Sains Malaysiana 42(9)(2013): 1231–1235

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 09 July to 09 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 145 000; 73 000 and 36 500 ind. ha^-1. The 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 the 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 number of fishes at harvest were 155 633.31±11.5; 84 200±4 and 45 600±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 eksperimen telah dijalankan untuk mengetahui kesan densiti 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 145,000; 73,000 dan 36,500 ind. ha^-1. Suhu air, kelutsinaran, kealkalina jumlah, 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 155,633.31±11.5; 84,200±4 dan 45,600±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 h^a-1) dan T₁ (32.74±6.53 kg ha^-1). Dengan mengambil kira penghasilan bersih antara ketiga-tiga densiti yang diuji, densiti 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