Length-weight and length-length relationships, sex ratio and condition factors of the Asian striped dwarf catfish Mystus tengara (Hamilton, 1822) (Siluriformes: Bagridae) in the Ganges River, Northwestern Bangladesh

Nahida Rahman Mitu, Mohammad Manjurul ALAM, Mohammad Afzal HUSSAIN, Mohammad Rubait HASAN, Atul Chandra SINGHA


The present study describes the sex ratio (SR), distribution of length-frequency (DLF), relationship of length-weight (RLW), relationship of length-length (RLL) and condition factors of Mystus tengara, a small indigenous freshwater fish species. A total of 881 specimens ranging from 4.3-11.4 cm LT (total length) and 3.8-9.6 g WB (body weight) were investigated in the Ganges River of Rajshahi, northwestern Bangladesh from January 2010 to December 2010. The overall sex ratio showed significant differences from the expected value of 1:1 (df=1, χ2=8.9, P<0.001). The significant difference was found in the DLF (LT) between the sexes (Two tailed, P<0.001). Overall, the allometric coefficient b of the RLW was closed to the isometric value (b=3.088), although it suggested negative allometric growth for males (b=2.956) whilst positive allometric growth for females (b=3.198). The results further indicated that the RLL were highly correlated (r2>0.91, distribution of length-frequency). The value of Fulton’s condition factor (KF) was ranged from 0.9 to 1.2 for male and 1.0 to 1.5 for female M. tengara. Also, relative weight (WR) was significantly higher in females (WR>100) than in males (WR<100) indicating imbalance habitat with food availability.


Biology, Morphology, Sex ratio, Length-frequency, Length-weight.

Full Text:



Bhatt, V.S. 1971. Studies on the biology of some freshwater fishes. Part V. Mystus vittatus (Bloch). Journal of the Bombay Natural History Society 68(3): 556-572.

Bhuiyan, A.L. 1964. Fishes of Dacca. Asiatic Society of Pakistan. Publication 1, No.13, Dacca. 60-61.

Bobori, D.C.; Moutopoulos, D. K.; Bekri, M.; Salvarina, I. & Munoz, A.I.P. 2010. Length-weight relationships of freshwater fish species caught in three Greek lakes. Journal of Biological Research-Thessaloniki 14: 219-224.

Carlander, K.D. 1969. Handbook of Freshwater Fishery Biology. Vol.1. Ames, IA: The Iowa State University Press, USA.

Cooper, A. 1983. The reproductive biology of poor-cod, Trisopterus minutus L., whiting, Merlangius merlangus L., and Norway pout, Trisopterus esmarkii Nilsson, of the west coast of Scotland. Journal of Fish Biology 22: 317-334.

Froese, R. 2006. Cube law, condition factor and weight-length relationships: History, meta-analysis and recommendations. Journal of Applied Ichthyology 22: 241-253.

Froese, R. & Pauly, D. 2017. FishBase. World Wide Web electronic publication. Retrieved from http://www.fishbase.org (accessed on 1 August 2017).

Fulton, T.W. 1904. The rate of growth of fishes. Twenty-second Annual Report, Part III. Fisheries Board of Scotland, Edinburgh. 141-241 pp.

Gay, S.C. & Brown L.M. 2007. Analysis and Interpretation of Freshwater Fisheries Data. American Fisheries Society in Bethesda. 961 p.

Gupta, S. & Banerjee S. 2015. Length-weight relationship of Mystus tengara (Ham.-Buch., 1822), a freshwater catfish of West Bengal, India. International Journal of Aquatic Biology 3(2): 114-118.

Hamilton, F. 1822. An Account of the Fishes in River Ganges and its Branches. Archibald Constable and Company and Hurst, Robinson and Company, Edinburg and London.

Hossain, M.Y.; Jasmine, S.; Ibrahim, A.H.M.; Ahmed, Z.F.; Rahman, M.M. & Ohtomi, J. 2009a. Length-weight and relationship of length-length of 10 small fish species from the Ganges, Bangladesh. Journal of Applied Ichthyology 25: 117-119.

Hossain, M.Y.; Ohtomi, J. & Ahmed Z.F. 2009b. Morphometric, meristic characteristics and conservation of the threatened fish, Puntius sarana (Hamilton, 1822) (Cyprinidae) in the Ganges River, northwestern Bangladesh. Turkish Journal of Fisheries & Aquatic Sciences 9(2): 223-225.

Hossain, M.Y. 2010. Length-weight, relationship of length-length and condition factors of three schilbid catfishes from the Padma River, Northwestern Bangladesh. Asian Fisheries Society 23: 329-339.

Hossain, M.Y.; Ohtomi, J.; Ahmed, J.; Jasmine, S. & Vadas, R.L. 2012a. Life-history traits of the Monsoon River prawn Macrobrachium malcolmsonii (Milne-Edwards, 1844) (Palaemonidae) in the Ganges (Padma) River, northwestern Bangladesh. Journal of Freshwater Ecology 27(1): 131-142.

Hossain, M.Y.; Rahman, M.M.; Fulanda, B.; Jewel, M.A.S.; Ahamed F. & Ohtomi, J. 2012b. Length-weight and relationship of length-length of the five threatened fishes from the Jamuna (Brahmaputra River distributary) River, northern Bangladesh. Journal of Applied Ichthyology 28(2): 275-277.

IUCN Bangladesh. 2000. Red book of threatened fishes of Bangladesh. IUCN-The world conservation union. 116 p.

Kalita, P.; Borgohainand, D. & Deka, P. 2017. Estimation of Length-weight relationship with relative condition factor of Mystus tengara (Hamilton, 1822) of Lechia-Pavomari beel (wetland) of Dhemaji District of Assam, India. International Journal of Fauna & Biological Studies 4(3): 85-88.

Martínez, P.; Viñas, A.M.; Sánchez, L.; Díaz, N.; Ribas, L. & Piferrer, F. 2014. Genetic architecture of sex determination in fish: applications to sex ratio control in aquaculture. Frontiers in Genetics 5: 340.

Mitu, N.R. & Alam, M.M. 2016. Feeding ecology of a bagrid catfish Mystus tengara (Hamilton, 1822) in the Tanore wetland of Rajshahi, northwestern Bangladesh. Journal of Applied Ichthyology 32: 448-455.

Mitu, N.R. 2017. Reproductive biology of the female Asian striped dwarf catfish Mystus Tengara (Hamilton, 1822) (Siluriformes: Bagridae) in the Ganges River of Rajshahi, Northwestern Bangladesh. Turkish Journal of Fisheries & Aquatic Sciences 17: 589-598

Moutopoulos, D.K. & Stergiou, K.I. 2002. Length–weight and length–length relationships of fish species from the Aegean Sea (Greece). Journal of Applied Ichthyology 18: 200-203.

Musa, A.S.M. & Bhuiyan, A.S. 2007. Fecundity of Mystus bleekeri (Day, 1877) from the River Padma near Rajshahi city. Turkish Journal of Fisheries and Aquatic Sciences 7: 161-162.

Pauly, D. 1984. Fish population dynamics in tropical waters: a manual for use with programmable calculator. ICLARM Studies and Reviews, Manila, Philippines. 8: 325.

Pitcher, T.J. & Hart, P.J. 1982. Fisheries Ecology. Chapman & Hall, London.

Rao, T.A. & Sharma S.V. 1984. Reproductive biology of Mystus vittatus (Bloch) (Bagridae: Siluriformes) from Guntur, Andhra Pradesh. Hydrobiologia 119: 21-26.

Richter, T.J. 2007. Development and evaluation of standard weight equations for bridgelip sucker and large scale suckers. North American Journal of Fish Management 27: 936-939.

Roy, P.K. & Hossain, M.A. 2006. The fecundity and sex ratio of Mystus cavasius (Hamilton) (Cypriniformes: Bagridae). Journal of Life & Earth Sciences 1(2): 65-66.

Rypel, A.L. & Richter, T.J. 2008. Empirical percentile standard weight equation for the blacktail redhorse. North American Journal of Fish Management 28: 1843-1846.

Zamani Faradonbeh, M.; Eagderi, S. & Ghojoghi F. 2015. Length-weight relationship and condition factor of seven fish species of Totkabon River (southern Caspian Sea basin), Guilan, Iran. International Journal of Aquatic Biology 3(3): 172-176.


  • There are currently no refbacks.