Sains Malaysiana 44(1)(2015): 31–40

Biological Aspects of the Critically Endangered Fish, Labeo boga in the Ganges River, Northwestern Bangladesh

(Aspek Biologi Ikan Terancam Kritikal, Labeo boga di dalam Sungai Ganges, Barat Laut Bangladesh)

MD. YEAMIN HOSSAIN*, SHARMIN JAHAN, MD. ABU SAYED JEWEL, MD. MOSADDEQUR RAHMAN, MST. MONIRA KHATUN & SALEHA JASMINE

Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi 6205

Bangladesh

Diserahkan: 27 Februari 2013/Diterima: 14 Jun 2014

ABSTRACT

The present study reports the first complete and inclusive description of some biological parameters including length-frequency distribution (LFD), sex ratio (SR), length-weight relationship (LWR), condition factors (allometric, KA; Fulton’s, KF; relative, KR and relative weight, WR) and form factor (a3.0) of Labeo boga in the Ganges River, northwestern Bangladesh. Sampling was conducted using traditional fishing gears during April 2011 to March 2012. For each specimen, total length (TL) was measured to the nearest 0.01 cm using digital slide calipers and total body weight (BW) was measured using an electronic balance with 0.01 g accuracy. The LWR was calculated using the expression: W= a Lb, where W is the BW and L is the TL. A total of 211 specimens ranging from 9.78-27.50 cm TL and 10.00 to 276.10 g BW were studied. BW of females was significantly higher than that of males (Mann-Whitney U-test, p>0.001). However the overall sex ratio did not differ significantly from the expected value of 1:1 (χ2 = 0.12, p<0.05). The calculated b for the LWR indicated isometric growth (» 3.00) in males, females and combined gender and there were significant differences in the intercepts but not in the slopes between the sexes of  L. boga in the Ganges River. KF of females was significantly higher than that for males (p<0.001). In addition, the Wilcoxon signed rank test showed that the WR did not differ from 100 for males and females in this study indicating good condition of habitat for L. boga. The results of this study would be an effective tool for fishery specialists to initiate early management strategies and regulations for the sustainable management of the remaining stocks of this species within the Padma River and surrounding ecosystems.

Keywords: Condition; conservation; Ganges; Labeo boga; Length-weight relationship

ABSTRAK

Kajian ini melaporkan huraian lengkap dan terangkum pertama beberapa parameter biologi termasuk taburan panjang frekuensi (LFD), nisbah jantina (SR) hubungan panjang-berat (LWR), faktor keadaan (alometrik, KA; Fulton, KF; relatif, KR dan berat relatif, WR) serta faktor bentuk (a3.0) Labeo boga di dalam Ganges Sungai, Barat Laut Bangladesh. Pensampelan dijalankan menggunakan peralatan tradisi menangkap ikan sepanjang April 2011 hingga Mac 2012. Bagi setiap spesimen, jumlah panjang (TL) dikira ke 0.01 cm terdekat menggunakan slaid angkup digital dan berat keseluruhan badan (BW) diukur menggunakan penimbang elektronik dengan 0.01 g ketepatan. LWR dikira menggunakan ungkapan: W= a Lb, dengan W adalah BW dan L adalah TL. Sebanyak 211 spesimen antara 9.78-27.50 cm TL dan 10.00 ke 276.10 g BW telah dikaji. BW betina adalah lebih tinggi daripada jantan (U-ujian Mann-Whitney, p>0.001), walau bagaimanapun, nisbah jantina keseluruhan pula tidak berbeza secara signifikan daripada nilai dijangka 1:1 (χ2 = 0.12, p<0.05). Kiraan b untuk LWR menunjukkan pertumbuhan isometrik (» 3.00) pada jantan, betina dan gabungan jantina serta terdapat perbezaan signifikan dalam pintasan tersebut tetapi tidak di cerun antara jantina L. boga di dalam Sungai Ganges. KF betina adalah lebih tinggi daripada jantan (p<0.001). Disamping itu, pangkat uji bertanda Wilcoxon menunjukkan bahawa WR tidak berbeza daripada 100 untuk jantan dan betina dalam kajian ini dan menunjukkan keadaan yang baik untuk habitat L. boga. Keputusan kajian ini boleh menjadi alat yang berkesan untuk pakar perikanan memulakan strategi awal pengurusan dan peraturan bagi pengurusan yang mampan untuk stok spesies ini di dalam Sungai Padma dan ekosistem persekitaran.

Kata kunci: Ganges; keadaan; Labeo boga; hubungan panjang-berat; pemuliharaan

RUJUKAN

Anderson, R.O. & Neumann, R.M. 1996. Length, weight and associated structure indices. In: Fisheries Techniques. 2nd ed., edited by Murphy, B.R. & Willis, D.W. Bethesda, MD: American Fisheries Society. pp. 447-482.

Angelescu, V., Gneri, F.S. & Nani, A. 1958. La merluza del mar argentine (biologia e taxonomia). Secr. Mar. Serv. Hidrog. Nav. Publico, H1004. pp. 1-224.

Avşar, D. 1998. Fisheries biology and population dynamics. University of Çukurova, Faculty of Fisheries, Adana, Turkey, pp. 303 (in Turkish - unpublished).

Chandrashekhariah, H.N., Rahman, M.F. & Lakshmi Raghavan, S. 2000. Status of fish fauna in Karnataka. pp. 98-135. In Endemic Fish Diversity of Western Ghats, edited by Ponniah, A.G. & Gopalakrishnan A. NBFGR-NATP publication. National Bureau of Fish Genetic Resources, Lucknow, U.P., India. 1, p. 347.

Conover, D.O. & Kynard, B.O. 1981. Environmental sex determination: Interaction of temperature and genotype in a fish. Science 213: 577-579.

Dahanukar, N. 2010. Labeo boga. In IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist. org>. Accessed on 19 December 2012.

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

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

Gerritsen, H.D. & McGrath, D. 2007. Significant differences in the length-weight relationships of neighbouring stocks can result in biased biomass estimates: Examples of haddock (Melanogrammus aeglefi nus, L.) and whiting (Merlangius merlangus, L.). Fisheries Research 85: 106-111.

Hossain, M.Y., Rahman, M.M., Ahamed, F., Ahmed, Z.F. & Ohtomi, J. 2014. Length-weight and length-length relationships and form factor of three threatened fishes from the Ganges River (NW Bangladesh). Journal of Applied Ichthyology 30(1): 221-224.

Hossain, M.Y., Khatun, M.M., Jasmine, S., Rahman, M.M., Jewel, M.A.S. & Ohtomi, J. 2013a. Life-history traits of the threatened freshwater fish Cirrhinus reba (Hamilton 1822) (Cypriniformes: Cyprinidae) in the Ganges River, Northwestern Bangladesh. Sains Malaysiana 42(9): 1219- 1229.

Hossain, M.Y., Jewel, M.A.S., Rahman, M.M., Haque, A.B.M.M. & Ohtomi. J. 2013b. Life-history traits of the freshwater garfish Xenentodon cancila (Hamilton, 1822) (Belonidae) in the Ganges River, Northwestern Bangladesh. Sains Malaysiana 42(9): 1207-1218.

Hossain, M.Y., Rahman, M.M., Jewel, M.A.S., Hossain, M.A., Ahamed, F., Tumpa, A.S., Abdallah, E.M. & Ohtomi, J. 2013c. Life-history traits of the critically endangered catfish Eutropiichthys vacha (Hamilton, 1822) in the Jamuan (Brahmaputra River distributary) River, northern Bangladesh. Sains Malaysiana 42(3): 265-277.

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

Hossain, M.Y., Rahman, M.M., Jewel, M.A.S., Ahmed, Z.F., Ahamed, F., Fulanda, B. & Ohtomi, J. 2012b. Conditions-and form-factor of the five threatened fishes from the Jamuna (Brahmaputra River Distributary) River, northern Bangladesh. Sains Malaysiana 41(6): 671-678.

Hossain, M.Y., Ohtomi, J., Ahmed, J., Jasmine, S. & Vadas, R.L. 2012c. 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., Jewel, M.A.S., Nahar, L., Rahman, M.M., Naif, A. & Ohtomi, J. 2012d. Gonadosomatic index-based size at first sexual maturity of the catfish Eutropiichthys vacha (Hamilton, 1822) in the Ganges River (NW Bangladesh). Journal of Applied Ichthyology 28(4): 601-605.

Hossain, M.Y., Rahman, M.M. & Abdallah, E.M. 2012e. Relationships between body size, weight, condition and fecundity of the threatened fish Puntius ticto (Hamilton, 1822) in the Ganges River, northwestern Bangladesh. Sains Malaysiana 41(7): 803-814.

Hossain, M.Y., Rahman, M.M., Miranda, R., Leunda, P.M., Oscoz, J., Jewel, M.A.S., Naif, A. & Ohtomi, J. 2012f. Size at first sexual maturity, fecundity, length-weight and length-length relationships of Puntius sophore (Cyprinidae) in Bangladeshi waters. Journal of Applied Ichthyology 28(5): 818-822.

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

Hossain, M.Y., Ohtomi, J., Ahmed, Z.F., Jasmine, S. & Ibrahim, A.H.M. 2009b. Length-weight and morphometric relationships of the tank goby Glossogobius giuris (Perciformes: Gobiidae) in the Ganges of the northwestern Bangladesh. Asian Fisheries Science 22(3): 961-969.

Hossain, M.Y., Ahmed, Z.F., Leunda, P.M., Jasmine, S., Oscoz, J., Miranda, R. & Ohtomi, J. 2006. Condition, length-weight and length-length relationships of the Asian striped catfish Mystus vittatus (Bloch, 1794) (Siluriformes: Bagridae) in the Mathabhanga River, southwestern Bangladesh. Journal of Applied Ichthyology 22(4): 304-307.

IUCN Bangladesh. 2000. Red book of threatened fishes of Bangladesh. In The World Conservation Union, edited by Mahmud-ul-Ameen, Md. Anwarul Islam & Ainun Nishat. xi, p.116.

Jobling, M. 2008. Environmental factors and rates of development and growth. In Handbook of Fish Biology and Fisheries, Vol. 1: Fish Biology, edited by Hart, P.J. & Reynolds, J.D. Oxford: Blackwell Publishing Ltd. pp. 97-122.

King, M. 2007. Fisheries Biology, Assessment and Management. 2nd ed. Oxford: Blackwell Scientific Publications. pp. 1-381.

Koutrakis, Ε.Τ. & Tsikliras, Α.C. 2003. Length-weight relationships of fishes from three northern Aegean estuarine systems (Greece). Journal of Applied Ichthyology 19(4): 258-260.

Le Cren, E.D. 1951. The length-weight relationship and seasonal cycle in gonad weight and condition in the perch (Perca fluviatilis). Journal of Animal Ecology 20: 201-219.

Menon, A.G.K. 1999. Check list - fresh water fishes of India. Rec. Zool. Surv. India, Misc. Publ., Occas. Pap. No. 175. pp. 366.

Parvin, M.R., Al-Misned, F.A. & Mortuza, M.G. 2011. The fecundity and sex ratio of Labeo boga (Hamilton) (Cypriniformes: Cyprinidae) of Rajshahi, Bangladesh. Continental Journal of Fisheries and Aquatic Science 5(3): 19-21.

Pervin, M.R. & Mortuza, M.G. 2008. Length-weight relationship and condition factor of fresh water fish, Labeo boga (Hamilton) (Cypriniformes: Cyprinidae). University Journal of Zoology, Rajshahi University 27: 97-98.

Rahman, A.K.A. 2005. Freshwater Fishes of Bangladesh. 2nd ed. Zoological Society of Bangladesh, Department of Zoology, University of Dhaka, Dhaka-1000, pp. 1-263.

Rahman, M.M., Hossain, M.Y., Hossain, M.A., Ahamed, F. & Ohtomi, J. 2012a. Sex ratio, length-frequency distributions and morphometric relationships of length-length and length-weight for Spiny eel, Macrognathus aculeatus in the Ganges River, NW Bangladesh. World Journal of Zoology 7(4): 338-347.

Rahman, M.M., Hossain, M.Y., Jewel, M.A.S., Rahman, M.M., Jasmine, S., Abdallah, E.M. & Ohtomi, J. 2012b. Population structure, length-weight and length-length relationships and condition and form-factor of the pool barb Puntius sophore (Hamilton, 1822) (Cyprinidae) from the Chalan Beel, north-central Bangladesh. Sains Malaysiana 41(7): 795-802.

Ricker, W.E. 1973. Linear regression in fisheries research. Journal of Fisheries Research Board of Canada 30: 409-434.

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

Schultz, H. 1996. Drastic decline of the proportion of males in the roach (Rutilus rutilus L.) of Bautzen Reservoir (Saxony, Germany): Result of direct and indirect effects of biomanipulation. Limmologica 26: 153-164.

Sokal, R.R. & Rohlf, F.J. 1987. Introduction to Biostatistics. 2nd ed. New York: Freeman Publication.

Tesch, F.W. 1971. Age and growth. In Methods for Assessment of Fish Production in Fresh Waters. Ricker, W.E. Oxford: Blackwell Scientific Publications. pp. 99-130.

Tesch, F.W. 1968. Age and growth. In Methods for Assessment of Fish Production in Fresh Waters, edited by Ricker, W.E. Oxford: Blackwell Scientific Publications. pp. 93-123.

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