor (K) for three native fish species, namely, Labeo rohita, Cyprinion watsoni and Garra gotyla . A total of 756 specimens including 251 L. rohita, 255 C. watsoni, and 250 G. gotyla were caught by scoop net in the months of February, March, and September, October 2019 from the lower Zhob River, in northern Balochistan. The estimated total length and total weight for these specimens were ranged from 7 to 18.9 cm and 5 to 79 g; 6.8 to 18.9 cm and 2 to 73 g; 7.5 to 17.6 cm and 5 to 68 g respectively. Based on the results, the values of b varied between 1.25 for Garra gotyla, to 3.19 for Cyprinion watsoni. All length-weight relationships were significant (P<0.001), with r greater than 0.97. The condition factor (K value) were found to be between 0.035±0.034 for G. gotyla to 0.33±.0.11 for C. watsoni, whereas the r2 values ranged from 0.976 (L. rohita) to 0.955 (G. gotyla). r 2 >0.98 indicated highly significant correlation between length-weight, total length, and standard length for the three fish species. All linear regressions were highly significant (P<0.05).The overall value of the exponent of LWR (b = 1.25) suggested negative allometric growth. Furthermore, the first reference for separate male, female and combined (mixed) sex of length-weight relationships for L. rohita, C. watsoni, G. gotyla were furnished. The results of the present study will contribute to the proper management, growth of collected fish species and might be used to fill a space in the current knowledge in this area.


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