Sains Malaysiana 42(11)(2013): 1565–1569

Effects of Stocking Density on Growth Performance and

Production of Mola, Amblypharyngodon mola

(Kesan Ketumpatan Stok dalam Prestasi Pertumbuhan dan Penghasilan Mola

Amblypharyngodon mola)

M. ASADUJJAMAN¹, M.A. WAHAB¹, M.K. FATEMA¹, M. BELAL HOSSAIN^{2 3}* & A.K.M.S. AZAM¹

¹Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, Bangladesh

²Department of Biology, FOS, Universiti Brunei Darussalam, 1413, Brunei

³Fisheries and Marine science, Noakhali Science and Technology University

Bangladesh

Received: 23 October 2012/Accepted: 2 February 2013

ABSTRACT

An experiment was conducted to determine the effects of stocking density on growth performance and production of Amblypharyngodon mola during 9 July to 9 October, 2011. There were three treatments, each with three replications in nine earthen ponds with an average depth of 1.5 m. Ponds of three treatments T1, T2 and T3 were stocked with mola at the density of 145000; 73000 and 36500 ind. ha-1. Water temperature, transparency, total alkalinity, pH, dissolved oxygen, Nitrate-nitrogen, nitrite-nitrogen, ammonia-nitrogen, phosphate-phosphorus and chlorophyll-a of the ponds water were measured weekly. Among water quality parameters, significant differences (p<0.05) were observed in case of temperature and dissolved oxygen. The lowest PO4-P and chlorophyll-a concentration were observed in T1. All water quality parameters were in suitable range of fish culture. The numbers of fishes at harvest were 155633.31±11.5; 84200±4 and 45600±7.21 indi. ha-1 in T1, T2 and T3, respectively. The mean weight of mola during harvest decreased significantly (p<0.05) with increasing stocking density. The net production of mola was significantly higher in treatment T3 (43.22±8.66 kg ha-1) than T2 (34.82±6.53 kg ha-1) and T1 (32.74±6.53 kg ha-1). Considering the highest net production among the three tested densities, the stocking density applied in T3 was found the best.

Keywords: Growth performance; mola; production; stocking density

ABSTRAK

Satu uji kaji telah dijalankan untuk mengetahui kesan ketumpatan stok dalam prestasi pertumbuhan dan penghasilan ikan Amblypharyngodon mola dari 9 Julai hingga 9 Oktober 2011. Tiga perlakuan dengan tiga replikasi setiap satu telah digunakan dalam kolam berdasar tanah dengan kedalaman 1.5 m. Kolam dengan tiga perlakuan T1, T2 dan T3 telah dimasukkan ikan mola pada ketumpatan 145000; 73000 dan 36500 ind. ha-1. Suhu air, kelutsinaran, kealkalinan total, pH, oksigen terlarut, nitrat-nitrogen, nitrit-nitrogen, ammonia-nitrogen, fosfat-fosforus dan klorofil-a pada air kolam diukur setiap minggu. Antara parameter kualiti air tersebut, perbezaan signifikan (p<0.05) diperhatikan pada suhu dan oksigen terlarut. Kepekatan PO4-P dan klorofil-a paling rendah diperhatikan dalam T1. Kesemua parameter kualiti air didapati berada pada julat yang sesuai untuk kultur ikan. Ketumpatan ikan semasa penuaian adalah 155633.31±11.5; 84200±4 dan 45600±7.21 indi. ha-1 dalam T1, T2 dan T3 masing-masing. Berat min ikan mola semasa penuaian telah menurun secara signifikan (p<0.05) dengan peningkatan ketumpatan stok. Penghasilan bersih ikan mola adalah lebih tinggi secara signifikan dalam perlakuan T3 (43.22±8.66 kg ha-1) daripada T2 (34.82±6.53 kg ha-1) dan T1 (32.74±6.53 kg ha-1). Dengan mengambil kira penghasilan bersih antara ketiga-tiga ketumpatan yang diuji, ketumpatan stok yang diperlakukan dalam T3 didapati paling baik.

Kata kunci: Ketumpatan stok; mola; penghasilan; prestasi pertumbuhan

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*Corresponding author; email; mbhnstu@gmail.com