Sains Malaysiana 45(6)(2016): 899–907

Fecundity of the Threatened Fish, Mystus vittatus (Siluriformes: Bagridae) in the Padma River, Bangladesh

(Kesuburan Ikan Terancam, Mystus vittatus (Siluriformes: Bagridae) di Sungai Padma, Bangladesh)

MD. MOSADDEQUR RAHMAN¹*, MD. YEAMIN HOSSAIN², SOHANA PARVIN², MST. SADIA RAHMAN², ZOARDER FARUQUE AHMED³, JUN OHTOMI¹ & ELSAYED FATHI ABD ALLAH⁴

¹Faculty of Fisheries, Kagoshima University, 4-50-20 Shimoarata, Kagoshima 890-0056, Japan

²Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi, Bangladesh

³Department of Fisheries Management, Faculty of Fisheries, Bangladesh Agricultural University

Mymensingh 2202, Bangladesh

⁴Plant Production Department, College of Food and Agricultural Sciences, King Saud University

P.O. Box. 2460 Riyadh 11451, Saudi Arabia

Received: 10 March 2015/Accepted: 20 January 2016

ABSTRACT

The threatened indigenous small fish, Mystus vittatus (Bloch 1794) is a commercially important fish of Bangladesh. The present study describes the fecundity and its relationships with some of the morphometrics and condition factors (Fulton's, KF; Relative weight, WR) of M. vittatus. A total of 50 matured female M. vittatus were collected using the cast net from the Padma River during May-July, 2012. Total fecundity (FT) of each female was calculated as the number of oocytes found in each ovary, whereas relative fecundity (FR) was the number of oocytes per gram of fish weight. The total length (TL) ranged from 8.21 to 12.36 cm (10.60±1.08 cm) and the body weight (BW) varied between 6.0 and 21.65 g (14.08±4.15 g). The FT ranged from 3256 to 22549 with a mean value of 13064.50±4920 while the FR ranged from 472 to 1648 oocytes per gram of female, with a mean of 929±245. Significant and strong relationships were found between FT vs. TL (r2 = 0.63; p<0.001), FT vs. BW (r2 = 0.61; p<0.001), FT vs. OW (r2 = 0.89; p<0.001) and FT vs. GSI (rs = 0.67; p<0.001), but insignificant relationships were recorded for FT vs. KF (rs = 0.11; p = 0.452), FT vs.WR (rs = 0.001; p = 0.997). The information provided in this study will help initiating sustainable management and conservation of the threatened M. vittatus in the region.

Keywords: Bangladesh; condition factor; fecundity; Mystus vittatus; Padma River; threatened

ABSTRAK

Ikan kecil asli terancam Mystus vittatus (Bloch 1794) merupakan ikan komersial yang penting di Bangladesh. Kajian ini menerangkan kesuburan dan hubungannya dengan beberapa morfometrik dan faktor keadaan (Fulton, KF; Berat relatif, WR) M. vittatus. Sebanyak 50 ikan betina matang M. vittatus dikumpulkan dengan menggunakan jala dari Sungai Padma pada bulan Mei-Julai 2012. Jumlah kesuburan (FT) setiap ikan betina dikira berdasarkan bilangan oosit yang dijumpai di dalam setiap ovari, manakala kesuburan relatif (FR) adalah bilangan oosit setiap gram berat ikan. Panjang keseluruhan (TL) adalah antara 8.21 ke 12.36 cm (10.60 ± 1.08 cm) dan berat badan (BW) berbeza antara 6.0 dan 21.65 g (14.08 ± 4.15 g). Nilai FT adalah antara 3256-22549 dengan nilai min 13064.50±4920 manakala FR antara 472-1648 oosit setiap gram betina, dengan min 929±245. Hubungan yang signifikan dan kuat boleh dilihat antara FT vs. TL (r2 = 0.63; p<0.001), FT vs. BW (r2 = 0.61; p<0.001), FT vs. OW (r2 = 0.89; p<0.001) dan FT vs. GSI (rs = 0.67; p<0.001) tetapi hubungan yang tidak ketara dicatatkan bagi FT vs. KF (rs = 0.11; p = 0.452), FT vs. WR (rs = 0.001; p = 0.997). Maklumat yang diperoleh dalam kajian ini akan membantu menggalakkan pengurusan dan pemuliharaan M. Vittatus terancam di rantau ini.

Kata kunci: Bangladesh; faktor keadaan; kesuburan; Mystus vittatus; Sungai Padma; terancam

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*Corresponding author; email: mosaddeq.bd@gmail.com