Length–Weight Relationships and Condition Factor of Snow Trout, Schizothorax richardsonii (Gray, 1832) From Different Rivers of the Himalayan Region in India

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  Length–Weight Relationships and Condition Factor of Snow Trout, Schizothorax richardsonii (Gray, 1832) From Different Rivers of the Himalayan Region in India
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  Technical contributionLength  –  weight and length  –  length relationships of the vulnerable dark mahseer Puntius chelynoides  (McClelland, 1839) from Garhwal Himalaya, India By J. I. Mir 1 , O. Gusain 2 , M. P. Gusain 2 , F. A. Mir 3 , U. K. Sarkar 1 and A. Pandey 1 1 National Bureau of Fish Genetic Resources, Lucknow, India;  2 Department of Zoology and Biotechnology, Hemwati NandanBahuguna Garhwal University, Srinagar Garhwal, India;  3 P. G. Department of Zoology, University of Kashmir, Srinagar, India Summary The present study describes the length  –  weight (LWR) andlength  –  length relationships (LLR) of   Puntius chelynoides (McClelland, 1839), commonly known as the dark mahseer,a coldwater fish species which inhabits fast-flowing hill-streams of India and Nepal. A total of 422 specimens werecollected between January and June 2010 from a spring-fedstream in Garhwal Himalaya, India. No information regard-ing LWRs, LLRs or K of this species was available inFishBase. Introduction The dark mahseer,  Puntius chelynoides,  is a commerciallyimportant freshwater fish of India, native to coldwaterstreams of Garhwal Himalaya. The male attains a maximumtotal length of 66 cm (Menon, 1999). This species is listed asvulnerable (VU) in the IUCN critically endangered categoryin IUCN (2012). Menon (1999) noted that this species wasearlier known from Assam. Menon (2004) suggests that thisspecies is probably extinct in Assam and thus is nowconfined to the headwaters of the Ganges. According toRanjan et al. (2007),  P. chelynoides  is found only inupstream but not in downstream regions. Materials and methods Measurement of length and weight of 422 specimens of  P. chelynoides  from Bachchan Gad (30 ° 15 ′ N; 78 ° 55 ′ E), aspring-fed stream on the Alaknanda River (tributary of Ganges basin) India, were collected from January to June2010. Total length (TL) and fork length (FL) to the nearest0.1 cm and body weight (BW) to the nearest 0.1 g wererecorded for each individual. Identification of fishes wasdone following Day (1878) and Talwar and Jhingran (1991).Monthly LWRs were determined by the linear regressionequation: log  W   =  log  a  +  b  log TL, where  W   is the weightof the fish (g), TL is the total length (cm),  a  is the interceptand  b  the slope of the regression curve (Ruiz-Campos et al.,2010). Length  –  length relationships, i.e. TL  –  FL werecalculated by linear regression (Hossain, 2010). Results and discussion Length  –  weight relationship statistics for  P. chelynoides  arepresented in Table 1. The linear regressions were highlysignificant (P  <  0.001), with the coefficient of determination( r 2 ) values being  > 0.97. The length  –  length relationship wasdescribed by the equation, Log TL  =  2.086 Log FL  1.170(n  =  422;  r 2 =  0.965). FishBase had no LWRs or LLRrecords for  P. chelynoides  as of March 2013 (Froese andPauly, 2011). The values of   b  for this species however, werewithin the normal range of 2.5  –  3.5, as suggested by Froese(2006).In conclusion this study has provided first basic informa-tion on the LWR and LLR of   P. chelynoides  that would beuseful for fishery biologists/managers. Acknowledgements We wish to acknowledge the fishermen for their cooperationin collecting specimens. We would also like to express our Table 1Monthly descriptive statistics and estimated length  –  weight relationship parameters of   Puntius chelynoides  in a spring-fed stream, GarhwalHimalaya (India), January to June 2010Months NTotal length (cm) Total body weight (g)Regressionparameters95% Cl of   a  95% Cl of   b  r 2 Minimum Maximum Minimum Maximum  a *  b    SEJanuary 77 10.0 37.5 18.5 800.6 0.0046 2.75    0.03 0.0042  –  0.0049 2.69  –  2.86 0.99February 72 9.5 38.5 15.7 910.4 0.0118 2.86    0.01 0.0089  –  0.0136 2.84  –  2.86 0.98March 67 7.5 32.5 15.3 730.5 0.0166 2.89    0.01 0.0098  –  0.0173 2.86  –  2.91 0.99April 73 6.5 41.0 12.2 950.6 0.0155 2.94    0.04 0.0138  –  0.0175 2.92  –  2.96 0.99May 68 6.0 38.5 13.8 810.5 0.0111 2.88    0.01 0.0100  –  0.0115 2.84  –  2.92 0.98June 65 5.8 36.8 10.8 670.3 0.0056 2.60    0.02 0.0038  –  0.0069 2.56  –  2.68 0.98N, total number of samples;  a , intercept;  b , slope; CL, Confidence limits; r 2 , Coefficient of determination.*Anti-log  a .J. Appl. Ichthyol. (2013), 1–2 ©  2013 Blackwell Verlag GmbHISSN 0175–8659 Received: September 25, 2012Accepted: April 15, 2013 doi: 10.1111/jai.12252 Applied Ichthyology  Journal of   gratitude to Dr. Froese and Prof. Rosenthal (Editor-in-Chief,J. Appl. Ichthyology.) for bringing forth such informativepublications, especially that of Dr. Froese (2006). And lastly,thanks are also due to former HOD (Prof. J. P. Bhatt),Department of Zoology and Biotechnology, HNB GarhwalUniversity Srinagar Garhwal, for providing the necessaryfacilities to carry out this work. References Day, F., 1878: The fishes of India; being a natural history of the fishesknown to inhabit the seas and fresh waters of India, Burma andCeylon, Vol. 1. Bernard Qualitch, London, pp. 529  –  533.Froese, R., 2006: Cube law, condition factor and weight length rela-tionship: history, meta-analysis and recommendations. J. Appl.Ichthyol.  22 , 241  –  253.Froese, R.; Pauly, D. (Eds), 2011: FishBase. World Wide Web elec-tronic publication. Available at: http://www.fishbase.org,Version3 (accessed on 20 March 2012).Hossain, M. Y., 2010: Length-weight, length-length relationships andcondition factors of three schibid catfishes from the PadmaRiver, northwestern Bangladesh. Asian Fish. Sci.  23 , 329  –  339.IUCN, 2012: IUCN Red List of Threatened Species. Version 2012.1Downloaded in June 2012.Menon, A. G. K., 1999: Checklist  –   Freshwater Fishes of India.Rec. Zool. Surv. India, Misc. Publ., Occas. Pap. No. 175, pp.366.Menon, A. G. K., 2004: Threatened fishes of India and their conser-vation. Zoological Survey of India, Kolkata, India.Ranjan, J. B.; Herwig, W.; Subodh, S.; Michael, S., 2007: Fish basestudy of the impacts of dams in different rivers of Nepal and itsseasonal variations. Int. J. Phys. Sci.  19 , 27  –  44.Ruiz-Campos, G.; Ramirez-Valdez, A.; Gonzalez-Guzman, S.; Gonz-alez-Acosta, A. F.; Acosta Zamorano, D., 2010: Length-weightand length-length relationships for nine rocky tidal pool fishesalong the Pacific coast of the Baja California Peninsula, Mexico.J. Appl. Ichthyol.  26 , 118  –  119.Talwar, P. K.; Jhingran, A. G., 1991: Inland fishes of India andadjacent countries. Oxford and IBH Publishing Co, NewDelhi. Author’s address:  Omprakash Gusain, D  epartement of Zoology andBiotechnology, Hemwati Nandan Bahuguna Garh-wal University, Srinagar Garhwal-246174, Uttark-hand, India.E-mails: sxr786@gmail.com; ogusain@yahoo.com2 J. I. Mir et al.
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