Sains Malaysiana 44(6)(2015): 891–898

Kesan Penggunaan Rumpai Laut sebagai Agen Penapis Semula Jadi dalam Pengkulturan Intensif Rotifer Brachionus plicatilis

(Effect of Seaweeds as Biofilters for Mass Culture of Rotifer Brachionus plicatilis)

A.A.R. RAZAK¹*, C.C. ZAIDI², J. ZAINODDIN³, A.M. MAJID⁴, T. TODA⁵ & B.H.R. OTHMAN⁶

¹Jabatan Biologi, Universiti Teknologi MARA, Kampus Perlis, 02600 Arau, Perlis Indera Kayangan, Malaysia

²Jabatan Sains Laut, Pusat Pengajian Sains Sekitaran dan Sumber Alam

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor Darul Ehsan, Malaysia

³Institut Penyelidikan Perikanan (FRI), Jabatan Perikanan Malaysia

81550 Gelah Patah, Johor Darul Takzim, Malaysia

⁴Bahagian Biologi, Pusat Asasi Sains, Universiti Malaya, 50603 Kuala Lumpur, Malaysia

⁵Department of Environmental Engineering for Symbiosis, Soka University, Tokyo 192-8577

Japan

⁶Institut Oseanografi dan Sekitaran (INOS), Universiti Malaysia Terengganu

21030 Kuala Terengganu, Terengganu Darul Iman, Malaysia

Diserahkan: 6 Februari 2014/Diterima: 19 Januari 2015

ABSTRAK

Penyelidikan ini dijalankan untuk menilai kesan penggunaan tiga spesies rumpai laut iaituUlva sp., Gracilaria sp. danKappaphycus sp. sebagai agen penapis semula jadi untuk menstabilkan pengkulturan rotifer dengan menggunakan petunjuk kaedah kuantitatif iaitu membandingkan nilai pertumbuhan seketika per hari rotifer Brachionus plicatilis. Kadar pertumbuhan seketika per hari rotifer dengan penggunaan Ulva sp. (p<0.01), Gracilaria sp. (p<0.05) dan Kappaphycus sp. (p<0.05) pada berat basah 7 g dalam 10 L air laut menunjukkan kesan yang ketara berbanding kawalan. Bagi kesemua rumpai laut yang diuji, keputusan menunjukkan setelah tercapainya nilai min kadar pertumbuhan seketika per hari rotifer yang tertinggi, penambahan jumlah berat penggunaan rumpai laut memberikan kesan penurunan kepada kadar pertumbuhan seketika rotifer. Keputusan menunjukkan Ulva sp. sesuai digunakan sebagai penapis biologi.

Kata kunci: Brachionus plicatilis; kadar pertumbuhan; kultur; penapis semula jadi; rumpai laut

ABSTRACT

The experiment was conducted to evaluate the potential of three species of seaweed namely Ulva sp., Gracilaria sp. and Kappaphycus sp. as a biofilter in the culture of rotifer Brachionus plicatilis. Instantenous growth rate (μ) of rotifer was used as indicator for the efficiency of these seaweeds as biofilter. The result showed that the utilization of Ulva sp. (p<0.01), Gracilaria sp. (p<0.05) and Kappaphycus sp. (p<0.05), at 7 g in 10 L seawater, produced a significant effect as compared with the control. The results also showed when the highest μ values were obtained, addition of the seaweed into the culture will reduce the effectiveness of the biofilter. The results obtained in this study indicated that Ulva sp. can be used as a biofilter.

Keywords: Biofilter; Brachionus plicatilis; culture; growth rate; seaweed

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*Pengarang untuk surat-menyurat; email: abdulrazak@perlis. uitm.edu.my