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 Hossain2 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
Diserahkan: 23 Oktober 2012 /Diterima: 2 Februari 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 145000; 73000 and 36500 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 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
145,000; 73,000 dan 36,500 ind. ha-1. Suhu air, kelutsinaran, kealkalina 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. Densiti 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 densiti 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 densiti yang diuji, ketumpatan stok
yang diperlakukan dalam T3 didapati paling baik.
Kata kunci: Ketumpatan stok; mola; penghasilan; prestasi
pertumbuhan
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*Pengarang
untuk surat menyurat; email: mbhnstu@gmail.com
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