Sains Malaysiana 38(6)(2009): 817–825

Exploring the Use of Empirical Methods to Measure the Secondary Production of Strombus canarium (Gastropoda: Strombidae) Population in Johor Straits, Malaysia

 (Tinjauan Penggunaan Beberapa Kaedah Empirik untuk Mengukur Penghasilan Sekunder bagi Populasi Strombus canarium (Gastropoda: Strombidae) di Selat Johor, Malaysia)

Zaidi Che Cob* & Mazlan Abd. Ghaffar

Marine Ecosystem Research Center (EKOMAR)

School of Environmental and Natural Resource Science, Faculty of Science and Technology

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor D.E., Malaysia

Aziz Arshad & Japar Sidik Bujang

Department of Biology, Faculty of Science

Universiti Putra Malaysia, 43400 UPM Serdang, Selangor D.E., Malaysia

Diserahkan: 13 November 2008 / Diterima: 29 Januari 2009

ABSTRACT

The study was conducted at Merambong Shoal (01^o19.979’N, 103 ^o 35.965’E) in the Sungai Pulai estuary, Johor Straits, Malaysia from January to December 2005. Standing biomass of male and female Strombus canarium sub populations was calculated monthly based on the abundance value of each cohort and on the length-weight relationship. Secondary production was estimated using increment summation method, upon recognition of cohorts following the size-frequency distribution analysis using Bhattacharya and Hasselblad’s NORMSEP methods. Monthly variations in standing biomass (B) and production (P) showed higher values during the wet season compared to dry season, which indicate seasonal variations. Total production (P) was estimated at 0.14 gAFDWm^-2yr^-1 and 0.45 gAFDWm^-2yr^-1, while the annual mean population biomass ( ) was estimated at 0.13 gAFDWm^-2 and 0.26 gAFDWm^-2, for males and females, respectively. The P/  ratio was therefore calculated at 1.08 yr^-1 for male and 1.73 yr^-1 for female, which was within the values reported for other gastropod species. Estimates using empirical methods commonly used in secondary production studies found that none could be applied to the species. Considering the large amount of time, effort and resources involved in the conventional production estimation method, more studies are needed to establish a reliable production estimates for S. canarium, and possibly other gastropod species within the tropical region.

Keywords: Biomass; increment summation method; Merambong Shoal; secondary production; Strombus canarium

ABSTRAK

Kajian ini telah dijalankan di Beting Merambong (01 ^o 19.979’U, 103 ^o35.965’T) yang terletak di kawasan muara Sungai Pulai, Selat Johor, Malaysia, dari Januari hingga Disember 2005. Nilai biomass bagi sub populasi jantan dan betina Strombus canarium telah dikira setiap bulan berdasar kepada nilai kelimpahan setiap kohot, serta hubungan panjang-berat. Penghasilan sekunder dianggar menggunakan kaedah penjumlahan pertambahan, hasil daripada pengenalpastian kohot-kohot melalui analisis taburan saiz-frekuensi menggunakan kaedah Bhattacharya dan kaedah NORMSEP Hasselblad. Variasi bulanan bagi biomass (B) dan penghasilan (P) menunjukkan nilai yang lebih tinggi semasa musim hujan berbanding musim kering, yang menunjukkan wujudnya variasi musiman. Jumlah penghasilan (P) telah dianggarkan pada 0.14 gAFDWm^-2thn^-1 untuk dan 0.45 gAFDWm^-2thn^-1, sementara nilai purata tahunan biomas ( ) telah dianggarkan pada 0.13 gAFDWm^-2 dan 0.26 gAFDWm^-2, masing-masing untuk jantan dan betina. Nisbah P/ seterusnya telah dikira pada 1.08 thn^-1 untuk jantan dan 1.73 thn^-1 untuk betina yang berada di dalam julat nilai-nilai yang dilaporkan untuk gastropod lain. Anggaran-anggaran menggunakan kaedah empirik yang biasa digunakan dalam kajian-kajian penghasilan sekunder mendapati tiada satu pun yang boleh diguna pakai untuk spesies yang dikaji. Mengambil kira sejumlah besar masa, tenaga dan sumber yang terlibat dalam kaedah anggaran penghasilan konvensional, lebih banyak kajian diperlukan untuk memperolehi satu kaedah anggaran penghasilan yang boleh diyakini bagi S. canarium dan kemungkinannya bagi spesies gastropod lain di dalam kawasan tropika.

Kata kunci: Biomas; kaedah penjumlahan pertambahan; Merambong shoal; penghasilan sekunder; Strombus canarium

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*Pengarang untuk surat-menyurat; e-mail: zdcc@ukm.my