Sains Malaysiana 41(7)(2012): 803–814

 

Relationships between Body Size, Weight, Condition and Fecundity of the Threatened Fish Puntius ticto (Hamilton, 1822) in the Ganges River,Northwestern Bangladesh

(Hubungan antara Saiz Badan, Berat, Keadaan dan Tahap Kesuburan Spesies Ikan TerancamPuntius Ticto (Hamilton, 1822) di Sungai Gangga, Barat Laut Bangladesh)

 

Md. Yeamin Hossain*

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

 

Md. Mosaddequr Rahman

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

 

Elgorban M. Abdallah

Center of Excellence of Biotechnology Research, King Saud University, Riyadh 11451

Saudi Arabia

 

Diserahkan: 18 Oktober 2011 / Diterima: 22 Disember 2011

 

 

ABSTRACT

 

The ticto barb Puntius ticto (Hamilton 1822) is a small, indigenous fish species of Bangladesh that is widely distributed in the natural waters of Asian countries. This study describes the relationships between body size, weight, condition (Fulton’s, KF; allometric, KA, KR; and relative weight, WR) and fecundity of the threatened species P. ticto from the Ganges River, northwestern Bangladesh. A total of 24 mature female specimens were collected by the traditional fishing gears from March to August 2006. For each individual, total (TL), fork (FL), standard length (SL), and ovary length (OL) were measured by digital slide calipers, while body (BW) and ovary weight (OW) were taken by a digital balance. Total fecundity (FT) of each female was calculated as the number of eggs found in each ovary, whereas relative fecundity (FR) was the number of eggs per gram of fish weight. The results showed that TL of P. ticto varied from 9.10 to 10.80 cm, with calculated mean ± SD as 9.77±0.57 cm. Body weights extended from 14.00 to 24.00 g, with calculated mean ± SD as 17.83±3.39 g. The mean FT was 2586±700 and ranged from 1611 to 4130. BW was more significantly correlated with total fecundity (r2>0.633; p<0.001) than various other body metrics. The results also indicated significant correlation between length-weight (df=22, t-test≥8.86, p<0.001); FT -KF (rs=0.473; p=0.019), FT-KA (rs=0.502; p=0.012), and FT-WR (rs=0.483; p=0.016), but insignificant correlations were found between FT-GSI (rs=0.309; p=0.141) and FR-with various other body metrics. The knowledge of fecundity would be useful to impose adequate regulations for the conservation of this threatened species in the Ganges River and nearby areas of Bangladesh.

 

Keywords: Bangladesh; fecundity; Ganges River; Puntius ticto

 

ABSTRAK

 

Puntius ticto (Hamilton 1822) merupakan ticto berduri bersaiz kecil yang merupakan spesies ikan berasal dari Bangladesh yang banyak dijumpai di perairan semula jadi negara Asia. Kajian ini menerangkan hubungkait di antara saiz badan, berat, keadaan (Fulton, KF; alometrik, KA dan berat relatif, WR) dan tahap kesuburan spesies ikan terancam P. tincto yang didapati di Sungai Gangga, barat laut Bangladesh. Sebanyak 24 spesimen ikan betina matang diperoleh secara penangkapan tradisional yang dilakukan di antara bulan Mac dan Ogos 2006. Pengukuran jumlah panjang (TL), cabangan (FL), panjang piawai (SL) dan panjang ovari ditentukan menggunakan kaliper gelangsar digital, manakala berat badan (BW) dan berat ovari (OW) diukur menggunakan penimbang digital. Jumlah kesuburan (FT) setiap ekor ikan betina dikira sebagai bilangan telur yang dijumpai di dalam setiap ovari, manakala kesuburan relatif (FR) adalah bersamaan dengan bilangan telur per gram berat ikan. Keputusan menunjukkan TL P.ticto berada di dalam julat 9.10 hingga 10.80 cm dan nilai purata ± SD adalah 9.77±0.57 cm. Julat berat badan adalah 14.00 hingga 24.00 g dengan nilai purata ± SD bersamaan 17.83±3.39 g. Purata FT adalah 2586±700 dengan julat 1611 hingga 4130. BW didapati mempunyai korelasi yang signifikan dengan jumlah kesuburan (r2>0.633; p<0.001) berbanding metrik badan yang lain. Keputusan juga menunjukkan korelasi yang signifikan di antara panjang-berat (df=22, ujian-t≥8.86, p<0.001); FT -KF (rs=0.473; p=0.019), FT-KA (rs=0.502; p=0.012), dan FT-WR (rs=0.483; p=0.016), tetapi hubungan di antara FT-GSI (rs=0.309; p=0.141) dan FR dengan metrik badan yang lain tidak menunjukkan korelasi yang signifikan. Pengetahuan tentang pembiakan adalah berguna untuk mengenakan peraturan bagi tujuan pemuliharaan spesies ikan yang terancam di Sungai Gangga dan kawasan sekitarnya di Bangladesh.

 

Kata kunci: Bangladesh; kesuburan; Puntius ticto; Sungai Gangga

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*Pengarang untuk surat-menyurat; email: yeamin2222@yahoo.com

 

 

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